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CVE-2026-74321

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.5 · Élevée
EPSS 0.7%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <9faa6b69ad73f03c7bde53e07d75a28822dc9a1a, 4.20, <65770111a2d47c2b15e20b2ba92bb12198f289d4, 0, <=7.1.*, <4.20, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, <015dc4a1e0c2cba551d4620eba13d26d5081dc34, 0110a4c43451533de1ea1bbdc57b5d452f9d8b25, <ba9fa2ff5981589bb49094d3358c339b37c47f53, <a71143590ce9764dbcb47617647592ff8b4d48bc, <=6.18.*, 5.15.212, 6.6.145, 5.10.261, <c372ca227e16bace86f1df1fa4ae6849e2fcfa28, <=*, <=5.15.*, <486f8298b6188ff11ef1f4be7f1d5d2e4d1b1fae, <3b15d02be05e74321adb1e0ae0cb4ccfba7c6cb1, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix invalid pointer dereference in __btrfs_run_delayed_refs() In the beginning of the loop, we try to obtain a locked delayed ref head, if 'locked_ref' is currently NULL, by calling btrfs_select_ref_head(), which can return an error pointer. If the error pointer is -EAGAIN we do a continue and go back to the beginning of the loop, which will not try again to call btrfs_select_ref_head() since 'locked_ref' is no longer NULL but it's ERR_PTR(-EAGAIN), and then we do: spin_lock(&locked_ref->lock); against a ERR_PTR(-EAGAIN) value, generating an invalid pointer dereference. Fix this by ensuring that 'locked_ref' is set to NULL when btrfs_select_ref_head() returns ERR_PTR(-EAGAIN) and incrementing 'count' as well, to prevent infinite looping. We do this by doing a goto to the bottom of the loop that already sets 'locked_ref' to NULL and does a cond_resched(), with an increment to 'count' right before the goto. These measures were in place before the refactoring in commit 0110a4c43451 ("btrfs: refactor __btrfs_run_delayed_refs loop") but were unintentionally lost afterwards.

Gravité et risque d'exploitation

CVE-2026-74321 obtient un score CVSS de 7.5/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.72 %, ce qui la place devant 52.9 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <9faa6b69ad73f03c7bde53e07d75a28822dc9a1a, 4.20, <65770111a2d47c2b15e20b2ba92bb12198f289d4, 0, <=7.1.*, <4.20, 6.1.178, <=5.10.*, <=6.6.*, 6.12.97, <015dc4a1e0c2cba551d4620eba13d26d5081dc34, 0110a4c43451533de1ea1bbdc57b5d452f9d8b25, <ba9fa2ff5981589bb49094d3358c339b37c47f53, <a71143590ce9764dbcb47617647592ff8b4d48bc, <=6.18.*, 5.15.212, 6.6.145, 5.10.261, <c372ca227e16bace86f1df1fa4ae6849e2fcfa28, <=*, <=5.15.*, <486f8298b6188ff11ef1f4be7f1d5d2e4d1b1fae, <3b15d02be05e74321adb1e0ae0cb4ccfba7c6cb1, 7.2) 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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