CVE-2024-26685 (GCVE-0-2024-26685)

Vulnerability from cvelistv5 – Published: 2024-04-03 14:54 – Updated: 2026-05-11 20:02
VLAI?
Title
nilfs2: fix potential bug in end_buffer_async_write
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential bug in end_buffer_async_write According to a syzbot report, end_buffer_async_write(), which handles the completion of block device writes, may detect abnormal condition of the buffer async_write flag and cause a BUG_ON failure when using nilfs2. Nilfs2 itself does not use end_buffer_async_write(). But, the async_write flag is now used as a marker by commit 7f42ec394156 ("nilfs2: fix issue with race condition of competition between segments for dirty blocks") as a means of resolving double list insertion of dirty blocks in nilfs_lookup_dirty_data_buffers() and nilfs_lookup_node_buffers() and the resulting crash. This modification is safe as long as it is used for file data and b-tree node blocks where the page caches are independent. However, it was irrelevant and redundant to also introduce async_write for segment summary and super root blocks that share buffers with the backing device. This led to the possibility that the BUG_ON check in end_buffer_async_write would fail as described above, if independent writebacks of the backing device occurred in parallel. The use of async_write for segment summary buffers has already been removed in a previous change. Fix this issue by removing the manipulation of the async_write flag for the remaining super root block buffer.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7f42ec3941560f0902fe3671e36f2c20ffd3af0a , < c4a09fdac625e64abe478dcf88bfa20406616928 (git)
Affected: 7f42ec3941560f0902fe3671e36f2c20ffd3af0a , < d31c8721e816eff5ca6573cc487754f357c093cd (git)
Affected: 7f42ec3941560f0902fe3671e36f2c20ffd3af0a , < f3e4963566f58726d3265a727116a42b591f6596 (git)
Affected: 7f42ec3941560f0902fe3671e36f2c20ffd3af0a , < 8fa90634ec3e9cc50f42dd605eec60f2d146ced8 (git)
Affected: 7f42ec3941560f0902fe3671e36f2c20ffd3af0a , < 6589f0f72f8edd1fa11adce4eedbd3615f2e78ab (git)
Affected: 7f42ec3941560f0902fe3671e36f2c20ffd3af0a , < 2c3bdba00283a6c7a5b19481a59a730f46063803 (git)
Affected: 7f42ec3941560f0902fe3671e36f2c20ffd3af0a , < 626daab3811b772086aef1bf8eed3ffe6f523eff (git)
Affected: 7f42ec3941560f0902fe3671e36f2c20ffd3af0a , < 5bc09b397cbf1221f8a8aacb1152650c9195b02b (git)
Affected: ccebcc74c81d8399c7b204aea47c1f33b09c2b17 (git)
Affected: 831c87640d23ccb253a02e4901bd9a325b5e8c2d (git)
Affected: d8974c7fe717ee8fb0706e35cc92e0bcdf660ec5 (git)
Affected: 8f67918af09fc0ffd426a9b6f87697976d3fbc7b (git)
Create a notification for this product.
Linux Linux Affected: 3.12
Unaffected: 0 , < 3.12 (semver)
Unaffected: 4.19.307 , ≤ 4.19.* (semver)
Unaffected: 5.4.269 , ≤ 5.4.* (semver)
Unaffected: 5.10.210 , ≤ 5.10.* (semver)
Unaffected: 5.15.149 , ≤ 5.15.* (semver)
Unaffected: 6.1.79 , ≤ 6.1.* (semver)
Unaffected: 6.6.18 , ≤ 6.6.* (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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But, the async_write\\nflag is now used as a marker by commit 7f42ec394156 (\\\"nilfs2: fix issue\\nwith race condition of competition between segments for dirty blocks\\\") as\\na means of resolving double list insertion of dirty blocks in\\nnilfs_lookup_dirty_data_buffers() and nilfs_lookup_node_buffers() and the\\nresulting crash.\\n\\nThis modification is safe as long as it is used for file data and b-tree\\nnode blocks where the page caches are independent.  However, it was\\nirrelevant and redundant to also introduce async_write for segment summary\\nand super root blocks that share buffers with the backing device.  This\\nled to the possibility that the BUG_ON check in end_buffer_async_write\\nwould fail as described above, if independent writebacks of the backing\\ndevice occurred in parallel.\\n\\nThe use of async_write for segment summary buffers has already been\\nremoved in a previous change.\\n\\nFix this issue by removing the manipulation of the async_write flag for\\nthe remaining super root block buffer.