CVE-2026-93140 (GCVE-0-2026-93140)
Vulnerability from cvelistv5
Published
2026-09-17 16:11
Modified
2026-10-19 09:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: udf: Mark LVID buffer as uptodate before marking it dirty When an I/O error occurs while writing the Logical Volume Integrity Descriptor (LVID) buffer to the block device, the block layer's completion handler (`end_buffer_write_sync()`) clears the `BH_Uptodate` flag on the buffer. However, the buffer still contains valid LVID data in memory. If the filesystem is subsequently remounted read-write or synced, `udf_open_lvid()` or `udf_sync_fs()` will modify the LVID buffer and call `mark_buffer_dirty()`. This triggers a spurious `WARN_ON_ONCE(!buffer_uptodate(bh))` warning in `mark_buffer_dirty()` because the buffer is not marked uptodate, even though its in-memory contents are valid and are about to be overwritten. To prevent this spurious warning, unconditionally set the `BH_Uptodate` flag before calling `mark_buffer_dirty()` in `udf_open_lvid()` and `udf_sync_fs()`. This acknowledges that the in-memory buffer is valid and matches the workaround previously applied to `udf_close_lvid()` in commit 853a0c25baf9 ("udf: Mark LVID buffer as uptodate before marking it dirty"). Extending this workaround ensures consistent behavior across all LVID updates. Buffer I/O error on dev loop0, logical block 128, lost sync page write ------------[ cut here ]------------ !buffer_uptodate(bh) WARNING: fs/buffer.c:1087 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1087 ... Call Trace: <TASK> udf_open_lvid+0x369/0x5b0 fs/udf/super.c:2078 udf_reconfigure+0x336/0x540 fs/udf/super.c:679 reconfigure_super+0x232/0x8f0 fs/super.c:1080 vfs_cmd_reconfigure fs/fsopen.c:268 [inline] vfs_fsconfig_locked+0x171/0x320 fs/fsopen.c:297 __do_sys_fsconfig fs/fsopen.c:463 [inline] __se_sys_fsconfig+0x6b9/0x810 fs/fsopen.c:350 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 </TASK>
References
Impacted products
Vendor Product Version
Linux Linux Version: 853a0c25baf96b028de1654bea1e0c8857eadf3d
Version: 853a0c25baf96b028de1654bea1e0c8857eadf3d
Version: 853a0c25baf96b028de1654bea1e0c8857eadf3d
Version: 853a0c25baf96b028de1654bea1e0c8857eadf3d
Version: 853a0c25baf96b028de1654bea1e0c8857eadf3d
Version: 853a0c25baf96b028de1654bea1e0c8857eadf3d
Version: 853a0c25baf96b028de1654bea1e0c8857eadf3d
Version: 853a0c25baf96b028de1654bea1e0c8857eadf3d
Version: c7da4ed95a78e38fdaffb06eaf1a3f3318b1add6
Version: c005218328597211008a4d33a91e2952798e3556
Version: 1357ed0b4b9db30846377febb40a847d6103c991
Version: 43f4a516b2f5492bc597f3753b693ad8adc62748
Version: 2.6.27.62   ≤
Version: 2.6.32.57   ≤
Version: 3.0.21   ≤
Version: 3.2.6   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: Mark LVID buffer as uptodate before marking it dirty\n\nWhen an I/O error occurs while writing the Logical Volume Integrity\nDescriptor (LVID) buffer to the block device, the block layer\u0027s completion\nhandler (`end_buffer_write_sync()`) clears the `BH_Uptodate` flag on the\nbuffer. However, the buffer still contains valid LVID data in memory. If\nthe filesystem is subsequently remounted read-write or synced,\n`udf_open_lvid()` or `udf_sync_fs()` will modify the LVID buffer and call\n`mark_buffer_dirty()`. This triggers a spurious\n`WARN_ON_ONCE(!buffer_uptodate(bh))` warning in `mark_buffer_dirty()`\nbecause the buffer is not marked uptodate, even though its in-memory\ncontents are valid and are about to be overwritten.\n\nTo prevent this spurious warning, unconditionally set the `BH_Uptodate`\nflag before calling `mark_buffer_dirty()` in `udf_open_lvid()` and\n`udf_sync_fs()`. This acknowledges that the in-memory buffer is valid and\nmatches the workaround previously applied to `udf_close_lvid()` in commit\n853a0c25baf9 (\"udf: Mark LVID buffer as uptodate before marking it dirty\").\nExtending this workaround ensures consistent behavior across all LVID\nupdates.\n\nBuffer I/O error on dev loop0, logical block 128, lost sync page write\n------------[ cut here ]------------\n!buffer_uptodate(bh)\nWARNING: fs/buffer.c:1087 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1087\n...\nCall Trace:\n \u003cTASK\u003e\n udf_open_lvid+0x369/0x5b0 fs/udf/super.c:2078\n udf_reconfigure+0x336/0x540 fs/udf/super.c:679\n reconfigure_super+0x232/0x8f0 fs/super.c:1080\n vfs_cmd_reconfigure fs/fsopen.c:268 [inline]\n vfs_fsconfig_locked+0x171/0x320 fs/fsopen.c:297\n __do_sys_fsconfig fs/fsopen.c:463 [inline]\n __se_sys_fsconfig+0x6b9/0x810 fs/fsopen.c:350\n do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94\n \u003c/TASK\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:06:12.969Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e6461ef34f91ad7dbffdf912b3d661a7dd892931"
        },
        {
          "url": "https://git.kernel.org/stable/c/359cea636f4a74a96c01a8050f155e12840c079a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4c4e38b356ad4c1f90478124922917489137c08"
        },
        {
          "url": "https://git.kernel.org/stable/c/8034ddf4751d9143c5ef7eebe3d4f33218fdd378"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee477e5204f764444e60699280abf5936c2a6ae6"
        },
        {
          "url": "https://git.kernel.org/stable/c/11afe1912140f79d5af3091a54b181ef72fce1a5"
        },
        {
          "url": "https://git.kernel.org/stable/c/c4058355d27488a3cd31c60c032335f77c4fdcfc"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb0601134c7e51728bd098abc6909315de1e5d86"
        }
      ],
      "title": "udf: Mark LVID buffer as uptodate before marking it dirty",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93140",
    "datePublished": "2026-09-17T16:11:40.099Z",
    "dateReserved": "2026-09-17T16:02:15.088Z",
    "dateUpdated": "2026-10-19T09:06:12.969Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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