{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2024-49946", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.044Z", "datePublished": "2024-10-21T18:02:03.779Z", "dateUpdated": "2024-12-19T09:29:52.931Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-12-19T09:29:52.931Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp: do not assume bh is held in ppp_channel_bridge_input()\n\nNetworking receive path is usually handled from BH handler.\nHowever, some protocols need to acquire the socket lock, and\npackets might be stored in the socket backlog is the socket was\nowned by a user process.\n\nIn this case, release_sock(), __release_sock(), and sk_backlog_rcv()\nmight call the sk->sk_backlog_rcv() handler in process context.\n\nsybot caught ppp was not considering this case in\nppp_channel_bridge_input() :\n\nWARNING: inconsistent lock state\n6.11.0-rc7-syzkaller-g5f5673607153 #0 Not tainted\n--------------------------------\ninconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.\nksoftirqd/1/24 [HC0[0]:SC1[1]:HE1:SE0] takes:\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\n{SOFTIRQ-ON-W} state was registered at:\n lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759\n __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]\n _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154\n spin_lock include/linux/spinlock.h:351 [inline]\n ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\n ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\n pppoe_rcv_core+0xfc/0x314 drivers/net/ppp/pppoe.c:379\n sk_backlog_rcv include/net/sock.h:1111 [inline]\n __release_sock+0x1a8/0x3d8 net/core/sock.c:3004\n release_sock+0x68/0x1b8 net/core/sock.c:3558\n pppoe_sendmsg+0xc8/0x5d8 drivers/net/ppp/pppoe.c:903\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg net/socket.c:745 [inline]\n __sys_sendto+0x374/0x4f4 net/socket.c:2204\n __do_sys_sendto net/socket.c:2216 [inline]\n __se_sys_sendto net/socket.c:2212 [inline]\n __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2212\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49\n el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151\n el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712\n el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\n el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\nirq event stamp: 282914\n hardirqs last enabled at (282914): [<ffff80008b42e30c>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]\n hardirqs last enabled at (282914): [<ffff80008b42e30c>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194\n hardirqs last disabled at (282913): [<ffff80008b42e13c>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]\n hardirqs last disabled at (282913): [<ffff80008b42e13c>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162\n softirqs last enabled at (282904): [<ffff8000801f8e88>] softirq_handle_end kernel/softirq.c:400 [inline]\n softirqs last enabled at (282904): [<ffff8000801f8e88>] handle_softirqs+0xa3c/0xbfc kernel/softirq.c:582\n softirqs last disabled at (282909): [<ffff8000801fbdf8>] run_ksoftirqd+0x70/0x158 kernel/softirq.c:928\n\nother info that might help us debug this:\n Possible unsafe locking scenario:\n\n CPU0\n ----\n lock(&pch->downl);\n <Interrupt>\n lock(&pch->downl);\n\n *** DEADLOCK ***\n\n1 lock held by ksoftirqd/1/24:\n #0: ffff80008f74dfa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:325\n\nstack backtrace:\nCPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.11.0-rc7-syzkaller-g5f5673607153 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nCall trace:\n dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319\n show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326\n __dump_sta\n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ppp/ppp_generic.c"], "versions": [{"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "176dd41e8c2bd997ed3d66568a3362e69ecce99b", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "635deca1800a68624f185dc1e04a8495b48cf185", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "f9620e2a665aa642625bd2501282bbddff556bd7", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "efe9cc0f7c0279216a5522271ec675b8288602e4", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "c837f8583535f094a39386308c2ccfd92c8596cd", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d7f12df30a68e833b263e7a2202d1", "lessThan": "aec7291003df78cb71fd461d7b672912bde55807", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ppp/ppp_generic.