CVE-2021-47572

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47572", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-24T15:11:00.729Z", "datePublished": "2024-05-24T15:12:58.397Z", "dateUpdated": "2026-05-11T13:57:13.134Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T13:57:13.134Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nexthop: fix null pointer dereference when IPv6 is not enabled\n\nWhen we try to add an IPv6 nexthop and IPv6 is not enabled\n(!CONFIG_IPV6) we'll hit a NULL pointer dereference[1] in the error path\nof nh_create_ipv6() due to calling ipv6_stub->fib6_nh_release. The bug\nhas been present since the beginning of IPv6 nexthop gateway support.\nCommit 1aefd3de7bc6 (\"ipv6: Add fib6_nh_init and release to stubs\") tells\nus that only fib6_nh_init has a dummy stub because fib6_nh_release should\nnot be called if fib6_nh_init returns an error, but the commit below added\na call to ipv6_stub->fib6_nh_release in its error path. To fix it return\nthe dummy stub's -EAFNOSUPPORT error directly without calling\nipv6_stub->fib6_nh_release in nh_create_ipv6()'s error path.\n\n[1]\n Output is a bit truncated, but it clearly shows the error.\n BUG: kernel NULL pointer dereference, address: 000000000000000000\n #PF: supervisor instruction fetch in kernel modede\n #PF: error_code(0x0010) - not-present pagege\n PGD 0 P4D 0\n Oops: 0010 [#1] PREEMPT SMP NOPTI\n CPU: 4 PID: 638 Comm: ip Kdump: loaded Not tainted 5.16.0-rc1+ #446\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014\n RIP: 0010:0x0\n Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\n RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac\n RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881008a2860\n RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 0000000000000000\n R10: ffff888109f5b978 R11: ffff888109f5b948 R12: 00000000ffffff9f\n R13: ffff8881008a2a80 R14: ffff8881008a2860 R15: ffff8881008a2840\n FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0\n Call Trace:\n <TASK>\n nh_create_ipv6+0xed/0x10c\n rtm_new_nexthop+0x6d7/0x13f3\n ? check_preemption_disabled+0x3d/0xf2\n ? lock_is_held_type+0xbe/0xfd\n rtnetlink_rcv_msg+0x23f/0x26a\n ? check_preemption_disabled+0x3d/0xf2\n ? rtnl_calcit.isra.0+0x147/0x147\n netlink_rcv_skb+0x61/0xb2\n netlink_unicast+0x100/0x187\n netlink_sendmsg+0x37f/0x3a0\n ? netlink_unicast+0x187/0x187\n sock_sendmsg_nosec+0x67/0x9b\n ____sys_sendmsg+0x19d/0x1f9\n ? copy_msghdr_from_user+0x4c/0x5e\n ? rcu_read_lock_any_held+0x2a/0x78\n ___sys_sendmsg+0x6c/0x8c\n ? asm_sysvec_apic_timer_interrupt+0x12/0x20\n ? lockdep_hardirqs_on+0xd9/0x102\n ? sockfd_lookup_light+0x69/0x99\n __sys_sendmsg+0x50/0x6e\n do_syscall_64+0xcb/0xf2\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f98dea28914\n Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53\n RSP: 002b:00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e\n RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914\n RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003\n RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008\n R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000000001\n R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0\n </TASK>\n Modules linked in: bridge stp llc bonding virtio_net"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/nexthop.c"], "versions": [{"version": "53010f991a9f5e4ed2db705ddde6ff32709192a2", "lessThan": "7b6f44856da5ba0b1aa61403eb9fddd272156503", "status": "affected", "versionType": "git"}, {"version": "53010f991a9f5e4ed2db705ddde6ff32709192a2", "lessThan": "b70ff391deeec35cdd8a05f5f63f5fe28bc4f225", "status": "affected", "versionType": "git"}, {"version": "53010f991a9f5e4ed2db705ddde6ff32709192a2", "lessThan": "39509d76a9a3d02f379d52cb4b1449469c56c0e0", "status": "affected", "versionType": "git"}, {"version": "53010f991a9f5e4ed2db705ddde6ff32709192a2", "lessThan": "1c743127cc54b112b155f434756bd4b5fa565a99", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/nexthop.c"], "versions": [{"version": "5.3", "status": "affected"}, {"version": "0", "lessThan": "5.3", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.163", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.83", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.6", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.4.163"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.10.83"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.15.