CVE-2025-40233 (GCVE-0-2025-40233)
Vulnerability from cvelistv5
Published
2025-12-04 15:31
Modified
2025-12-04 15:31
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: clear extent cache after moving/defragmenting extents The extent map cache can become stale when extents are moved or defragmented, causing subsequent operations to see outdated extent flags. This triggers a BUG_ON in ocfs2_refcount_cal_cow_clusters(). The problem occurs when: 1. copy_file_range() creates a reflinked extent with OCFS2_EXT_REFCOUNTED 2. ioctl(FITRIM) triggers ocfs2_move_extents() 3. __ocfs2_move_extents_range() reads and caches the extent (flags=0x2) 4. ocfs2_move_extent()/ocfs2_defrag_extent() calls __ocfs2_move_extent() which clears OCFS2_EXT_REFCOUNTED flag on disk (flags=0x0) 5. The extent map cache is not invalidated after the move 6. Later write() operations read stale cached flags (0x2) but disk has updated flags (0x0), causing a mismatch 7. BUG_ON(!(rec->e_flags & OCFS2_EXT_REFCOUNTED)) triggers Fix by clearing the extent map cache after each extent move/defrag operation in __ocfs2_move_extents_range(). This ensures subsequent operations read fresh extent data from disk.
References
Impacted products
Vendor Product Version
Linux Linux Version: 53069d4e76954e2e63c1b3c501051c6fbcf7298c
Version: 53069d4e76954e2e63c1b3c501051c6fbcf7298c
Version: 53069d4e76954e2e63c1b3c501051c6fbcf7298c
Version: 53069d4e76954e2e63c1b3c501051c6fbcf7298c
Version: 53069d4e76954e2e63c1b3c501051c6fbcf7298c
Version: 53069d4e76954e2e63c1b3c501051c6fbcf7298c
Version: 53069d4e76954e2e63c1b3c501051c6fbcf7298c
Version: 53069d4e76954e2e63c1b3c501051c6fbcf7298c
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/move_extents.c"
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          "vendor": "Linux",
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              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: clear extent cache after moving/defragmenting extents\n\nThe extent map cache can become stale when extents are moved or\ndefragmented, causing subsequent operations to see outdated extent flags. \nThis triggers a BUG_ON in ocfs2_refcount_cal_cow_clusters().\n\nThe problem occurs when:\n1. copy_file_range() creates a reflinked extent with OCFS2_EXT_REFCOUNTED\n2. ioctl(FITRIM) triggers ocfs2_move_extents()\n3. __ocfs2_move_extents_range() reads and caches the extent (flags=0x2)\n4. ocfs2_move_extent()/ocfs2_defrag_extent() calls __ocfs2_move_extent()\n   which clears OCFS2_EXT_REFCOUNTED flag on disk (flags=0x0)\n5. The extent map cache is not invalidated after the move\n6. Later write() operations read stale cached flags (0x2) but disk has\n   updated flags (0x0), causing a mismatch\n7. BUG_ON(!(rec-\u003ee_flags \u0026 OCFS2_EXT_REFCOUNTED)) triggers\n\nFix by clearing the extent map cache after each extent move/defrag\noperation in __ocfs2_move_extents_range().  This ensures subsequent\noperations read fresh extent data from disk."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-04T15:31:23.891Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
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      "title": "ocfs2: clear extent cache after moving/defragmenting extents",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40233",
    "datePublished": "2025-12-04T15:31:23.891Z",
    "dateReserved": "2025-04-16T07:20:57.180Z",
    "dateUpdated": "2025-12-04T15:31:23.891Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40233\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-04T16:16:16.137\",\"lastModified\":\"2025-12-04T17:15:08.283\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nocfs2: clear extent cache after moving/defragmenting extents\\n\\nThe extent map cache can become stale when extents are moved or\\ndefragmented, causing subsequent operations to see outdated extent flags. \\nThis triggers a BUG_ON in ocfs2_refcount_cal_cow_clusters().\\n\\nThe problem occurs when:\\n1. copy_file_range() creates a reflinked extent with OCFS2_EXT_REFCOUNTED\\n2. ioctl(FITRIM) triggers ocfs2_move_extents()\\n3. __ocfs2_move_extents_range() reads and caches the extent (flags=0x2)\\n4. ocfs2_move_extent()/ocfs2_defrag_extent() calls __ocfs2_move_extent()\\n   which clears OCFS2_EXT_REFCOUNTED flag on disk (flags=0x0)\\n5. The extent map cache is not invalidated after the move\\n6. Later write() operations read stale cached flags (0x2) but disk has\\n   updated flags (0x0), causing a mismatch\\n7. BUG_ON(!(rec-\u003ee_flags \u0026 OCFS2_EXT_REFCOUNTED)) triggers\\n\\nFix by clearing the extent map cache after each extent move/defrag\\noperation in __ocfs2_move_extents_range().  This ensures subsequent\\noperations read fresh extent data from disk.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/78a63493f8e352296dbc7cb7b3f4973105e8679e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/93166bc53c0e3587058327a4121daea34b4fecd5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/93b1ab422f1966b71561158e1aedce4ec100f357\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a21750df2f6169af6e039a3bb4893d6c9564e48d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7ee72286efba1d407c6f15a0528e43593fb7007\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa6a21409dd6221bb268b56bb410e031c632ff9a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb69928ed578f881e68d26aaf1a8f6e7faab3b44\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e92af7737a94a729225d2a5d180eaaa77fe0bbc1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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