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.55", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.14", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.3", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/176dd41e8c2bd997ed3d66568a3362e69ecce99b"}, {"url": "https://git.kernel.org/stable/c/635deca1800a68624f185dc1e04a8495b48cf185"}, {"url": "https://git.kernel.org/stable/c/f9620e2a665aa642625bd2501282bbddff556bd7"}, {"url": "https://git.kernel.org/stable/c/efe9cc0f7c0279216a5522271ec675b8288602e4"}, {"url": "https://git.kernel.org/stable/c/c837f8583535f094a39386308c2ccfd92c8596cd"}, {"url": "https://git.kernel.org/stable/c/aec7291003df78cb71fd461d7b672912bde55807"}], "title": "ppp: do not assume bh is held in ppp_channel_bridge_input()", "x_generator": {"engine": "bippy-5f407fcff5a0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-49946", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:37:03.573119Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:38:49.783Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2024-49946", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T12:17:06.044Z", "datePublished": "2024-10-21T18:02:03.779Z", "dateUpdated": "2024-10-21T18:02:03.779Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-10-21T18:02:03.779Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp: do not assume bh is held in ppp_channel_bridge_input()\n\nNetworking receive path is usually handled from BH handler.\nHowever, some protocols need to acquire the socket lock, and\npackets might be stored in the socket backlog is the socket was\nowned by a user process.\n\nIn this case, release_sock(), __release_sock(), and sk_backlog_rcv()\nmight call the sk->sk_backlog_rcv() handler in process context.\n\nsybot caught ppp was not considering this case in\nppp_channel_bridge_input() :\n\nWARNING: inconsistent lock state\n6.11.0-rc7-syzkaller-g5f5673607153 #0 Not tainted\n--------------------------------\ninconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.\nksoftirqd/1/24 [HC0[0]:SC1[1]:HE1:SE0] takes:\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\n{SOFTIRQ-ON-W} state was registered at:\n lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759\n __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]\n _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154\n spin_lock include/linux/spinlock.h:351 [inline]\n ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\n ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\n pppoe_rcv_core+0xfc/0x314 drivers/net/ppp/pppoe.c:379\n sk_backlog_rcv include/net/sock.h:1111 [inline]\n __release_sock+0x1a8/0x3d8 net/core/sock.c:3004\n release_sock+0x68/0x1b8 net/core/sock.c:3558\n pppoe_sendmsg+0xc8/0x5d8 drivers/net/ppp/pppoe.c:903\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg net/socket.c:745 [inline]\n __sys_sendto+0x374/0x4f4 net/socket.c:2204\n __do_sys_sendto net/socket.c:2216 [inline]\n __se_sys_sendto net/socket.c:2212 [inline]\n __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2212\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49\n el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151\n el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712\n el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\n el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\nirq event stamp: 282914\n hardirqs last enabled at (282914): [<ffff80008b42e30c>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]\n hardirqs last enabled at (282914): [<ffff80008b42e30c>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194\n hardirqs last disabled at (282913): [<ffff80008b42e13c>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]\n hardirqs last disabled at (282913): [<ffff80008b42e13c>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162\n softirqs last enabled at (282904): [<ffff8000801f8e88>] softirq_handle_end kernel/softirq.c:400 [inline]\n softirqs last enabled at (282904): [<ffff8000801f8e88>] handle_softirqs+0xa3c/0xbfc kernel/softirq.c:582\n softirqs last disabled at (282909): [<ffff8000801fbdf8>] run_ksoftirqd+0x70/0x158 kernel/softirq.c:928\n\nother info that might help us debug this:\n Possible unsafe locking scenario:\n\n CPU0\n ----\n lock(&pch->downl);\n <Interrupt>\n lock(&pch->downl);\n\n *** DEADLOCK ***\n\n1 lock held by ksoftirqd/1/24:\n #0: ffff80008f74dfa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:325\n\nstack backtrace:\nCPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.11.0-rc7-syzkaller-g5f5673607153 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nCall trace:\n dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319\n show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326\n __dump_sta\n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ppp/ppp_generic.c"], "versions": [{"version": "4cf476ced45d", "lessThan": "176dd41e8c2b", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d", "lessThan": "635deca1800a", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d", "lessThan": "f9620e2a665a", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d", "lessThan": "efe9cc0f7c02", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d", "lessThan": "c837f8583535", "status": "affected", "versionType": "git"}, {"version": "4cf476ced45d", "lessThan": "aec7291003df", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ppp/ppp_generic.