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7b6f44856da5ba0b1aa61403eb9fddd272156503"}, {"url": "https://git.kernel.org/stable/c/b70ff391deeec35cdd8a05f5f63f5fe28bc4f225"}, {"url": "https://git.kernel.org/stable/c/39509d76a9a3d02f379d52cb4b1449469c56c0e0"}, {"url": "https://git.kernel.org/stable/c/1c743127cc54b112b155f434756bd4b5fa565a99"}], "title": "net: nexthop: fix null pointer dereference when IPv6 is not enabled", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.779Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/7b6f44856da5ba0b1aa61403eb9fddd272156503", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/b70ff391deeec35cdd8a05f5f63f5fe28bc4f225", "tags": ["x_transferred"]}, {"url": 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The bug\nhas been present since the beginning of IPv6 nexthop gateway support.\nCommit 1aefd3de7bc6 (\"ipv6: Add fib6_nh_init and release to stubs\") tells\nus that only fib6_nh_init has a dummy stub because fib6_nh_release should\nnot be called if fib6_nh_init returns an error, but the commit below added\na call to ipv6_stub->fib6_nh_release in its error path. To fix it return\nthe dummy stub's -EAFNOSUPPORT error directly without calling\nipv6_stub->fib6_nh_release in nh_create_ipv6()'s error path.\n\n[1]\n Output is a bit truncated, but it clearly shows the error.\n BUG: kernel NULL pointer dereference, address: 000000000000000000\n #PF: supervisor instruction fetch in kernel modede\n #PF: error_code(0x0010) - not-present pagege\n PGD 0 P4D 0\n Oops: 0010 [#1] PREEMPT SMP NOPTI\n CPU: 4 PID: 638 Comm: ip Kdump: loaded Not tainted 5.16.0-rc1+ #446\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014\n RIP: 0010:0x0\n Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\n RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac\n RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881008a2860\n RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 0000000000000000\n R10: ffff888109f5b978 R11: ffff888109f5b948 R12: 00000000ffffff9f\n R13: ffff8881008a2a80 R14: ffff8881008a2860 R15: ffff8881008a2840\n FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0\n Call Trace:\n <TASK>\n nh_create_ipv6+0xed/0x10c\n rtm_new_nexthop+0x6d7/0x13f3\n ? check_preemption_disabled+0x3d/0xf2\n ? lock_is_held_type+0xbe/0xfd\n rtnetlink_rcv_msg+0x23f/0x26a\n ? check_preemption_disabled+0x3d/0xf2\n ? rtnl_calcit.isra.0+0x147/0x147\n netlink_rcv_skb+0x61/0xb2\n netlink_unicast+0x100/0x187\n netlink_sendmsg+0x37f/0x3a0\n ? netlink_unicast+0x187/0x187\n sock_sendmsg_nosec+0x67/0x9b\n ____sys_sendmsg+0x19d/0x1f9\n ? copy_msghdr_from_user+0x4c/0x5e\n ? rcu_read_lock_any_held+0x2a/0x78\n ___sys_sendmsg+0x6c/0x8c\n ? asm_sysvec_apic_timer_interrupt+0x12/0x20\n ? lockdep_hardirqs_on+0xd9/0x102\n ? sockfd_lookup_light+0x69/0x99\n __sys_sendmsg+0x50/0x6e\n do_syscall_64+0xcb/0xf2\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f98dea28914\n Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53\n RSP: 002b:00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e\n RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914\n RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003\n RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008\n R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000000001\n R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0\n </TASK>\n Modules linked in: bridge stp llc bonding virtio_net"}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-11-04T12:08:28.404Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47572", "state": "PUBLISHED", "dateUpdated": "2024-11-04T12:08:28.404Z", "dateReserved": "2024-05-24T15:11:00.729Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-24T15:12:58.397Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv4/nexthop.