CVE-2026-31740

Description

In the Linux kernel, the following vulnerability has been resolved: counter: rz-mtu3-cnt: do not use struct rz_mtu3_channel's dev member The counter driver can use HW channels 1 and 2, while the PWM driver can use HW channels 0, 1, 2, 3, 4, 6, 7. The dev member is assigned both by the counter driver and the PWM driver for channels 1 and 2, to their own struct device instance, overwriting the previous value. The sub-drivers race to assign their own struct device pointer to the same struct rz_mtu3_channel's dev member. The dev member of struct rz_mtu3_channel is used by the counter sub-driver for runtime PM. Depending on the probe order of the counter and PWM sub-drivers, the dev member may point to the wrong struct device instance, causing the counter sub-driver to do runtime PM actions on the wrong device. To fix this, use the parent pointer of the counter, which is assigned during probe to the correct struct device, not the struct device pointer inside the shared struct rz_mtu3_channel.

Gravité et risque d'exploitation

CVE-2026-31740 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 0.16 %, ce qui la place devant 5.0 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.12.*, <2932095c114b98cbb40ccf34fc00d613cb17cead, <6562290225c197e2e193a53de2a517815288dcd1, <63be324c795262f0e316c6fe9b329d83afa1ec93, 0, 6.6.134, 7.0, 6.4, <=6.6.*, <=6.19.*, <6.4, <=6.18.*, 6.12.81, <633dfbf0eb2766c597c1a59dd83035c82e14791d, <=*, 0be8907359df4c62319f5cb2c6981ff0d9ebf35a, <28a371be901ef44ee03726c2575d7d6795521fe0, 6.18.22, 6.19.12) 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/28a371be901ef44ee03726c2575d7d6795521fe0
• https://git.kernel.org/stable/c/633dfbf0eb2766c597c1a59dd83035c82e14791d
• https://git.kernel.org/stable/c/6562290225c197e2e193a53de2a517815288dcd1
• https://git.kernel.org/stable/c/63be324c795262f0e316c6fe9b329d83afa1ec93
• https://git.kernel.org/stable/c/2932095c114b98cbb40ccf34fc00d613cb17cead