{"id":"CVE-2026-99032","summary":"net/smc: protect clcsock lifetime in smc_getname","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: protect clcsock lifetime in smc_getname\n\nsmc_getname() dereferences smc-\u003eclcsock 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-\u003eclcsock, then the termination worker\ncan clear the pointer and call sock_release() before the caller accesses\nclcsock-\u003eops 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.","modified":"2026-11-01T02:30:24.015221231Z","published":"2026-10-23T12:21:36.202Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99032.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/04069199816285c49199a35971f4298199609687"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1512e3714b3946bda75a160a34f22a51710daa43"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5d0fa089d5ed497366ea5c000c6eefb346c7cb01"},{"type":"WEB","url":"https://git.kernel.org/stable/c/64a6b36b0e1855288080bc5f89769f27d6dc03c8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6a1833f0d7dc037c8e876b9178ba69d5d107c086"},{"type":"WEB","url":"https://git.kernel.org/stable/c/94a43efd71ad440c35dd469559d3a6d665f102d9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c223da71abfaea2ebb1c7208ae9ebf15038f9388"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e607017a553d2a48e428ec8b8ffb06bf3bb92ce9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99032.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99032"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b03faa1fafc8018295401dc558bdc76362d860a4"},{"fixed":"5d0fa089d5ed497366ea5c000c6eefb346c7cb01"},{"fixed":"94a43efd71ad440c35dd469559d3a6d665f102d9"},{"fixed":"04069199816285c49199a35971f4298199609687"},{"fixed":"e607017a553d2a48e428ec8b8ffb06bf3bb92ce9"},{"fixed":"1512e3714b3946bda75a160a34f22a51710daa43"},{"fixed":"6a1833f0d7dc037c8e876b9178ba69d5d107c086"},{"fixed":"c223da71abfaea2ebb1c7208ae9ebf15038f9388"},{"fixed":"64a6b36b0e1855288080bc5f89769f27d6dc03c8"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.299"},{"fixed":"4.20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0b6153d04c96a1d4b6284692386aa21d04d7956c"}]}],"versions":["v4.19.325","v4.19.324","v4.19.323","v4.19.322","v4.19.321","v4.19.320","v4.19.319","v4.19.318","v4.19.317","v4.19.316","v4.19.315","v4.19.314","v4.19.313","v4.19.312","v4.19.311","v4.19.310","v4.19.309","v4.19.308","v4.19.307","v4.19.306","v4.19.305","v4.19.304","v4.19.303","v4.19.302","v4.19.301","v4.19.300","v4.19.299"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99032.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.1.0"},{"fixed":"5.10.273"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.191"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.160"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.113"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.57"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-99032.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}