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CVE-2026-74365

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.3 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <5.11, <=6.1.*, 6.18.40, <=6.12.*, 7.1.5, 7.2, <4eafa810b042d985ec6bbf5b514414e73cee6f6f, 6f50b414f1a0d790f11a6438a3ad6d0577eb2c18, 6.6.2, <73e35c1bdfa160b41fdbe204e02325f0687de506, <5c53406098b599c420b031e6ec5ba8a2f3794c50, 36c75ce3bd299878fd9b238e9803d3817ddafbf3, <417918783bcfe0be135019df16a267b3af442efd, 6.5.12, 0, 6.1.63, <=7.1.*, 5.4.261, 40ba3fa21250e361bdd8f00800b3e2cb6160de95, 66eb7b7f23dd9aec5356e7054dd3596ae7648ff5, b0e7a935739f33ed2bd6868b89f97dd4c2683c26, 2577fece583c7c05cda7ad50dde7638c962665e1, 5.10.201, <6.6, <4.20, 6.1.178, 6.12.97, <=6.6.*, <6.1.178, <fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735, 5.15.139, <5.5, <5.16, <=6.18.*, b27751fb1f271bbb78d5993c0b10011628e40e18, 6.6.145, <6.7, <6.6.145, <8d4b989d9c9afe5f185aa5853b666fc4617afe9e, <=*, 6.7, f23859748e3d530217b197e146a9ac84faf0a282, 4.19.299

Description

In the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: Handle preemption in BTT lane acquisition BTT lanes serialize access to per-lane metadata and workspace state during BTT I/O. The btt-check unit test reports data mismatches during BTT writes due to a race in lane acquisition that can lead to silent data corruption. The existing lane model uses a spinlock together with a per-CPU recursion count. That recursion model stopped being valid after BTT lanes became preemptible: another task can run on the same CPU, observe a non-zero recursion count, bypass locking, and use the same lane concurrently. BTT lanes are also held across arena_write_bytes() calls. That path reaches nsio_rw_bytes(), which flushes writes with nvdimm_flush(). Some provider flush callbacks can sleep, making a spinlock the wrong primitive for the lane lifetime. Replace the spinlock-based recursion model with a dynamically allocated per-lane mutex array and take the lane lock unconditionally. Add might_sleep() to catch any future atomic-context caller. Found with the ndctl unit test btt-check.sh.

Gravité et risque d'exploitation

CVE-2026-74365 obtient un score CVSS de 7.3/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.13 %, ce qui la place devant 2.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <5.11, <=6.1.*, 6.18.40, <=6.12.*, 7.1.5, 7.2, <4eafa810b042d985ec6bbf5b514414e73cee6f6f, 6f50b414f1a0d790f11a6438a3ad6d0577eb2c18, 6.6.2, <73e35c1bdfa160b41fdbe204e02325f0687de506, <5c53406098b599c420b031e6ec5ba8a2f3794c50, 36c75ce3bd299878fd9b238e9803d3817ddafbf3, <417918783bcfe0be135019df16a267b3af442efd, 6.5.12, 0, 6.1.63, <=7.1.*, 5.4.261, 40ba3fa21250e361bdd8f00800b3e2cb6160de95, 66eb7b7f23dd9aec5356e7054dd3596ae7648ff5, b0e7a935739f33ed2bd6868b89f97dd4c2683c26, 2577fece583c7c05cda7ad50dde7638c962665e1, 5.10.201, <6.6, <4.20, 6.1.178, 6.12.97, <=6.6.*, <6.1.178, <fd7a97b2514cfc4b4cc067a27dd39bde2a8b1735, 5.15.139, <5.5, <5.16, <=6.18.*, b27751fb1f271bbb78d5993c0b10011628e40e18, 6.6.145, <6.7, <6.6.145, <8d4b989d9c9afe5f185aa5853b666fc4617afe9e, <=*, 6.7, f23859748e3d530217b197e146a9ac84faf0a282, 4.19.299) 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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