CVE-2026-68403

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: initialize SDIO data work before cleanup brcmf_sdio_probe() stores the newly allocated bus in sdiodev->bus before allocating the ordered workqueue. If that allocation fails, the function jumps to fail and calls brcmf_sdio_remove(). brcmf_sdio_remove() unconditionally cancels bus->datawork. Initialize the work item before the first failure path that can reach brcmf_sdio_remove(), so the cleanup path always observes a valid work object. This issue was found by our static analysis tool and then confirmed by manual review of the probe error path and the remove-time work drain. The problem pattern is an early setup failure that reaches a cleanup helper which cancels an embedded work item before its initializer has run. A QEMU PoC forced alloc_ordered_workqueue() to fail at the same point in brcmf_sdio_probe(), before INIT_WORK(&bus->datawork) is reached. The resulting fail path calls brcmf_sdio_remove(), and DEBUG_OBJECTS reports the invalid work drain with brcmf_sdio_probe() and brcmf_sdio_remove() in the stack.

Gravité et risque d'exploitation

CVE-2026-68403 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 0.18 %, ce qui la place devant 6.8 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 9982464379e81ece51ced03ebecbbcd34ea367a6, <f50a2b9e57a751e70ae9a272875d80d39eaccd6a, 6.12.101, 0, <4.1, <=7.1.*, 5.15.216, <fb12c87ae855346321af72e57a93c146205f1090, <9a4be91e5bb032b34cb3c962f6d4f82e7ef09364, <=5.10.*, <=6.6.*, <5c342437ea44bb829680ca9e4f683dd5b325b219, 6.18.42, 7.1.6, 6.1.183, <=6.18.*, <860887d22890417d43ef8298f0cc4865e29b54de, 4.1, <2a665946e0407a05a3f81bd56a08553c446498e0, <=*, <=5.15.*, <6bd21ec8549a5854dd64204a66289952917a924c, <c73c3fc1c7ca5a927639f0884624cb244ba791e4, 5.10.265, 6.6.148, 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

• https://git.kernel.org/stable/c/860887d22890417d43ef8298f0cc4865e29b54de
• https://git.kernel.org/stable/c/9a4be91e5bb032b34cb3c962f6d4f82e7ef09364
• https://git.kernel.org/stable/c/fb12c87ae855346321af72e57a93c146205f1090
• https://git.kernel.org/stable/c/f50a2b9e57a751e70ae9a272875d80d39eaccd6a
• https://git.kernel.org/stable/c/6bd21ec8549a5854dd64204a66289952917a924c
• https://git.kernel.org/stable/c/5c342437ea44bb829680ca9e4f683dd5b325b219
• https://git.kernel.org/stable/c/c73c3fc1c7ca5a927639f0884624cb244ba791e4
• https://git.kernel.org/stable/c/2a665946e0407a05a3f81bd56a08553c446498e0