CVE-2025-38734 - Vulnerability Details

Link	Providers
https://git.kernel.org/stable/c/070b4af44c4b6e4c35fb1ca7001a6a88fd2d318f
https://git.kernel.org/stable/c/2e765ba0ee0eae35688b443e97108308a716773e
https://git.kernel.org/stable/c/85545f1525f9fa9bf44fec77ba011024f15da342
https://git.kernel.org/stable/c/d9cef55ed49117bd63695446fb84b4b91815c0b4

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: net/smc: fix UAF on smcsk after smc_listen_out() BPF CI testing report a UAF issue: [ 16.446633] BUG: kernel NULL pointer dereference, address: 000000000000003 0 [ 16.447134] #PF: supervisor read access in kernel mod e [ 16.447516] #PF: error_code(0x0000) - not-present pag e [ 16.447878] PGD 0 P4D 0 [ 16.448063] Oops: Oops: 0000 [#1] PREEMPT SMP NOPT I [ 16.448409] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Tainted: G OE 6.13.0-rc3-g89e8a75fda73-dirty #4 2 [ 16.449124] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODUL E [ 16.449502] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/201 4 [ 16.450201] Workqueue: smc_hs_wq smc_listen_wor k [ 16.450531] RIP: 0010:smc_listen_work+0xc02/0x159 0 [ 16.452158] RSP: 0018:ffffb5ab40053d98 EFLAGS: 0001024 6 [ 16.452526] RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000030 0 [ 16.452994] RDX: 0000000000000280 RSI: 00003513840053f0 RDI: 000000000000000 0 [ 16.453492] RBP: ffffa097808e3800 R08: ffffa09782dba1e0 R09: 000000000000000 5 [ 16.453987] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0978274640 0 [ 16.454497] R13: 0000000000000000 R14: 0000000000000000 R15: ffffa09782d4092 0 [ 16.454996] FS: 0000000000000000(0000) GS:ffffa097bbc00000(0000) knlGS:000000000000000 0 [ 16.455557] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003 3 [ 16.455961] CR2: 0000000000000030 CR3: 0000000102788004 CR4: 0000000000770ef 0 [ 16.456459] PKRU: 5555555 4 [ 16.456654] Call Trace : [ 16.456832] <TASK > [ 16.456989] ? __die+0x23/0x7 0 [ 16.457215] ? page_fault_oops+0x180/0x4c 0 [ 16.457508] ? __lock_acquire+0x3e6/0x249 0 [ 16.457801] ? exc_page_fault+0x68/0x20 0 [ 16.458080] ? asm_exc_page_fault+0x26/0x3 0 [ 16.458389] ? smc_listen_work+0xc02/0x159 0 [ 16.458689] ? smc_listen_work+0xc02/0x159 0 [ 16.458987] ? lock_is_held_type+0x8f/0x10 0 [ 16.459284] process_one_work+0x1ea/0x6d 0 [ 16.459570] worker_thread+0x1c3/0x38 0 [ 16.459839] ? __pfx_worker_thread+0x10/0x1 0 [ 16.460144] kthread+0xe0/0x11 0 [ 16.460372] ? __pfx_kthread+0x10/0x1 0 [ 16.460640] ret_from_fork+0x31/0x5 0 [ 16.460896] ? __pfx_kthread+0x10/0x1 0 [ 16.461166] ret_from_fork_asm+0x1a/0x3 0 [ 16.461453] </TASK > [ 16.461616] Modules linked in: bpf_testmod(OE) [last unloaded: bpf_testmod(OE) ] [ 16.462134] CR2: 000000000000003 0 [ 16.462380] ---[ end trace 0000000000000000 ]--- [ 16.462710] RIP: 0010:smc_listen_work+0xc02/0x1590 The direct cause of this issue is that after smc_listen_out_connected(), newclcsock->sk may be NULL since it will releases the smcsk. Therefore, if the application closes the socket immediately after accept, newclcsock->sk can be NULL. A possible execution order could be as follows: smc_listen_work \| userspace ----------------------------------------------------------------- lock_sock(sk) \| smc_listen_out_connected() \| \| \- smc_listen_out \| \| \| \- release_sock \| \| \|- sk->sk_data_ready() \| \| fd = accept(); \| close(fd); \| \- socket->sk = NULL; /* newclcsock->sk is NULL now */ SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk)) Since smc_listen_out_connected() will not fail, simply swapping the order of the code can easily fix this issue.
Title		net/smc: fix UAF on smcsk after smc_listen_out()
References		https://git.kernel.org/stable/c/070b4af44c4b6e4c35fb1ca7001a6a88fd2d318f https://git.kernel.org/stable/c/2e765ba0ee0eae35688b443e97108308a716773e https://git.kernel.org/stable/c/85545f1525f9fa9bf44fec77ba011024f15da342 https://git.kernel.org/stable/c/d9cef55ed49117bd63695446fb84b4b91815c0b4