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7b6f44856da5ba0b1aa61403eb9fddd272156503", "status": "affected", "version": "53010f991a9f5e4ed2db705ddde6ff32709192a2", "versionType": "git"}, {"lessThan": "b70ff391deeec35cdd8a05f5f63f5fe28bc4f225", "status": "affected", "version": "53010f991a9f5e4ed2db705ddde6ff32709192a2", "versionType": "git"}, {"lessThan": "39509d76a9a3d02f379d52cb4b1449469c56c0e0", "status": "affected", "version": "53010f991a9f5e4ed2db705ddde6ff32709192a2", "versionType": "git"}, {"lessThan": "1c743127cc54b112b155f434756bd4b5fa565a99", "status": "affected", "version": "53010f991a9f5e4ed2db705ddde6ff32709192a2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv4/nexthop.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.3"}, {"lessThan": "5.3", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.163", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.83", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.16", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "755F3E83-05A5-403D-A6B2-ED9DE8B0F69B", "versionEndExcluding": "5.4.163", "versionStartIncluding": "5.3", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D4843826-EA9A-472B-82EC-B9E4FD4149AD", "versionEndExcluding": "5.10.83", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "990C08FB-0121-4296-896F-556312F8FF3B", "versionEndExcluding": "5.15.6", "versionStartIncluding": "5.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nexthop: fix null pointer dereference when IPv6 is not enabled\n\nWhen we try to add an IPv6 nexthop and IPv6 is not enabled\n(!CONFIG_IPV6) we'll hit a NULL pointer dereference[1] in the error path\nof nh_create_ipv6() due to calling ipv6_stub->fib6_nh_release. The bug\nhas been present since the beginning of IPv6 nexthop gateway support.\nCommit 1aefd3de7bc6 (\"ipv6: Add fib6_nh_init and release to stubs\") tells\nus that only fib6_nh_init has a dummy stub because fib6_nh_release should\nnot be called if fib6_nh_init returns an error, but the commit below added\na call to ipv6_stub->fib6_nh_release in its error path. To fix it return\nthe dummy stub's -EAFNOSUPPORT error directly without calling\nipv6_stub->fib6_nh_release in nh_create_ipv6()'s error path.\n\n[1]\n Output is a bit truncated, but it clearly shows the error.\n BUG: kernel NULL pointer dereference, address: 000000000000000000\n #PF: supervisor instruction fetch in kernel modede\n #PF: error_code(0x0010) - not-present pagege\n PGD 0 P4D 0\n Oops: 0010 [#1] PREEMPT SMP NOPTI\n CPU: 4 PID: 638 Comm: ip Kdump: loaded Not tainted 5.16.0-rc1+ #446\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014\n RIP: 0010:0x0\n Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\n RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac\n RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881008a2860\n RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 0000000000000000\n R10: ffff888109f5b978 R11: ffff888109f5b948 R12: 00000000ffffff9f\n R13: ffff8881008a2a80 R14: ffff8881008a2860 R15: ffff8881008a2840\n FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0\n Call Trace:\n <TASK>\n nh_create_ipv6+0xed/0x10c\n rtm_new_nexthop+0x6d7/0x13f3\n ? check_preemption_disabled+0x3d/0xf2\n ? lock_is_held_type+0xbe/0xfd\n rtnetlink_rcv_msg+0x23f/0x26a\n ? check_preemption_disabled+0x3d/0xf2\n ? rtnl_calcit.isra.0+0x147/0x147\n netlink_rcv_skb+0x61/0xb2\n netlink_unicast+0x100/0x187\n netlink_sendmsg+0x37f/0x3a0\n ? netlink_unicast+0x187/0x187\n sock_sendmsg_nosec+0x67/0x9b\n ____sys_sendmsg+0x19d/0x1f9\n ? copy_msghdr_from_user+0x4c/0x5e\n ? rcu_read_lock_any_held+0x2a/0x78\n ___sys_sendmsg+0x6c/0x8c\n ? asm_sysvec_apic_timer_interrupt+0x12/0x20\n ? lockdep_hardirqs_on+0xd9/0x102\n ? sockfd_lookup_light+0x69/0x99\n __sys_sendmsg+0x50/0x6e\n do_syscall_64+0xcb/0xf2\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f98dea28914\n Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53\n RSP: 002b:00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e\n RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914\n RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003\n RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008\n R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000000001\n R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0\n </TASK>\n Modules linked in: bridge stp llc bonding virtio_net"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: nexthop: corrige la desreferencia del puntero nulo cuando IPv6 no est\u00e1 habilitado Cuando intentamos agregar un nexthop IPv6 y IPv6 no est\u00e1 habilitado (!CONFIG_IPV6) alcanzaremos una desreferencia del puntero NULL [1] en la ruta de error de nh_create_ipv6() debido a la llamada a ipv6_stub-&gt;fib6_nh_release. El error ha estado presente desde el comienzo del soporte de la puerta de enlace IPv6 nexthop. El commit 1aefd3de7bc6 (\"ipv6: Agregar fib6_nh_init y liberar a los stubs\") nos dice que solo fib6_nh_init tiene un stub ficticio porque no se debe llamar a fib6_nh_release si fib6_nh_init devuelve un error, pero el commit a continuaci\u00f3n agreg\u00f3 una llamada a ipv6_stub-&gt;fib6_nh_release en su error camino. Para solucionarlo, devuelva el error -EAFNOSUPPORT del c\u00f3digo auxiliar ficticio directamente sin llamar a ipv6_stub-&gt;fib6_nh_release en la ruta de error de nh_create_ipv6(). [1] La salida est\u00e1 un poco truncada, pero muestra claramente el error. ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000000000 #PF: b\u00fasqueda de instrucciones del supervisor en modo kernel #PF: c\u00f3digo_error(0x0010) - p\u00e1gina no presente PGD 0 P4D 0 Ups: 0010 [#1] PREEMPT SMP NOPTI CPU: 4 PID: 638 Comm: ip Kdump: cargado No contaminado 5.16.0-rc1+ #446 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 01/04/2014 RIP: 0010:0x0 C\u00f3digo: No se puede acceder a los bytes del c\u00f3digo de operaci\u00f3n en RIP 0xffffffffffffffd6. RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 00000000000000000 RDX: 0000000000000000 RSI: 000000000000000 RDI: ffff8881008a2860 RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 00000000000000000 R10: ffff888109f5b978 R11: 9f5b948 R12: 00000000ffffff9f R13: ffff8881008a2a80 R14 : ffff8881008a2860 R15: ffff8881008a2840 FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0 Seguimiento de llamadas: nh_create_ipv6+0xed /0x10c rtm_new_nexthop+0x6d7/0x13f3 ? check_preemption_disabled+0x3d/0xf2? lock_is_held_type+0xbe/0xfd rtnetlink_rcv_msg+0x23f/0x26a? check_preemption_disabled+0x3d/0xf2? rtnl_calcit.isra.0+0x147/0x147 netlink_rcv_skb+0x61/0xb2 netlink_unicast+0x100/0x187 netlink_sendmsg+0x37f/0x3a0 ? netlink_unicast+0x187/0x187 sock_sendmsg_nosec+0x67/0x9b ____sys_sendmsg+0x19d/0x1f9 ? copy_msghdr_from_user+0x4c/0x5e? rcu_read_lock_any_held+0x2a/0x78 ___sys_sendmsg+0x6c/0x8c? asm_sysvec_apic_timer_interrupt+0x12/0x20? lockdep_hardirqs_on+0xd9/0x102? sockfd_lookup_light+0x69/0x99 __sys_sendmsg+0x50/0x6e do_syscall_64+0xcb/0xf2 Entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f98dea28914 C\u00f3digo: 00 f7 d8 64 89 02 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 &lt;48&gt; 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53 RSP: :00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914 RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008 R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000001 R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0 &lt; /TASK&gt; M\u00f3dulos vinculados en: bridge stp llc bonding virtio_net"}], "id": "CVE-2021-47572", "lastModified": "2026-06-17T04:17:47.710", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47572", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:35:07.855330Z", "version": "2.0.3"}}]}, "published": "2024-05-24T15:15:22.887", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1c743127cc54b112b155f434756bd4b5fa565a99"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39509d76a9a3d02f379d52cb4b1449469c56c0e0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7b6f44856da5ba0b1aa61403eb9fddd272156503"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b70ff391deeec35