{"api_version":"1","generated_at":"2026-10-01T07:41:54+00:00","cve":"CVE-2026-93208","urls":{"html":"https://cve.report/CVE-2026-93208","api":"https://cve.report/api/cve/CVE-2026-93208.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93208","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93208"},"summary":{"title":"kasan: fix cache shrink race with CPU hotplug","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nkasan: fix cache shrink race with CPU hotplug\n\nkasan_quarantine_remove_cache() first invokes per_cpu_remove_cache() on\nall online CPUs.  Each callback moves objects belonging to the cache from\ncpu_quarantine to the CPU's shrink_qlist, where they can later be freed\nfrom task context.\n\nkmem_cache_destroy() invokes the quarantine removal path while holding\ncpus_read_lock(), but kmem_cache_shrink() does not.  The latter can\ntherefore race with CPU offlining as follows:\n\n  kmem_cache_shrink()             CPU hotplug\n  -------------------             -----------\n  on_each_cpu()\n    CPU1 moves objects to\n    CPU1's shrink_qlist\n  on_each_cpu() returns\n                                  CPU1 goes offline\n                                  kasan_cpu_offline()\n                                    drains cpu_quarantine\n                                    leaves shrink_qlist untouched\n  for_each_online_cpu()\n    skips CPU1\n\nThe objects left on CPU1's shrink_qlist are not returned to the slab\nallocator.  This may prevent kmem_cache_shrink() from releasing slabs that\nwould otherwise become empty.  If CPU1 remains offline, a later\nkmem_cache_destroy() also skips the list and can report that the cache\nstill contains objects.\n\nAn intermittent occurrence was observed with a virtio-9p filesystem.  The\nmount and umount commands both returned 0, but the kernel logged the\nfollowing during the userspace-triggered teardown:\n\n  [  2994.380134][  T111] BUG 9p-fcall-cache-1 (Tainted: G    B              ): Objects remaining on __kmem_cache_shutdown()\n  [  2994.381140][  T111] Object 0xff11000004361118 @offset=4376\n  [  2994.381607][  T111] Allocated in p9_fcall_init+0x201/0x400 age=19564 cpu=1 pid=104\n  [  2994.382591][  T111]  p9_fcall_init+0x201/0x400\n  [  2994.382810][  T111]  p9_tag_alloc+0x12f/0x700\n  [  2994.382982][  T111]  p9_client_prepare_req+0x102/0x3e0\n  [  2994.383165][  T111]  p9_client_rpc+0x1ab/0xa50\n  [  2994.383334][  T111]  p9_client_getattr_dotl+0xb0/0x1a0\n  [  2994.383515][  T111]  v9fs_vfs_getattr_dotl+0x115/0x360\n  [  2994.383719][  T111]  vfs_getattr_nosec+0x22c/0x3a0\n  [  2994.383910][  T111]  vfs_statx+0xd7/0x170\n  [  2994.384062][  T111]  vfs_fstatat+0x45/0x80\n  [  2994.384215][  T111]  __do_sys_newfstatat+0x84/0xe0\n  [  2994.384386][  T111]  do_syscall_64+0x115/0x6a0\n  [  2994.384566][  T111]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  [  2994.399720][  T111] WARNING: mm/slub.c:1244 at __kmem_cache_shutdown+0x363/0x500, CPU#0: busybox/111\n  [  2994.405655][  T111] Call Trace:\n  [  2994.406325][  T111]  kmem_cache_destroy+0x73/0x1b0\n  [  2994.406630][  T111]  p9_client_destroy+0x271/0x3c0\n  [  2994.407210][  T111]  v9fs_session_close+0x3c/0x260\n  [  2994.407409][  T111]  v9fs_kill_super+0x48/0x90\n  [  2994.407584][  T111]  deactivate_locked_super+0xa3/0x160\n  [  2994.407778][  T111]  cleanup_mnt+0x1dd/0x3e0\n\nThus, a successful umount left objects in the 9p fcall cache and prevented\nthe cache from being destroyed cleanly.\n\nPer-CPU shrink_qlist storage exists for every possible CPU, and each list\nis protected by its own raw spinlock.  Iterate over possible CPUs so that\na list populated before its CPU went offline is drained as well.\n\nfor_each_possible_cpu() can do more work than for_each_online_cpu(), but\nthis change only affects CONFIG_KASAN_GENERIC kernels.  The extra work is\nlimited to cache shrink and cache destruction paths and does not affect\nthe normal allocation/free fast path.  