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-38734", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.034Z", "datePublished": "2025-09-05T17:20:34.126Z", "dateUpdated": "2025-09-05T17:20:34.126Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-09-05T17:20:34.126Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix UAF on smcsk after smc_listen_out()\n\nBPF CI testing report a UAF issue:\n\n [ 16.446633] BUG: kernel NULL pointer dereference, address: 000000000000003 0\n [ 16.447134] #PF: supervisor read access in kernel mod e\n [ 16.447516] #PF: error_code(0x0000) - not-present pag e\n [ 16.447878] PGD 0 P4D 0\n [ 16.448063] Oops: Oops: 0000 [#1] PREEMPT SMP NOPT I\n [ 16.448409] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Tainted: G OE 6.13.0-rc3-g89e8a75fda73-dirty #4 2\n [ 16.449124] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODUL E\n [ 16.449502] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/201 4\n [ 16.450201] Workqueue: smc_hs_wq smc_listen_wor k\n [ 16.450531] RIP: 0010:smc_listen_work+0xc02/0x159 0\n [ 16.452158] RSP: 0018:ffffb5ab40053d98 EFLAGS: 0001024 6\n [ 16.452526] RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000030 0\n [ 16.452994] RDX: 0000000000000280 RSI: 00003513840053f0 RDI: 000000000000000 0\n [ 16.453492] RBP: ffffa097808e3800 R08: ffffa09782dba1e0 R09: 000000000000000 5\n [ 16.453987] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0978274640 0\n [ 16.454497] R13: 0000000000000000 R14: 0000000000000000 R15: ffffa09782d4092 0\n [ 16.454996] FS: 0000000000000000(0000) GS:ffffa097bbc00000(0000) knlGS:000000000000000 0\n [ 16.455557] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003 3\n [ 16.455961] CR2: 0000000000000030 CR3: 0000000102788004 CR4: 0000000000770ef 0\n [ 16.456459] PKRU: 5555555 4\n [ 16.456654] Call Trace :\n [ 16.456832] <TASK >\n [ 16.456989] ? __die+0x23/0x7 0\n [ 16.457215] ? page_fault_oops+0x180/0x4c 0\n [ 16.457508] ? __lock_acquire+0x3e6/0x249 0\n [ 16.457801] ? exc_page_fault+0x68/0x20 0\n [ 16.458080] ? asm_exc_page_fault+0x26/0x3 0\n [ 16.458389] ? smc_listen_work+0xc02/0x159 0\n [ 16.458689] ? smc_listen_work+0xc02/0x159 0\n [ 16.458987] ? lock_is_held_type+0x8f/0x10 0\n [ 16.459284] process_one_work+0x1ea/0x6d 0\n [ 16.459570] worker_thread+0x1c3/0x38 0\n [ 16.459839] ? __pfx_worker_thread+0x10/0x1 0\n [ 16.460144] kthread+0xe0/0x11 0\n [ 16.460372] ? __pfx_kthread+0x10/0x1 0\n [ 16.460640] ret_from_fork+0x31/0x5 0\n [ 16.460896] ? __pfx_kthread+0x10/0x1 0\n [ 16.461166] ret_from_fork_asm+0x1a/0x3 0\n [ 16.461453] </TASK >\n [ 16.461616] Modules linked in: bpf_testmod(OE) [last unloaded: bpf_testmod(OE) ]\n [ 16.462134] CR2: 000000000000003 0\n [ 16.462380] ---[ end trace 0000000000000000 ]---\n [ 16.462710] RIP: 0010:smc_listen_work+0xc02/0x1590\n\nThe direct cause of this issue is that after smc_listen_out_connected(),\nnewclcsock->sk may be NULL since it will releases the smcsk. Therefore,\nif the application closes the socket immediately after accept,\nnewclcsock->sk can be NULL. A possible execution order could be as\nfollows:\n\nsmc_listen_work | userspace\n-----------------------------------------------------------------\nlock_sock(sk) |\nsmc_listen_out_connected() |\n| \\- smc_listen_out |\n| | \\- release_sock |\n | |- sk->sk_data_ready() |\n | fd = accept();\n | close(fd);\n | \\- socket->sk = NULL;\n/* newclcsock->sk is NULL now */\nSMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk))\n\nSince smc_listen_out_connected() will not fail, simply swapping the order\nof the code can easily fix this issue."