CVE-2026-45902

Description

In the Linux kernel, the following vulnerability has been resolved: power: supply: bq256xx: Fix use-after-free in power_supply_changed() Using the `devm_` variant for requesting IRQ _before_ the `devm_` variant for allocating/registering the `power_supply` handle, means that the `power_supply` handle will be deallocated/unregistered _before_ the interrupt handler (since `devm_` naturally deallocates in reverse allocation order). This means that during removal, there is a race condition where an interrupt can fire just _after_ the `power_supply` handle has been freed, *but* just _before_ the corresponding unregistration of the IRQ handler has run. This will lead to the IRQ handler calling `power_supply_changed()` with a freed `power_supply` handle. Which usually crashes the system or otherwise silently corrupts the memory... Note that there is a similar situation which can also happen during `probe()`; the possibility of an interrupt firing _before_ registering the `power_supply` handle. This would then lead to the nasty situation of using the `power_supply` handle *uninitialized* in `power_supply_changed()`. Fix this racy use-after-free by making sure the IRQ is requested _after_ the registration of the `power_supply` handle.

Gravité et risque d'exploitation

CVE-2026-45902 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 0.17 %, ce qui la place devant 6.1 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 32e4978bb920d047fe5de3ea42d176f267c01f63, <83c27fdd696ac13d023ef7a0345301be93209c53, 0, 7.0, 6.1.165, 6.12.75, <74b5a88318db97d51bb40f774736553c2acd1514, <4b6fb0b6124f558131e502e3ffd03e6583b3ace6, <81d3688c9a2158329391e08f2d0b8ba204216044, 5.12, <=6.6.*, <=6.19.*, <cb5c743936edcebc51880eeb6bf04979b5c9438b, <8796910131a32ff29275052df768ef022929a394, <=6.18.*, <8005843369723d9c8975b7c4202d1b85d6125302, <5.12, 6.6.128, 6.19.4, <=*, <=5.15.*, 5.15.202, 6.18.14) 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/81d3688c9a2158329391e08f2d0b8ba204216044
• https://git.kernel.org/stable/c/74b5a88318db97d51bb40f774736553c2acd1514
• https://git.kernel.org/stable/c/cb5c743936edcebc51880eeb6bf04979b5c9438b
• https://git.kernel.org/stable/c/83c27fdd696ac13d023ef7a0345301be93209c53
• https://git.kernel.org/stable/c/4b6fb0b6124f558131e502e3ffd03e6583b3ace6
• https://git.kernel.org/stable/c/8796910131a32ff29275052df768ef022929a394
• https://git.kernel.org/stable/c/8005843369723d9c8975b7c4202d1b85d6125302