CVE-2026-23195 (GCVE-0-2026-23195)

Vulnerability from cvelistv5 – Published: 2026-02-14 16:27 – Updated: 2026-02-14 16:27
VLAI?
Title
cgroup/dmem: avoid pool UAF
Summary
In the Linux kernel, the following vulnerability has been resolved: cgroup/dmem: avoid pool UAF An UAF issue was observed: BUG: KASAN: slab-use-after-free in page_counter_uncharge+0x65/0x150 Write of size 8 at addr ffff888106715440 by task insmod/527 CPU: 4 UID: 0 PID: 527 Comm: insmod 6.19.0-rc7-next-20260129+ #11 Tainted: [O]=OOT_MODULE Call Trace: <TASK> dump_stack_lvl+0x82/0xd0 kasan_report+0xca/0x100 kasan_check_range+0x39/0x1c0 page_counter_uncharge+0x65/0x150 dmem_cgroup_uncharge+0x1f/0x260 Allocated by task 527: Freed by task 0: The buggy address belongs to the object at ffff888106715400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 64 bytes inside of freed 512-byte region [ffff888106715400, ffff888106715600) The buggy address belongs to the physical page: Memory state around the buggy address: ffff888106715300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888106715380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888106715400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888106715480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888106715500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb The issue occurs because a pool can still be held by a caller after its associated memory region is unregistered. The current implementation frees the pool even if users still hold references to it (e.g., before uncharge operations complete). This patch adds a reference counter to each pool, ensuring that a pool is only freed when its reference count drops to zero.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b168ed458ddecc176f3b9a1f4bcd83d7a4541c14 , < d3081353acaa6a638dcf75726066ea556a2de8d5 (git)
Affected: b168ed458ddecc176f3b9a1f4bcd83d7a4541c14 , < 99a2ef500906138ba58093b9893972a5c303c734 (git)
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    Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.10 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/cgroup/dmem.c"
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          "vendor": "Linux",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup/dmem: avoid pool UAF\n\nAn UAF issue was observed:\n\nBUG: KASAN: slab-use-after-free in page_counter_uncharge+0x65/0x150\nWrite of size 8 at addr ffff888106715440 by task insmod/527\n\nCPU: 4 UID: 0 PID: 527 Comm: insmod    6.19.0-rc7-next-20260129+ #11\nTainted: [O]=OOT_MODULE\nCall Trace:\n\u003cTASK\u003e\ndump_stack_lvl+0x82/0xd0\nkasan_report+0xca/0x100\nkasan_check_range+0x39/0x1c0\npage_counter_uncharge+0x65/0x150\ndmem_cgroup_uncharge+0x1f/0x260\n\nAllocated by task 527:\n\nFreed by task 0:\n\nThe buggy address belongs to the object at ffff888106715400\nwhich belongs to the cache kmalloc-512 of size 512\nThe buggy address is located 64 bytes inside of\nfreed 512-byte region [ffff888106715400, ffff888106715600)\n\nThe buggy address belongs to the physical page:\n\nMemory state around the buggy address:\nffff888106715300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\nffff888106715380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\n\u003effff888106715400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\t\t\t\t     ^\nffff888106715480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\nffff888106715500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\nThe issue occurs because a pool can still be held by a caller after its\nassociated memory region is unregistered. The current implementation frees\nthe pool even if users still hold references to it (e.g., before uncharge\noperations complete).\n\nThis patch adds a reference counter to each pool, ensuring that a pool is\nonly freed when its reference count drops to zero."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-14T16:27:21.621Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/d3081353acaa6a638dcf75726066ea556a2de8d5"
        },
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          "url": "https://git.kernel.org/stable/c/99a2ef500906138ba58093b9893972a5c303c734"
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      ],
      "title": "cgroup/dmem: avoid pool UAF",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23195",
    "datePublished": "2026-02-14T16:27:21.621Z",
    "dateReserved": "2026-01-13T15:37:45.985Z",
    "dateUpdated": "2026-02-14T16:27:21.621Z",
    "state": "PUBLISHED"
  },
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23195\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-02-14T17:15:57.337\",\"lastModified\":\"2026-02-14T17:15:57.337\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncgroup/dmem: avoid pool UAF\\n\\nAn UAF issue was observed:\\n\\nBUG: KASAN: slab-use-after-free in page_counter_uncharge+0x65/0x150\\nWrite of size 8 at addr ffff888106715440 by task insmod/527\\n\\nCPU: 4 UID: 0 PID: 527 Comm: insmod    6.19.0-rc7-next-20260129+ #11\\nTainted: [O]=OOT_MODULE\\nCall Trace:\\n\u003cTASK\u003e\\ndump_stack_lvl+0x82/0xd0\\nkasan_report+0xca/0x100\\nkasan_check_range+0x39/0x1c0\\npage_counter_uncharge+0x65/0x150\\ndmem_cgroup_uncharge+0x1f/0x260\\n\\nAllocated by task 527:\\n\\nFreed by task 0:\\n\\nThe buggy address belongs to the object at ffff888106715400\\nwhich belongs to the cache kmalloc-512 of size 512\\nThe buggy address is located 64 bytes inside of\\nfreed 512-byte region [ffff888106715400, ffff888106715600)\\n\\nThe buggy address belongs to the physical page:\\n\\nMemory state around the buggy address:\\nffff888106715300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\\nffff888106715380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc\\n\u003effff888106715400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n\\t\\t\\t\\t     ^\\nffff888106715480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\nffff888106715500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n\\nThe issue occurs because a pool can still be held by a caller after its\\nassociated memory region is unregistered. The current implementation frees\\nthe pool even if users still hold references to it (e.g., before uncharge\\noperations complete).\\n\\nThis patch adds a reference counter to each pool, ensuring that a pool is\\nonly freed when its reference count drops to zero.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/99a2ef500906138ba58093b9893972a5c303c734\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d3081353acaa6a638dcf75726066ea556a2de8d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Sightings

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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.



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