cdd8a05f5f63f5fe28bc4f225"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1c743127cc54b112b155f434756bd4b5fa565a99"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39509d76a9a3d02f379d52cb4b1449469c56c0e0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7b6f44856da5ba0b1aa61403eb9fddd272156503"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b70ff391deeec35cdd8a05f5f63f5fe28bc4f225"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2022:8267", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}, {"advisory": "RHSA-2022:8267", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}], "bugzilla": {"description": "kernel: net: nexthop: fix null pointer dereference when IPv6 is not enabled", "id": "2283457", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2283457"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: nexthop: fix null pointer dereference when IPv6 is not enabled\nWhen we try to add an IPv6 nexthop and IPv6 is not enabled\n(!CONFIG_IPV6) we'll hit a NULL pointer dereference[1] in the error path\nof nh_create_ipv6() due to calling ipv6_stub->fib6_nh_release. The bug\nhas been present since the beginning of IPv6 nexthop gateway support.\nCommit 1aefd3de7bc6 (\"ipv6: Add fib6_nh_init and release to stubs\") tells\nus that only fib6_nh_init has a dummy stub because fib6_nh_release should\nnot be called if fib6_nh_init returns an error, but the commit below added\na call to ipv6_stub->fib6_nh_release in its error path. To fix it return\nthe dummy stub's -EAFNOSUPPORT error directly without calling\nipv6_stub->fib6_nh_release in nh_create_ipv6()'s error path.\n[1]\nOutput is a bit truncated, but it clearly shows the error.\nBUG: kernel NULL pointer dereference, address: 000000000000000000\n#PF: supervisor instruction fetch in kernel modede\n#PF: error_code(0x0010) - not-present pagege\nPGD 0 P4D 0\nOops: 0010 [#1] PREEMPT SMP NOPTI\nCPU: 4 PID: 638 Comm: ip Kdump: loaded Not tainted 5.16.0-rc1+ #446\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014\nRIP: 0010:0x0\nCode: Unable to access opcode bytes at RIP 0xffffffffffffffd6.\nRSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac\nRAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 0000000000000000\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881008a2860\nRBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 0000000000000000\nR10: ffff888109f5b978 R11: ffff888109f5b948 R12: 00000000ffffff9f\nR13: ffff8881008a2a80 R14: ffff8881008a2860 R15: ffff8881008a2840\nFS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0\nCall Trace:\n<TASK>\nnh_create_ipv6+0xed/0x10c\nrtm_new_nexthop+0x6d7/0x13f3\n? check_preemption_disabled+0x3d/0xf2\n? lock_is_held_type+0xbe/0xfd\nrtnetlink_rcv_msg+0x23f/0x26a\n? check_preemption_disabled+0x3d/0xf2\n? rtnl_calcit.isra.0+0x147/0x147\nnetlink_rcv_skb+0x61/0xb2\nnetlink_unicast+0x100/0x187\nnetlink_sendmsg+0x37f/0x3a0\n? netlink_unicast+0x187/0x187\nsock_sendmsg_nosec+0x67/0x9b\n____sys_sendmsg+0x19d/0x1f9\n? copy_msghdr_from_user+0x4c/0x5e\n? rcu_read_lock_any_held+0x2a/0x78\n___sys_sendmsg+0x6c/0x8c\n? asm_sysvec_apic_timer_interrupt+0x12/0x20\n? lockdep_hardirqs_on+0xd9/0x102\n? sockfd_lookup_light+0x69/0x99\n__sys_sendmsg+0x50/0x6e\ndo_syscall_64+0xcb/0xf2\nentry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7f98dea28914\nCode: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53\nRSP: 002b:00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e\nRAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914\nRDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003\nRBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008\nR10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000000001\nR13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0\n</TASK>\nModules linked in: bridge stp llc bonding virtio_net"], "name": "CVE-2021-47572", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47572\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47572\nhttps://lore.kernel.org/linux-cve-announce/2024052454-CVE-2021-47572-50bc@gregkh/T"], "threat_severity": "Moderate"}

{}