{"id":"CVE-2026-99032","title":"net/smc: protect clcsock lifetime in smc_getname","summary":"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 C…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < e607017a553d2a48e428ec8b8ffb06bf3bb92ce9","Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < 1512e3714b3946bda75a160a34f22a51710daa43","Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < 6a1833f0d7dc037c8e876b9178ba69d5d107c086","Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < c223da71abfaea2ebb1c7208ae9ebf15038f9388","Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < 64a6b36b0e1855288080bc5f89769f27d6dc03c8","Linux 0b6153d04c96a1d4b6284692386aa21d04d7956c","Linux >= 4.19.299 < 4.20","Linux 5.1"],"published":"2026-10-23","updated":"2026-10-24","sourceUpdated":"2026-10-24T14:10:08.095Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99032","references":[{"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"}],"tags":["cve.org"],"epss":0.00209,"epssPercentile":0.10515,"ingestedAt":"2026-10-23T13:24:55.530Z","slug":"CVE-2026-99032","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < e607017a553d2a48e428ec8b8ffb06bf3bb92ce9`\n- `Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < 1512e3714b3946bda75a160a34f22a51710daa43`\n- `Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < 6a1833f0d7dc037c8e876b9178ba69d5d107c086`\n- `Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < c223da71abfaea2ebb1c7208ae9ebf15038f9388`\n- `Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < 64a6b36b0e1855288080bc5f89769f27d6dc03c8`\n- `Linux 0b6153d04c96a1d4b6284692386aa21d04d7956c`\n- `Linux >= 4.19.299 < 4.20`\n- `Linux 5.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":228844,"id":"CVE-2026-99032","ts":1792854089382,"field":"cvss","old":null,"new":"7.8"},{"seq":228843,"id":"CVE-2026-99032","ts":1792854089382,"field":"severity","old":"none","new":"high"}]}