CVE-2026-72142
Vulnérabilité non évaluée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: i2c: imx: fix locked bus on SMBus block-read of 0 (atomic) SMBus 3.1 6.5.7 allows a Block Read byte count of 0, but the atomic (polling) path rejects it as -EPROTO. Worse, it returns without a NACK+STOP: the next receive cycle has already started, so the target keeps holding SDA and the bus stays stuck until a power cycle for this i2c controller. Reading I2DR to obtain the count likewise arms the next byte on the count > I2C_SMBUS_BLOCK_MAX path, which also returned -EPROTO directly and left the bus held. Handle both: NACK the in-flight dummy byte (TXAK) and extend msgs->len so the existing last-byte handling emits STOP; the dummy byte is discarded. A count of 0 is a valid empty block read; a count above I2C_SMBUS_BLOCK_MAX is still reported as -EPROTO, but only after the bus has been released. The interrupt-driven path has the same flaw from a later commit and is fixed separately, as it carries a different Fixes: tag and stable range.
Gravité et risque d'exploitation
CVE-2026-72142 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 11.3 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions <cb2fc37857693b55909fb77dc2c87cfbc1cdc476, <=6.1.*, 6.18.40, <=6.12.*, 7.1.5, <60ed00d46616a9232e42ea7a3e3c0273d7cf7543, 6.12.101, 5.15.217, <6d2c973926d0612360693bc559be2ffde836151b, <c882e8cc68fb993700dc21fd6e754001e6297934, 0, <=7.1.*, <016ef0f6ca4bc9bf0330ac41bd2ea349759643e3, <=5.10.*, <=6.6.*, 5.10.266, <=6.18.*, 6.1.184, 8e8782c71595a5ad29e234ce6b3d2fce787fb07a, <38d4947431b2410850409fda016b2ac9f640a4dd, <=*, <=5.15.*, 3.16, <3.16, 6.6.148, 7.2, <0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec, <e3e8b02d4773cfc5ad561d2e5505efde36c6927a) 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
- https://git.kernel.org/stable/c/0f29df3c3d607a9dbc14aed0e45504ced4d2e7ec
- https://git.kernel.org/stable/c/38d4947431b2410850409fda016b2ac9f640a4dd
- https://git.kernel.org/stable/c/e3e8b02d4773cfc5ad561d2e5505efde36c6927a
- https://git.kernel.org/stable/c/016ef0f6ca4bc9bf0330ac41bd2ea349759643e3
- https://git.kernel.org/stable/c/c882e8cc68fb993700dc21fd6e754001e6297934
- https://git.kernel.org/stable/c/6d2c973926d0612360693bc559be2ffde836151b
- https://git.kernel.org/stable/c/60ed00d46616a9232e42ea7a3e3c0273d7cf7543
- https://git.kernel.org/stable/c/cb2fc37857693b55909fb77dc2c87cfbc1cdc476