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nilfs2: corrige un posible error en end_buffer_async_write Seg\u00fan un informe de syzbot, end_buffer_async_write(), que maneja la finalizaci\u00f3n de las escrituras del dispositivo de bloque, puede detectar una condici\u00f3n anormal del indicador async_write del b\u00fafer y causar un Error BUG_ON al usar nilfs2. Nilfs2 en s\u00ed no usa end_buffer_async_write(). Pero el indicador async_write ahora se usa como marcador en el commit 7f42ec394156 (\\\"nilfs2: soluciona el problema con la condici\u00f3n de ejecuci\u00f3n de competencia entre segmentos por bloques sucios\\\") como un medio para resolver la inserci\u00f3n de lista doble de bloques sucios en nilfs_lookup_dirty_data_buffers() y nilfs_lookup_node_buffers( ) y el accidente resultante. Esta modificaci\u00f3n es segura siempre que se utilice para datos de archivos y bloques de nodos de \u00e1rbol b donde las cach\u00e9s de p\u00e1ginas sean independientes. Sin embargo, era irrelevante y redundante introducir tambi\u00e9n async_write para el resumen de segmento y los bloques s\u00faper ra\u00edz que comparten buffers con el dispositivo de respaldo. Esto gener\u00f3 la posibilidad de que la verificaci\u00f3n BUG_ON en end_buffer_async_write fallara como se describe anteriormente, si se produjeran reescrituras independientes del dispositivo de respaldo en paralelo. El uso de async_write para buffers de resumen de segmentos ya se elimin\u00f3 en un cambio anterior. 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[\"fs/nilfs2/segment.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c4a09fdac625e64abe478dcf88bfa20406616928\"}, {\"url\": \"https://git.kernel.org/stable/c/d31c8721e816eff5ca6573cc487754f357c093cd\"}, {\"url\": \"https://git.kernel.org/stable/c/f3e4963566f58726d3265a727116a42b591f6596\"}, {\"url\": \"https://git.kernel.org/stable/c/8fa90634ec3e9cc50f42dd605eec60f2d146ced8\"}, {\"url\": \"https://git.kernel.org/stable/c/6589f0f72f8edd1fa11adce4eedbd3615f2e78ab\"}, {\"url\": \"https://git.kernel.org/stable/c/2c3bdba00283a6c7a5b19481a59a730f46063803\"}, {\"url\": \"https://git.kernel.org/stable/c/626daab3811b772086aef1bf8eed3ffe6f523eff\"}, {\"url\": \"https://git.kernel.org/stable/c/5bc09b397cbf1221f8a8aacb1152650c9195b02b\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnilfs2: fix potential bug in end_buffer_async_write\\n\\nAccording to a syzbot report, end_buffer_async_write(), which handles the\\ncompletion of block device writes, may detect abnormal condition of the\\nbuffer async_write flag and cause a BUG_ON failure when using nilfs2.\\n\\nNilfs2 itself does not use end_buffer_async_write().  But, the async_write\\nflag is now used as a marker by commit 7f42ec394156 (\\\"nilfs2: fix issue\\nwith race condition of competition between segments for dirty blocks\\\") as\\na means of resolving double list insertion of dirty blocks in\\nnilfs_lookup_dirty_data_buffers() and nilfs_lookup_node_buffers() and the\\nresulting crash.\\n\\nThis modification is safe as long as it is used for file data and b-tree\\nnode blocks where the page caches are independent.  However, it was\\nirrelevant and redundant to also introduce async_write for segment summary\\nand super root blocks that share buffers with the backing device.  This\\nled to the possibility that the BUG_ON check in end_buffer_async_write\\nwould fail as described above, if independent writebacks of the backing\\ndevice occurred in parallel.\\n\\nThe use of async_write for segment summary buffers has already been\\nremoved in a previous change.\\n\\nFix this issue by removing the manipulation of the async_write flag for\\nthe remaining super root block buffer.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.307\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.269\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.210\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.149\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.79\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.18\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.6\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"3.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.2.52\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.4.83\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.10.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.11.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:02:13.157Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26685\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:02:13.157Z\", \"dateReserved\": \"2024-02-19T14:20:24.153Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-03T14:54:47.688Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.




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.



Detection rules are retrieved from Rulezet.