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CVE-2024-26685

Vulnérabilité moyenne dans Linux (Linux)

CVSS 5.5 · Moyenne
EPSS 0.3%
Linux•Linux•Versions : 6.6.18, <=6.1.*, 831c87640d23ccb253a02e4901bd9a325b5e8c2d, <8fa90634ec3e9cc50f42dd605eec60f2d146ced8, <c4a09fdac625e64abe478dcf88bfa20406616928, 3.2.52, <3.11, 0, <5bc09b397cbf1221f8a8aacb1152650c9195b02b, 3.12, 6.8, <3.3, 3.11.5, <626daab3811b772086aef1bf8eed3ffe6f523eff, 8f67918af09fc0ffd426a9b6f87697976d3fbc7b, <2c3bdba00283a6c7a5b19481a59a730f46063803, <=5.10.*, <=6.6.*, <d31c8721e816eff5ca6573cc487754f357c093cd, <f3e4963566f58726d3265a727116a42b591f6596, 5.15.149, <=5.4.*, <3.5, <=4.19.*, 3.10.16, 4.19.307, 5.4.269, 6.1.79, 5.10.210, 6.7.6, <3.12, 3.4.83, <=*, <=5.15.*, <=6.7.*, <6589f0f72f8edd1fa11adce4eedbd3615f2e78ab, ccebcc74c81d8399c7b204aea47c1f33b09c2b17, 7f42ec3941560f0902fe3671e36f2c20ffd3af0a, d8974c7fe717ee8fb0706e35cc92e0bcdf660ec5

Description

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.

Gravité et risque d'exploitation

CVE-2024-26685 obtient un score CVSS de 5.5/10, soit une gravité moyenne. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.25 %, ce qui la place devant 15.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.6.18, <=6.1.*, 831c87640d23ccb253a02e4901bd9a325b5e8c2d, <8fa90634ec3e9cc50f42dd605eec60f2d146ced8, <c4a09fdac625e64abe478dcf88bfa20406616928, 3.2.52, <3.11, 0, <5bc09b397cbf1221f8a8aacb1152650c9195b02b, 3.12, 6.8, <3.3, 3.11.5, <626daab3811b772086aef1bf8eed3ffe6f523eff, 8f67918af09fc0ffd426a9b6f87697976d3fbc7b, <2c3bdba00283a6c7a5b19481a59a730f46063803, <=5.10.*, <=6.6.*, <d31c8721e816eff5ca6573cc487754f357c093cd, <f3e4963566f58726d3265a727116a42b591f6596, 5.15.149, <=5.4.*, <3.5, <=4.19.*, 3.10.16, 4.19.307, 5.4.269, 6.1.79, 5.10.210, 6.7.6, <3.12, 3.4.83, <=*, <=5.15.*, <=6.7.*, <6589f0f72f8edd1fa11adce4eedbd3615f2e78ab, ccebcc74c81d8399c7b204aea47c1f33b09c2b17, 7f42ec3941560f0902fe3671e36f2c20ffd3af0a, d8974c7fe717ee8fb0706e35cc92e0bcdf660ec5) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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