CVE-2026-93208 (GCVE-0-2026-93208)

Vulnerability from cvelistv5 – Published: 2026-09-24 15:10 – Updated: 2026-09-24 15:10
VLAI
Title
kasan: fix cache shrink race with CPU hotplug
Summary
In the Linux kernel, the following vulnerability has been resolved: kasan: fix cache shrink race with CPU hotplug kasan_quarantine_remove_cache() first invokes per_cpu_remove_cache() on all online CPUs. Each callback moves objects belonging to the cache from cpu_quarantine to the CPU's shrink_qlist, where they can later be freed from task context. kmem_cache_destroy() invokes the quarantine removal path while holding cpus_read_lock(), but kmem_cache_shrink() does not. The latter can therefore race with CPU offlining as follows: kmem_cache_shrink() CPU hotplug ------------------- ----------- on_each_cpu() CPU1 moves objects to CPU1's shrink_qlist on_each_cpu() returns CPU1 goes offline kasan_cpu_offline() drains cpu_quarantine leaves shrink_qlist untouched for_each_online_cpu() skips CPU1 The objects left on CPU1's shrink_qlist are not returned to the slab allocator. This may prevent kmem_cache_shrink() from releasing slabs that would otherwise become empty. If CPU1 remains offline, a later kmem_cache_destroy() also skips the list and can report that the cache still contains objects. An intermittent occurrence was observed with a virtio-9p filesystem. The mount and umount commands both returned 0, but the kernel logged the following during the userspace-triggered teardown: [ 2994.380134][ T111] BUG 9p-fcall-cache-1 (Tainted: G B ): Objects remaining on __kmem_cache_shutdown() [ 2994.381140][ T111] Object 0xff11000004361118 @offset=4376 [ 2994.381607][ T111] Allocated in p9_fcall_init+0x201/0x400 age=19564 cpu=1 pid=104 [ 2994.382591][ T111] p9_fcall_init+0x201/0x400 [ 2994.382810][ T111] p9_tag_alloc+0x12f/0x700 [ 2994.382982][ T111] p9_client_prepare_req+0x102/0x3e0 [ 2994.383165][ T111] p9_client_rpc+0x1ab/0xa50 [ 2994.383334][ T111] p9_client_getattr_dotl+0xb0/0x1a0 [ 2994.383515][ T111] v9fs_vfs_getattr_dotl+0x115/0x360 [ 2994.383719][ T111] vfs_getattr_nosec+0x22c/0x3a0 [ 2994.383910][ T111] vfs_statx+0xd7/0x170 [ 2994.384062][ T111] vfs_fstatat+0x45/0x80 [ 2994.384215][ T111] __do_sys_newfstatat+0x84/0xe0 [ 2994.384386][ T111] do_syscall_64+0x115/0x6a0 [ 2994.384566][ T111] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 2994.399720][ T111] WARNING: mm/slub.c:1244 at __kmem_cache_shutdown+0x363/0x500, CPU#0: busybox/111 [ 2994.405655][ T111] Call Trace: [ 2994.406325][ T111] kmem_cache_destroy+0x73/0x1b0 [ 2994.406630][ T111] p9_client_destroy+0x271/0x3c0 [ 2994.407210][ T111] v9fs_session_close+0x3c/0x260 [ 2994.407409][ T111] v9fs_kill_super+0x48/0x90 [ 2994.407584][ T111] deactivate_locked_super+0xa3/0x160 [ 2994.407778][ T111] cleanup_mnt+0x1dd/0x3e0 Thus, a successful umount left objects in the 9p fcall cache and prevented the cache from being destroyed cleanly. Per-CPU shrink_qlist storage exists for every possible CPU, and each list is protected by its own raw spinlock. Iterate over possible CPUs so that a list populated before its CPU went offline is drained as well. for_each_possible_cpu() can do more work than for_each_online_cpu(), but this change only affects CONFIG_KASAN_GENERIC kernels. The extra work is limited to cache shrink and cache destruction paths and does not affect the normal allocation/free fast path. It adds one raw-spinlock-protected scan of each possible CPU's shrink list. These lists are normally empty; a non-empty list is traversed to remove objects belonging to the cache being shrunk or destroyed.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 07d067e4f2ceb72b9f681995cc53828caaba9e6e , < 7cd164f0e1bab0f8dd125c92ed4f19bbd6b92a4a (git)
Affected: 07d067e4f2ceb72b9f681995cc53828caaba9e6e , < 709c3646545e0a1f99a5816384c633f6552c5a98 (git)
Affected: 07d067e4f2ceb72b9f681995cc53828caaba9e6e , < 30e8cb8598aa41b1b9f8803081d2ae5e5369c0f3 (git)
Affected: 07d067e4f2ceb72b9f681995cc53828caaba9e6e , < 3119d58e4ef8719d669911d38a53fc00086ac48b (git)
Affected: 07d067e4f2ceb72b9f681995cc53828caaba9e6e , < 8790303cbaac52a11dfed4aab261f8ea60682525 (git)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/kasan/quarantine.c"
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          "vendor": "Linux",
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              "versionType": "semver"
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              "versionType": "semver"
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              "version": "7.2.4",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
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        }
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      "cpeApplicability": [
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          "nodes": [
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              "operator": "OR"
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      "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\u0027s 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\u0027s 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\u0027s 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\u0027s 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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-93208",
      "date": "2026-09-27",
      "epss": "0.00168",
      "percentile": "0.05392"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-28T04:06:27.000Z",
      "cve": "CVE-2026-93208",
      "id": "msrc_CVE-2026-93208",
      "initial_release_date": "2026-09-28T04:06:27.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "kasan: fix cache shrink race with CPU hotplug",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-93208.json",
      "version": "1"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "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": [
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                "defaultStatus": "affected",
                "product": "Linux",
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                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "lessThan": "5.19",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
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                    "versionType": "semver"
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                  {
                    "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"
                  },
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                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3-rc1",
                    "versionType": "original_commit_for_fix"
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                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
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        "cveTags": [],
        "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\u0027s 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\u0027s 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\u0027s 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\u0027s shrink list.  These lists are normally empty;\na non-empty list is traversed to remove objects belonging to the cache\nbeing shrunk or destroyed."
          }
        ],
        "id": "CVE-2026-93208",
        "lastModified": "2026-09-24T16:17:15.497",
        "metrics": {},
        "published": "2026-09-24T16:17:15.497",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/30e8cb8598aa41b1b9f8803081d2ae5e5369c0f3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3119d58e4ef8719d669911d38a53fc00086ac48b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/709c3646545e0a1f99a5816384c633f6552c5a98"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7cd164f0e1bab0f8dd125c92ed4f19bbd6b92a4a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8790303cbaac52a11dfed4aab261f8ea60682525"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-09-25T23:50:55Z",
      "cve": "CVE-2026-93208",
      "id": "CVE-2026-93208",
      "initial_release_date": "2026-09-24T23:50:08Z",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "239",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93208",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93208.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.