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/af_smc.c"], "versions": [{"version": "3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8", "lessThan": "070b4af44c4b6e4c35fb1ca7001a6a88fd2d318f", "status": "affected", "versionType": "git"}, {"version": "3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8", "lessThan": "2e765ba0ee0eae35688b443e97108308a716773e", "status": "affected", "versionType": "git"}, {"version": "3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8", "lessThan": "85545f1525f9fa9bf44fec77ba011024f15da342", "status": "affected", "versionType": "git"}, {"version": "3b2dec2603d5b06ad3af71c1164ca0b92df3d2a8", "lessThan": "d9cef55ed49117bd63695446fb84b4b91815c0b4", "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/smc/af_smc.c"], "versions": [{"version": "4.18", "status": "affected"}, {"version": "0", "lessThan": "4.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.103", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.44", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.4", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17-rc3", "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": "4.18", "versionEndExcluding": "6.6.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.12.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.16.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.17-rc3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/070b4af44c4b6e4c35fb1ca7001a6a88fd2d318f"}, {"url": "https://git.kernel.org/stable/c/2e765ba0ee0eae35688b443e97108308a716773e"}, {"url": "https://git.kernel.org/stable/c/85545f1525f9fa9bf44fec77ba011024f15da342"}, {"url": "https://git.kernel.org/stable/c/d9cef55ed49117bd63695446fb84b4b91815c0b4"}], "title": "net/smc: fix UAF on smcsk after smc_listen_out()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix UAF on smcsk after smc_listen_out()\n\nBPF CI testing report a UAF issue:\n\n [ 16.446633] BUG: kernel NULL pointer dereference, address: 000000000000003 0\n [ 16.447134] #PF: supervisor read access in kernel mod e\n [ 16.447516] #PF: error_code(0x0000) - not-present pag e\n [ 16.447878] PGD 0 P4D 0\n [ 16.448063] Oops: Oops: 0000 [#1] PREEMPT SMP NOPT I\n [ 16.448409] CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Tainted: G OE 6.13.0-rc3-g89e8a75fda73-dirty #4 2\n [ 16.449124] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODUL E\n [ 16.449502] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/201 4\n [ 16.450201] Workqueue: smc_hs_wq smc_listen_wor k\n [ 16.450531] RIP: 0010:smc_listen_work+0xc02/0x159 0\n [ 16.452158] RSP: 0018:ffffb5ab40053d98 EFLAGS: 0001024 6\n [ 16.452526] RAX: 0000000000000001 