It adds one raw-spinlock-protected\nscan of each possible CPU's shrink list.  These lists are normally empty;\na non-empty list is traversed to remove objects belonging to the cache\nbeing shrunk or destroyed.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-24 16:17:15","updated_at":"2026-09-24 16:17:15"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/7cd164f0e1bab0f8dd125c92ed4f19bbd6b92a4a","name":"https://git.kernel.org/stable/c/7cd164f0e1bab0f8dd125c92ed4f19bbd6b92a4a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3119d58e4ef8719d669911d38a53fc00086ac48b","name":"https://git.kernel.org/stable/c/3119d58e4ef8719d669911d38a53fc00086ac48b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8790303cbaac52a11dfed4aab261f8ea60682525","name":"https://git.kernel.org/stable/c/8790303cbaac52a11dfed4aab261f8ea60682525","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/709c3646545e0a1f99a5816384c633f6552c5a98","name":"https://git.kernel.org/stable/c/709c3646545e0a1f99a5816384c633f6552c5a98","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/30e8cb8598aa41b1b9f8803081d2ae5e5369c0f3","name":"https://git.kernel.org/stable/c/30e8cb8598aa41b1b9f8803081d2ae5e5369c0f3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93208","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93208","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 07d067e4f2ceb72b9f681995cc53828caaba9e6e 7cd164f0e1bab0f8dd125c92ed4f19bbd6b92a4a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 07d067e4f2ceb72b9f681995cc53828caaba9e6e 709c3646545e0a1f99a5816384c633f6552c5a98 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 07d067e4f2ceb72b9f681995cc53828caaba9e6e 30e8cb8598aa41b1b9f8803081d2ae5e5369c0f3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 07d067e4f2ceb72b9f681995cc53828caaba9e6e 3119d58e4ef8719d669911d38a53fc00086ac48b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 07d067e4f2ceb72b9f681995cc53828caaba9e6e 8790303cbaac52a11dfed4aab261f8ea60682525 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["mm/kasan/quarantine.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"7cd164f0e1bab0f8dd125c92ed4f19bbd6b92a4a","status":"affected","version":"07d067e4f2ceb72b9f681995cc53828caaba9e6e","versionType":"git"},{"lessThan":"709c3646545e0a1f99a5816384c633f6552c5a98","status":"affected","version":"07d067e4f2ceb72b9f681995cc53828caaba9e6e","versionType":"git"},{"lessThan":"30e8cb8598aa41b1b9f8803081d2ae5e5369c0f3","status":"affected","version":"07d067e4f2ceb72b9f681995cc53828caaba9e6e","versionType":"git"},{"lessThan":"3119d58e4ef8719d669911d38a53fc00086ac48b","status":"affected","version":"07d067e4f2ceb72b9f681995cc53828caaba9e6e","versionType":"git"},{"lessThan":"8790303cbaac52a11dfed4aab261f8ea60682525","status":"affected","version":"07d067e4f2ceb72b9f681995cc53828caaba9e6e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["mm/kasan/quarantine.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.19"},{"lessThan":"5.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nkasan: fix cache shrink race with CPU hotplug\n\nkasan_quarantine_remove_cache() first invokes per_cpu_remove_cache() on\nall online CPUs.  Each callback moves objects belonging to the cache from\ncpu_quarantine to the CPU's shrink_qlist, where they can later be freed\nfrom task context.\n\nkmem_cache_destroy() invokes the quarantine removal path while holding\ncpus_read_lock(), but kmem_cache_shrink() does not.  The latter can\ntherefore race with CPU offlining as follows:\n\n  kmem_cache_shrink()             CPU hotplug\n  -------------------             -----------\n  on_each_cpu()\n    CPU1 moves objects to\n    CPU1's shrink_qlist\n  on_each_cpu() returns\n                                  CPU1 goes offline\n                                  kasan_cpu_offline()\n                                    drains cpu_quarantine\n                                    leaves shrink_qlist untouched\n  for_each_online_cpu()\n    skips CPU1\n\nThe objects left on CPU1's shrink_qlist are not returned to the slab\nallocator.  