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "custom"}, {"version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom"}, {"version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "custom"}, {"version": "6.6.55", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "custom"}, {"version": "6.10.14", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "custom"}, {"version": "6.11.3", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "custom"}, {"version": "6.12-rc2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/176dd41e8c2bd997ed3d66568a3362e69ecce99b"}, {"url": "https://git.kernel.org/stable/c/635deca1800a68624f185dc1e04a8495b48cf185"}, {"url": "https://git.kernel.org/stable/c/f9620e2a665aa642625bd2501282bbddff556bd7"}, {"url": "https://git.kernel.org/stable/c/efe9cc0f7c0279216a5522271ec675b8288602e4"}, {"url": "https://git.kernel.org/stable/c/c837f8583535f094a39386308c2ccfd92c8596cd"}, {"url": "https://git.kernel.org/stable/c/aec7291003df78cb71fd461d7b672912bde55807"}], "title": "ppp: do not assume bh is held in ppp_channel_bridge_input()", "x_generator": {"engine": "bippy-c9c4e1df01b2"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-49946", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:37:03.573119Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2024-10-22T13:37:07.068Z"}, "title": "CISA ADP Vulnrichment"}]}}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4D51C05D-455B-4D8D-89E7-A58E140B864C", "versionEndExcluding": "5.15.168", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D01BD22E-ACD1-4618-9D01-6116570BE1EE", "versionEndExcluding": "6.1.113", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E90B9576-56C4-47BC-AAB0-C5B2D438F5D0", "versionEndExcluding": "6.6.55", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4C16BCE0-FFA0-4599-BE0A-1FD65101C021", "versionEndExcluding": "6.10.14", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "54D9C704-D679-41A7-9C40-10A6B1E7FFE9", "versionEndExcluding": "6.11.3", "versionStartIncluding": "6.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*", "matchCriteriaId": "7F361E1D-580F-4A2D-A509-7615F73167A1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp: do not assume bh is held in ppp_channel_bridge_input()\n\nNetworking receive path is usually handled from BH handler.\nHowever, some protocols need to acquire the socket lock, and\npackets might be stored in the socket backlog is the socket was\nowned by a user process.\n\nIn this case, release_sock(), __release_sock(), and sk_backlog_rcv()\nmight call the sk->sk_backlog_rcv() handler in process context.\n\nsybot caught ppp was not considering this case in\nppp_channel_bridge_input() :\n\nWARNING: inconsistent lock state\n6.11.0-rc7-syzkaller-g5f5673607153 #0 Not tainted\n--------------------------------\ninconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.\nksoftirqd/1/24 [HC0[0]:SC1[1]:HE1:SE0] takes:\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\n ffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\n{SOFTIRQ-ON-W} state was registered at:\n lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759\n __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]\n _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154\n spin_lock include/linux/spinlock.h:351 [inline]\n ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\n ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\n pppoe_rcv_core+0xfc/0x314 drivers/net/ppp/pppoe.c:379\n sk_backlog_rcv include/net/sock.h:1111 [inline]\n __release_sock+0x1a8/0x3d8 net/core/sock.c:3004\n release_sock+0x68/0x1b8 net/core/sock.c:3558\n pppoe_sendmsg+0xc8/0x5d8 drivers/net/ppp/pppoe.c:903\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg net/socket.c:745 [inline]\n __sys_sendto+0x374/0x4f4 net/socket.c:2204\n __do_sys_sendto net/socket.c:2216 [inline]\n __se_sys_sendto net/socket.c:2212 [inline]\n __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2212\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49\n el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151\n el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712\n el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\n el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\nirq event stamp: 282914\n hardirqs last enabled at (282914): [<ffff80008b42e30c>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]\n hardirqs last enabled at (282914): [<ffff80008b42e30c>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194\n hardirqs last disabled at (282913): [<ffff80008b42e13c>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]\n hardirqs last disabled at (282913): [<ffff80008b42e13c>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162\n softirqs last enabled at (282904): [<ffff8000801f8e88>] softirq_handle_end kernel/softirq.c:400 [inline]\n softirqs last enabled at (282904): [<ffff8000801f8e88>] handle_softirqs+0xa3c/0xbfc kernel/softirq.c:582\n softirqs last disabled at (282909): [<ffff8000801fbdf8>] run_ksoftirqd+0x70/0x158 kernel/softirq.c:928\n\nother info that might help us debug this:\n Possible unsafe locking scenario:\n\n CPU0\n ----\n lock(&pch->downl);\n <Interrupt>\n lock(&pch->downl);\n\n *** DEADLOCK ***\n\n1 lock held by ksoftirqd/1/24:\n #0: ffff80008f74dfa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:325\n\nstack backtrace:\nCPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.11.0-rc7-syzkaller-g5f5673607153 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nCall trace:\n dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319\n show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326\n __dump_sta\n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ppp: no asuma que bh se mantiene en ppp_channel_bridge_input() La ruta de recepci\u00f3n de red generalmente se maneja desde el controlador BH. Sin embargo, algunos protocolos necesitan adquirir el bloqueo del socket y los paquetes pueden almacenarse en el backlog del socket si el socket era propiedad de un proceso de usuario. En este caso, release_sock(), __release_sock() y sk_backlog_rcv() pueden llamar al controlador sk-&gt;sk_backlog_rcv() en el contexto del proceso. sybot captur\u00f3 que ppp no estaba considerando este caso en ppp_channel_bridge_input(): ADVERTENCIA: estado de bloqueo inconsistente 6.11.0-rc7-syzkaller-g5f5673607153 #0 No contaminado -------------------------------- uso inconsistente de {SOFTIRQ-ON-W} -&gt; {IN-SOFTIRQ-W}. ksoftirqd/1/24 [HC0[0]:SC1[1]:HE1:SE0] toma: ffff0000db7f11e0 (&amp;pch-&gt;downl){+.?.}-{2:2}, en: spin_lock include/linux/spinlock.h:351 [en l\u00ednea] ffff0000db7f11e0 (&amp;pch-&gt;downl){+.?.}-{2:2}, en: ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [en l\u00ednea] ffff0000db7f11e0 (&amp;pch-&gt;downl){+.?.}-{2:2}, en: ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304 El estado {SOFTIRQ-ON-W} se registr\u00f3 en: lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [en l\u00ednea] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [en l\u00ednea] ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [en l\u00ednea] ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304 pppoe_rcv_core+0xfc/0x314 drivers/net/ppp/pppoe.c:379 sk_backlog_rcv incluir/net/sock.h:1111 [en l\u00ednea] __release_sock+0x1a8/0x3d8 net/core/sock.c:3004 release_sock+0x68/0x1b8 net/core/sock.c:3558 pppoe_sendmsg+0xc8/0x5d8 drivers/net/ppp/pppoe.c:903 sock_sendmsg_nosec net/socket.c:730 [en l\u00ednea] __sock_sendmsg net/socket.c:745 [en l\u00ednea] __sys_sendto+0x374/0x4f4 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [en l\u00ednea] __se_sys_sendto net/socket.c:2212 [en l\u00ednea] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2212 __invoke_syscall arch/arm64/kernel/syscall.c:35 [en l\u00ednea] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 marca de evento de irq: 282914 hardirqs habilitados por \u00faltima vez en (282914): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [en l\u00ednea] hardirqs habilitados por \u00faltima vez en (282914): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs deshabilitados por \u00faltima vez en (282913): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [en l\u00ednea] hardirqs se desactiv\u00f3 por \u00faltima vez en (282913): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs se activ\u00f3 por \u00faltima vez en (282904): [] softirq_handle_end kernel/softirq.c:400 [en l\u00ednea] softirqs se activ\u00f3 por \u00faltima vez en (282904): [] handle_softirqs+0xa3c/0xbfc kernel/softirq.c:582 softirqs se desactiv\u00f3 por \u00faltima vez en (282909): [] run_ksoftirqd+0x70/0x158 kernel/softirq.c:928 otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: Posible escenario de bloqueo inseguro: CPU0 ---- lock(&amp;pch-&gt;downl); lock(&amp;pch-&gt;downl); *** BLOQUEO INTERMEDIO *** 1 bloqueo mantenido por ksoftirqd/1/24: #0: ffff80008f74dfa0 (rcu_read_lock){....