RBX: 0000000000000002 RCX: 000000000000030 0\n [ 16.452994] RDX: 0000000000000280 RSI: 00003513840053f0 RDI: 000000000000000 0\n [ 16.453492] RBP: ffffa097808e3800 R08: ffffa09782dba1e0 R09: 000000000000000 5\n [ 16.453987] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0978274640 0\n [ 16.454497] R13: 0000000000000000 R14: 0000000000000000 R15: ffffa09782d4092 0\n [ 16.454996] FS: 0000000000000000(0000) GS:ffffa097bbc00000(0000) knlGS:000000000000000 0\n [ 16.455557] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003 3\n [ 16.455961] CR2: 0000000000000030 CR3: 0000000102788004 CR4: 0000000000770ef 0\n [ 16.456459] PKRU: 5555555 4\n [ 16.456654] Call Trace :\n [ 16.456832] <TASK >\n [ 16.456989] ? __die+0x23/0x7 0\n [ 16.457215] ? page_fault_oops+0x180/0x4c 0\n [ 16.457508] ? __lock_acquire+0x3e6/0x249 0\n [ 16.457801] ? exc_page_fault+0x68/0x20 0\n [ 16.458080] ? asm_exc_page_fault+0x26/0x3 0\n [ 16.458389] ? smc_listen_work+0xc02/0x159 0\n [ 16.458689] ? smc_listen_work+0xc02/0x159 0\n [ 16.458987] ? lock_is_held_type+0x8f/0x10 0\n [ 16.459284] process_one_work+0x1ea/0x6d 0\n [ 16.459570] worker_thread+0x1c3/0x38 0\n [ 16.459839] ? __pfx_worker_thread+0x10/0x1 0\n [ 16.460144] kthread+0xe0/0x11 0\n [ 16.460372] ? __pfx_kthread+0x10/0x1 0\n [ 16.460640] ret_from_fork+0x31/0x5 0\n [ 16.460896] ? __pfx_kthread+0x10/0x1 0\n [ 16.461166] ret_from_fork_asm+0x1a/0x3 0\n [ 16.461453] </TASK >\n [ 16.461616] Modules linked in: bpf_testmod(OE) [last unloaded: bpf_testmod(OE) ]\n [ 16.462134] CR2: 000000000000003 0\n [ 16.462380] ---[ end trace 0000000000000000 ]---\n [ 16.462710] RIP: 0010:smc_listen_work+0xc02/0x1590\n\nThe direct cause of this issue is that after smc_listen_out_connected(),\nnewclcsock->sk may be NULL since it will releases the smcsk. Therefore,\nif the application closes the socket immediately after accept,\nnewclcsock->sk can be NULL. A possible execution order could be as\nfollows:\n\nsmc_listen_work | userspace\n-----------------------------------------------------------------\nlock_sock(sk) |\nsmc_listen_out_connected() |\n| \\- smc_listen_out |\n| | \\- release_sock |\n | |- sk->sk_data_ready() |\n | fd = accept();\n | close(fd);\n | \\- socket->sk = NULL;\n/* newclcsock->sk is NULL now */\nSMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk))\n\nSince smc_listen_out_connected() will not fail, simply swapping the order\nof the code can easily fix this issue."}], "id": "CVE-2025-38734", "lastModified": "2025-09-05T18:15:42.677", "metrics": {}, "published": "2025-09-05T18:15:42.677", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/070b4af44c4b6e4c35fb1ca7001a6a88fd2d318f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2e765ba0ee0eae35688b443e97108308a716773e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/85545f1525f9fa9bf44fec77ba011024f15da342"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d9cef55ed49117bd63695446fb84b4b91815c0b4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

Metrics

Affected Vendors & Products

Metrics

Affected Vendors & Products

JSON object

JSON object

JSON object

JSON object

JSON object