{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99032","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.387Z","datePublished":"2026-10-23T12:21:36.202Z","dateUpdated":"2026-10-30T12:41:05.122Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-30T12:41:05.122Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: protect clcsock lifetime in smc_getname\n\nsmc_getname() dereferences smc->clcsock without holding\nclcsock_release_lock. Link-group termination can release the CLC socket\nthrough smc_close_active_abort() while the SMC socket is still open,\nfor example after shutdown(SHUT_WR).\n\nA getsockname() caller can load smc->clcsock, then the termination worker\ncan clear the pointer and call sock_release() before the caller accesses\nclcsock->ops or invokes getname(). This causes a use-after-free; if the\nworker clears the pointer before the load, it causes a NULL dereference.\nThe syscall's file reference keeps the SMC socket alive but does not\nprevent asynchronous release of its CLC socket.\n\nKASAN reported the following with test-only timing instrumentation:\n\n  BUG: KASAN: slab-use-after-free in smc_getname+0x19e/0x1b0\n  Read of size 8 at addr ffff888109abb4e0 by task poc/103\n  Call Trace:\n   smc_getname+0x19e/0x1b0\n   do_getsockname+0xe5/0x170\n   __sys_getsockname+0x8c/0x100\n\n  Allocated by task 95:\n   sock_alloc_inode+0x1e/0x280\n   sock_alloc+0x3d/0x240\n   __sock_create+0x7e/0x430\n   smc_create+0x121/0x240\n\n  Freed by task 0:\n   kmem_cache_free+0xcc/0x340\n   rcu_core+0x50a/0x1850\n\n  Last potentially related work creation:\n   evict+0x446/0x6c0\n   smc_clcsock_release+0xa8/0xd0\n   smc_close_active_abort+0x26a/0x3a0\n   __smc_lgr_terminate.part.0+0x137/0x2e0\n\nHold clcsock_release_lock across the pointer check and the getname()\ncallback to serialize with smc_clcsock_release(). Return -EBADF if the\nCLC socket has already been released, preserving the existing peer\nstate check and the callback's return value otherwise."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - getsockname(2) on an attacker-owned SMC fd follows __sys_getsockname()->do_getsockname()->smc_getname(), whose unlocked clcsock dereference is the fault; no SMC/TCP message invokes smc_getname(), so a remote peer alone cannot trigger it.\nAC:L - After shutdown(SHUT_WR) moves the socket to SMC_PEERCLOSEWAIT1, the attacker can loop getsockname() while its SMC peer sends LLC DELETE LINK ALL, driving __smc_lgr_terminate()->smc_close_active_abort()->smc_clcsock_release(); both race sides are attacker-controlled.\nPR:L - smc_create() accepts SOCK_STREAM with SMCPROTO_SMC or SMCPROTO_SMC6 without capable() or ns_capable(), while shutdown() and getsockname() require only the socket fd; an ordinary local user can execute the complete path.\nUI:N - The attacker creates and connects the SMC socket, calls shutdown(SHUT_WR), and races getsockname() against termination without requiring another user to mount, open, or approve anything.\nS:U - smc_getname() and the freed CLC socket execute within the same host kernel security authority; this path crosses no guest-host, IOMMU, or other separately governed boundary.\nC:H - The stale struct socket contains both ops and sk; after sock_inode_cache reuse, the indirect getname callback can consume attacker-groomed recycled socket state and return data to userspace, giving the UAF a kernel-memory disclosure primitive.\nI:H - The freed struct socket supplies the indirect ops->getname target and its sk operand; reclaiming it with attacker-created sockets permits callback/operand confusion and mutable kernel-socket access, supporting control-flow or write-oriented exploitation.\nA:H - If smc_clcsock_release() clears the pointer first, smc_getname() dereferences NULL; if freeing follows the caller's load, KASAN confirms a slab use-after-free. Either path can produce a kernel oops or panic."}]}],"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":"b03faa1fafc8018295401dc558bdc76362d860a4","lessThan":"5d0fa089d5ed497366ea5c000c6eefb346c7cb01","status":"affected","versionType":"git"},{"version":"b03faa1fafc8018295401dc558bdc76362d860a4","lessThan":"94a43efd71ad440c35dd469559d3a6d665f102d9","status":"affected","versionType":"git"},{"version":"b03faa1fafc8018295401dc558bdc76362d860a4","lessThan":"04069199816285c49199a35971f4298199609687","status":"affected","versionType":"git"},{"version":"b03faa1fafc8018295401dc558bdc76362d860a4","lessThan":"e607017a553d2a48e428ec8b8ffb06bf3bb92ce9","status":"affected","versionType":"git"},{"version":"b03faa1fafc8018295401dc558bdc76362d860a4","lessThan":"1512e3714b3946bda75a160a34f22a51710daa43","status":"affected","versionType":"git"},{"version":"b03faa1fafc8018295401dc558bdc76362d860a4","lessThan":"6a1833f0d7dc037c8e876b9178ba69d5d107c086","status":"affected","versionType":"git"},{"version":"b03faa1fafc8018295401dc558bdc76362d860a4","lessThan":"c223da71abfaea2ebb1c7208ae9ebf15038f9388","status":"affected","versionType":"git"},{"version":"b03faa1fafc8018295401dc558bdc76362d860a4","lessThan":"64a6b36b0e1855288080bc5f89769f27d6dc03c8","status":"affected","versionType":"git"},{"version":"0b6153d04c96a1d4b6284692386aa21d04d7956c","status":"affected","versionType":"git"},{"version":"4.19.299","lessThan":"4.20","status":"affected","versionType":"semver"}]},{"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":"5.1","status":"affected"},{"version":"0","lessThan":"5.1","status":"unaffected","versionType":"semver"},{"version":"5.10.273","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.224","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.191","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.57","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.11","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","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":"5.1","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.299"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/5d0fa089d5ed497366ea5c000c6eefb346c7cb01"},{"url":"https://git.kernel.org/stable/c/94a43efd71ad440c35dd469559d3a6d665f102d9"},{"url":"https://git.kernel.org/stable/c/04069199816285c49199a35971f4298199609687"},{"url":"https://git.kernel.org/stable/c/e607017a553d2a48e428ec8b8ffb06bf3bb92ce9"},{"url":"https://git.kernel.org/stable/c/1512e3714b3946bda75a160a34f22a51710daa43"},{"url":"https://git.kernel.org/stable/c/6a1833f0d7dc037c8e876b9178ba69d5d107c086"},{"url":"https://git.kernel.org/stable/c/c223da71abfaea2ebb1c7208ae9ebf15038f9388"},{"url":"https://git.kernel.org/stable/c/64a6b36b0e1855288080bc5f89769f27d6dc03c8"}],"title":"net/smc: protect clcsock lifetime in smc_getname","x_generator":{"engine":"bippy-1.2.0"}}}}