This may prevent kmem_cache_shrink() from releasing slabs that\nwould otherwise become empty.  If CPU1 remains offline, a later\nkmem_cache_destroy() also skips the list and can report that the cache\nstill contains objects.\n\nAn intermittent occurrence was observed with a virtio-9p filesystem.  The\nmount and umount commands both returned 0, but the kernel logged the\nfollowing during the userspace-triggered teardown:\n\n  [  2994.380134][  T111] BUG 9p-fcall-cache-1 (Tainted: G    B              ): Objects remaining on __kmem_cache_shutdown()\n  [  2994.381140][  T111] Object 0xff11000004361118 @offset=4376\n  [  2994.381607][  T111] Allocated in p9_fcall_init+0x201/0x400 age=19564 cpu=1 pid=104\n  [  2994.382591][  T111]  p9_fcall_init+0x201/0x400\n  [  2994.382810][  T111]  p9_tag_alloc+0x12f/0x700\n  [  2994.382982][  T111]  p9_client_prepare_req+0x102/0x3e0\n  [  2994.383165][  T111]  p9_client_rpc+0x1ab/0xa50\n  [  2994.383334][  T111]  p9_client_getattr_dotl+0xb0/0x1a0\n  [  2994.383515][  T111]  v9fs_vfs_getattr_dotl+0x115/0x360\n  [  2994.383719][  T111]  vfs_getattr_nosec+0x22c/0x3a0\n  [  2994.383910][  T111]  vfs_statx+0xd7/0x170\n  [  2994.384062][  T111]  vfs_fstatat+0x45/0x80\n  [  2994.384215][  T111]  __do_sys_newfstatat+0x84/0xe0\n  [  2994.384386][  T111]  do_syscall_64+0x115/0x6a0\n  [  2994.384566][  T111]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  [  2994.399720][  T111] WARNING: mm/slub.c:1244 at __kmem_cache_shutdown+0x363/0x500, CPU#0: busybox/111\n  [  2994.405655][  T111] Call Trace:\n  [  2994.406325][  T111]  kmem_cache_destroy+0x73/0x1b0\n  [  2994.406630][  T111]  p9_client_destroy+0x271/0x3c0\n  [  2994.407210][  T111]  v9fs_session_close+0x3c/0x260\n  [  2994.407409][  T111]  v9fs_kill_super+0x48/0x90\n  [  2994.407584][  T111]  deactivate_locked_super+0xa3/0x160\n  [  2994.407778][  T111]  cleanup_mnt+0x1dd/0x3e0\n\nThus, a successful umount left objects in the 9p fcall cache and prevented\nthe cache from being destroyed cleanly.\n\nPer-CPU shrink_qlist storage exists for every possible CPU, and each list\nis protected by its own raw spinlock.  Iterate over possible CPUs so that\na list populated before its CPU went offline is drained as well.\n\nfor_each_possible_cpu() can do more work than for_each_online_cpu(), but\nthis change only affects CONFIG_KASAN_GENERIC kernels.  The extra work is\nlimited to cache shrink and cache destruction paths and does not affect\nthe normal allocation/free fast path.  It adds one raw-spinlock-protected\nscan of each possible CPU's shrink list.  These lists are normally empty;\na non-empty list is traversed to remove objects belonging to the cache\nbeing shrunk or destroyed."}],"providerMetadata":{"dateUpdated":"2026-09-24T15:10:31.888Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/7cd164f0e1bab0f8dd125c92ed4f19bbd6b92a4a"},{"url":"https://git.kernel.org/stable/c/709c3646545e0a1f99a5816384c633f6552c5a98"},{"url":"https://git.kernel.org/stable/c/30e8cb8598aa41b1b9f8803081d2ae5e5369c0f3"},{"url":"https://git.kernel.org/stable/c/3119d58e4ef8719d669911d38a53fc00086ac48b"},{"url":"https://git.kernel.org/stable/c/8790303cbaac52a11dfed4aab261f8ea60682525"}],"title":"kasan: fix cache shrink race with CPU hotplug","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93208","datePublished":"2026-09-24T15:10:31.888Z","dateReserved":"2026-09-17T16:02:15.093Z","dateUpdated":"2026-09-24T15:10:31.888Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-24 16:17:15","lastModifiedDate":"2026-09-24 16:17:15","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93208","Ordinal":"1","Title":"kasan: fix cache shrink race with CPU hotplug","CVE":"CVE-2026-93208","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93208","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nkasan: fix cache shrink race with CPU hotplug\n\nkasan_quarantine_remove_cache() first invokes per_cpu_remove_cache() on\nall online CPUs.  