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CVE-2026-74463

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <cc111696ef420f6bb552b2526530067977f0b406, <14429dc1c756c35e106f01ff09cadccb82f5531d, 0, <4.1, <=7.1.*, <aa1944b52d6492c48bdd17046578aa0d953546e6, 5.15.216, 6.12.103, <=5.10.*, <=6.6.*, <f96a719d9f8a797105ec5cacf568ab128e33391f, 6.1.183, <deffad5bb4f8b4f09e46252f24754ddc9960b244, <=6.18.*, ba92222ed63a12d09120df9b92f56cc990abac19, <19b783335d62e7a2367436a6e1f1b37da1878360, 4.1, <=*, <d99607c888f26e8a4e9fe9772860cef4aff86bb4, <=5.15.*, 7.1.8, <b6cb47e186abba85a3b08aa3023067ab82577286, 6.18.44, 6.6.151, 5.10.265, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: i2c: jz4780: Cache host clock rate at probe to prevent CCF prepare_lock deadlock Fix a severe AB/BA deadlock between the Common Clock Framework (CCF) and the I2C adapter lock, which triggers when an I2C-controlled clock generator client (like the Si5351) is registered or modified under the CCF. During an i2c client clock (generator) frequency change, the CCF acquires its global 'prepare_lock' mutex and the driver calls i2c_transfer() to update the client's chip registers, stalling for the adapter's I2C bus lock. Concurrently, an independent, parallel transfer on the same bus (e.g., a GPIO expander handling LEDs) can hold the I2C adapter lock. Inside this parallel transfer path, jz4780_i2c_set_speed() calls clk_get_rate() on the host controller's input clock to calculate bus timings. This call attempts to acquire the blocked CCF 'prepare_lock', creating a circular dependency that freezes the system. The jz4780 host controller clock itself is static and never changes at runtime. However, calling clk_get_rate() inside the active transfer path introduces an unnecessary dependency on the CCF internal locks. Eliminate this synchronous clk_get_rate() call from the active transfer path by caching the static host peripheral clock rate once - inside the private jz4780_i2c structure during jz4780_i2c_probe(). Update jz4780_i2c_set_speed() to use this cached value, safely decoupling active I2C transactions from the CCF internal locks without any risk of stale timings. Assisted-by web based Google AI (pinpointing the bug and writing the message).

Gravité et risque d'exploitation

CVE-2026-74463 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.22 %, ce qui la place devant 11.7 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <cc111696ef420f6bb552b2526530067977f0b406, <14429dc1c756c35e106f01ff09cadccb82f5531d, 0, <4.1, <=7.1.*, <aa1944b52d6492c48bdd17046578aa0d953546e6, 5.15.216, 6.12.103, <=5.10.*, <=6.6.*, <f96a719d9f8a797105ec5cacf568ab128e33391f, 6.1.183, <deffad5bb4f8b4f09e46252f24754ddc9960b244, <=6.18.*, ba92222ed63a12d09120df9b92f56cc990abac19, <19b783335d62e7a2367436a6e1f1b37da1878360, 4.1, <=*, <d99607c888f26e8a4e9fe9772860cef4aff86bb4, <=5.15.*, 7.1.8, <b6cb47e186abba85a3b08aa3023067ab82577286, 6.18.44, 6.6.151, 5.10.265, 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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