}-{1:2}, en: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:325 seguimiento de pila: CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 No contaminado 6.11.0-rc7-syzkaller-g5f5673607153 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Seguimiento de llamadas: dump_backtrace+0x1b8/0x1e4 arch/ar---truncado---"}], "id": "CVE-2024-49946", "lastModified": "2024-11-12T21:37:03.203", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-10-21T18:15:16.133", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/176dd41e8c2bd997ed3d66568a3362e69ecce99b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/635deca1800a68624f185dc1e04a8495b48cf185"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aec7291003df78cb71fd461d7b672912bde55807"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c837f8583535f094a39386308c2ccfd92c8596cd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/efe9cc0f7c0279216a5522271ec675b8288602e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9620e2a665aa642625bd2501282bbddff556bd7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ppp: do not assume bh is held in ppp_channel_bridge_input()", "id": "2320471", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320471"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-667", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nppp: do not assume bh is held in ppp_channel_bridge_input()\nNetworking receive path is usually handled from BH handler.\nHowever, some protocols need to acquire the socket lock, and\npackets might be stored in the socket backlog is the socket was\nowned by a user process.\nIn this case, release_sock(), __release_sock(), and sk_backlog_rcv()\nmight call the sk->sk_backlog_rcv() handler in process context.\nsybot caught ppp was not considering this case in\nppp_channel_bridge_input() :\nWARNING: inconsistent lock state\n6.11.0-rc7-syzkaller-g5f5673607153 #0 Not tainted\n--------------------------------\ninconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.\nksoftirqd/1/24 [HC0[0]:SC1[1]:HE1:SE0] takes:\nffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]\nffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\nffff0000db7f11e0 (&pch->downl){+.?.}-{2:2}, at: ppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\n{SOFTIRQ-ON-W} state was registered at:\nlock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759\n__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]\n_raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154\nspin_lock include/linux/spinlock.h:351 [inline]\nppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2272 [inline]\nppp_input+0x16c/0x854 drivers/net/ppp/ppp_generic.c:2304\npppoe_rcv_core+0xfc/0x314 drivers/net/ppp/pppoe.c:379\nsk_backlog_rcv include/net/sock.h:1111 [inline]\n__release_sock+0x1a8/0x3d8 net/core/sock.c:3004\nrelease_sock+0x68/0x1b8 net/core/sock.c:3558\npppoe_sendmsg+0xc8/0x5d8 drivers/net/ppp/pppoe.c:903\nsock_sendmsg_nosec net/socket.c:730 [inline]\n__sock_sendmsg net/socket.c:745 [inline]\n__sys_sendto+0x374/0x4f4 net/socket.c:2204\n__do_sys_sendto net/socket.c:2216 [inline]\n__se_sys_sendto net/socket.c:2212 [inline]\n__arm64_sys_sendto+0xd8/0xf8 net/socket.c:2212\n__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\ninvoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49\nel0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132\ndo_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151\nel0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712\nel0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\nel0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\nirq event stamp: 282914\nhardirqs last enabled at (282914): [<ffff80008b42e30c>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]\nhardirqs last enabled at (282914): [<ffff80008b42e30c>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194\nhardirqs last disabled at (282913): [<ffff80008b42e13c>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]\nhardirqs last disabled at (282913): [<ffff80008b42e13c>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162\nsoftirqs last enabled at (282904): [<ffff8000801f8e88>] softirq_handle_end kernel/softirq.c:400 [inline]\nsoftirqs last enabled at (282904): [<ffff8000801f8e88>] handle_softirqs+0xa3c/0xbfc kernel/softirq.c:582\nsoftirqs last disabled at (282909): [<ffff8000801fbdf8>] run_ksoftirqd+0x70/0x158 kernel/softirq.c:928\nother info that might help us debug this:\nPossible unsafe locking scenario:\nCPU0\n----\nlock(&pch->downl);\n<Interrupt>\nlock(&pch->downl);\n*** DEADLOCK ***\n1 lock held by ksoftirqd/1/24:\n#0: ffff80008f74dfa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:325\nstack backtrace:\nCPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.11.0-rc7-syzkaller-g5f5673607153 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024\nCall trace:\ndump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319\nshow_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326\n__dump_sta\n---truncated---"], "name": "CVE-2024-49946", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-49946\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-49946\nhttps://lore.kernel.org/linux-cve-announce/2024102129-CVE-2024-49946-762f@gregkh/T"], "threat_severity": "Moderate"}