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CVE-2024-56780

Vulnérabilité moyenne dans Linux (Linux)

CVSS 5.5 · Moyenne
EPSS 0.2%
Linux•Linux•Versions : 6.13, <=6.1.*, <8ea87e34792258825d290f4dc5216276e91cb224, <=6.12.*, d40c192e119892799dd4ddf94f5cea6fa93775ef, 31bed65eecbc5ce57592cfe31947eaa64e3d678e, <6.1.120, <6.5, 0, 86d89987f0998c98f57d641e308b40452a994045, 903fc5d8cb48b0d2de7095ef40e39fd32bb27bd0, 6.1.120, 6.12.4, 5.10.231, 5.15.174, 6.6.64, <ac6f420291b3fee1113f21d612fa88b628afab5b, 4.19.295, <6.6, 89602de9a2d7080b7a4029d5c1bf8f78d295ff5f, <4.20, <3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb, f3e9a2bbdeb8987508dd6bb2b701dea911d4daec, 6.5.3, <=5.10.*, <=6.6.*, <ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb, 6.4.16, 5.4.257, dabc8b20756601b9e1cc85a81d47d3f98ed4d13a, <bcacb52a985f1b6d280f698a470b873dfe52728a, 6.6, <=5.4.*, <5.15.174, <6f3821acd7c3143145999248087de5fb4b48cf26, 5.15.132, <5.10.231, 5.10.195, <=*, <=5.15.*, 5.4.287, 3027e200dd58d5b437f16634dbbd355b29ffe0a6, <a5abba5e0e586e258ded3e798fe5f69c66fec198, 6.1.53, <5.4.287

Description

In the Linux kernel, the following vulnerability has been resolved: quota: flush quota_release_work upon quota writeback One of the paths quota writeback is called from is: freeze_super() sync_filesystem() ext4_sync_fs() dquot_writeback_dquots() Since we currently don't always flush the quota_release_work queue in this path, we can end up with the following race: 1. dquot are added to releasing_dquots list during regular operations. 2. FS Freeze starts, however, this does not flush the quota_release_work queue. 3. Freeze completes. 4. Kernel eventually tries to flush the workqueue while FS is frozen which hits a WARN_ON since transaction gets started during frozen state: ext4_journal_check_start+0x28/0x110 [ext4] (unreliable) __ext4_journal_start_sb+0x64/0x1c0 [ext4] ext4_release_dquot+0x90/0x1d0 [ext4] quota_release_workfn+0x43c/0x4d0 Which is the following line: WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE); Which ultimately results in generic/390 failing due to dmesg noise. This was detected on powerpc machine 15 cores. To avoid this, make sure to flush the workqueue during dquot_writeback_dquots() so we dont have any pending workitems after freeze.

Gravité et risque d'exploitation

CVE-2024-56780 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 0.22 %, ce qui la place devant 11.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.13, <=6.1.*, <8ea87e34792258825d290f4dc5216276e91cb224, <=6.12.*, d40c192e119892799dd4ddf94f5cea6fa93775ef, 31bed65eecbc5ce57592cfe31947eaa64e3d678e, <6.1.120, <6.5, 0, 86d89987f0998c98f57d641e308b40452a994045, 903fc5d8cb48b0d2de7095ef40e39fd32bb27bd0, 6.1.120, 6.12.4, 5.10.231, 5.15.174, 6.6.64, <ac6f420291b3fee1113f21d612fa88b628afab5b, 4.19.295, <6.6, 89602de9a2d7080b7a4029d5c1bf8f78d295ff5f, <4.20, <3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb, f3e9a2bbdeb8987508dd6bb2b701dea911d4daec, 6.5.3, <=5.10.*, <=6.6.*, <ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb, 6.4.16, 5.4.257, dabc8b20756601b9e1cc85a81d47d3f98ed4d13a, <bcacb52a985f1b6d280f698a470b873dfe52728a, 6.6, <=5.4.*, <5.15.174, <6f3821acd7c3143145999248087de5fb4b48cf26, 5.15.132, <5.10.231, 5.10.195, <=*, <=5.15.*, 5.4.287, 3027e200dd58d5b437f16634dbbd355b29ffe0a6, <a5abba5e0e586e258ded3e798fe5f69c66fec198, 6.1.53, <5.4.287) 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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