Each callback moves objects belonging to the cache from\ncpu_quarantine to the CPU's shrink_qlist, where they can later be freed\nfrom task context.\n\nkmem_cache_destroy() invokes the quarantine removal path while holding\ncpus_read_lock(), but kmem_cache_shrink() does not.  The latter can\ntherefore race with CPU offlining as follows:\n\n  kmem_cache_shrink()             CPU hotplug\n  -------------------             -----------\n  on_each_cpu()\n    CPU1 moves objects to\n    CPU1's shrink_qlist\n  on_each_cpu() returns\n                                  CPU1 goes offline\n                                  kasan_cpu_offline()\n                                    drains cpu_quarantine\n                                    leaves shrink_qlist untouched\n  for_each_online_cpu()\n    skips CPU1\n\nThe objects left on CPU1's shrink_qlist are not returned to the slab\nallocator.  This may prevent kmem_cache_shrink() from releasing slabs that\nwould otherwise become empty.  If CPU1 remains offline, a later\nkmem_cache_destroy() also skips the list and can report that the cache\nstill contains objects.\n\nAn intermittent occurrence was observed with a virtio-9p filesystem.  The\nmount and umount commands both returned 0, but the kernel logged the\nfollowing during the userspace-triggered teardown:\n\n  [  2994.380134][  T111] BUG 9p-fcall-cache-1 (Tainted: G    B              ): Objects remaining on __kmem_cache_shutdown()\n  [  2994.381140][  T111] Object 0xff11000004361118 @offset=4376\n  [  2994.381607][  T111] Allocated in p9_fcall_init+0x201/0x400 age=19564 cpu=1 pid=104\n  [  2994.382591][  T111]  p9_fcall_init+0x201/0x400\n  [  2994.382810][  T111]  p9_tag_alloc+0x12f/0x700\n  [  2994.382982][  T111]  p9_client_prepare_req+0x102/0x3e0\n  [  2994.383165][  T111]  p9_client_rpc+0x1ab/0xa50\n  [  2994.383334][  T111]  p9_client_getattr_dotl+0xb0/0x1a0\n  [  2994.383515][  T111]  v9fs_vfs_getattr_dotl+0x115/0x360\n  [  2994.383719][  T111]  vfs_getattr_nosec+0x22c/0x3a0\n  [  2994.383910][  T111]  vfs_statx+0xd7/0x170\n  [  2994.384062][  T111]  vfs_fstatat+0x45/0x80\n  [  2994.384215][  T111]  __do_sys_newfstatat+0x84/0xe0\n  [  2994.384386][  T111]  do_syscall_64+0x115/0x6a0\n  [  2994.384566][  T111]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  [  2994.399720][  T111] WARNING: mm/slub.c:1244 at __kmem_cache_shutdown+0x363/0x500, CPU#0: busybox/111\n  [  2994.405655][  T111] Call Trace:\n  [  2994.406325][  T111]  kmem_cache_destroy+0x73/0x1b0\n  [  2994.406630][  T111]  p9_client_destroy+0x271/0x3c0\n  [  2994.407210][  T111]  v9fs_session_close+0x3c/0x260\n  [  2994.407409][  T111]  v9fs_kill_super+0x48/0x90\n  [  2994.407584][  T111]  deactivate_locked_super+0xa3/0x160\n  [  2994.407778][  T111]  cleanup_mnt+0x1dd/0x3e0\n\nThus, a successful umount left objects in the 9p fcall cache and prevented\nthe cache from being destroyed cleanly.\n\nPer-CPU shrink_qlist storage exists for every possible CPU, and each list\nis protected by its own raw spinlock.  Iterate over possible CPUs so that\na list populated before its CPU went offline is drained as well.\n\nfor_each_possible_cpu() can do more work than for_each_online_cpu(), but\nthis change only affects CONFIG_KASAN_GENERIC kernels.  The extra work is\nlimited to cache shrink and cache destruction paths and does not affect\nthe normal allocation/free fast path.  It adds one raw-spinlock-protected\nscan of each possible CPU's shrink list.  These lists are normally empty;\na non-empty list is traversed to remove objects belonging to the cache\nbeing shrunk or destroyed.","Type":"Description","Title":"kasan: fix cache shrink race with CPU hotplug"}]}}}