CVE-2026-93042

Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: dw-edma: Terminate all descriptors without callbacks The DMA Engine client documentation says in the "Terminate APIs" section of Documentation/driver-api/dmaengine/client.rst: "No callback functions will be called for any incomplete transfers." dw-edma instead calls vchan_cookie_complete() when a deferred STOP reaches the interrupt handler. This schedules a callback for the active descriptor and leaves other issued or submitted descriptors queued. A late callback after dmaengine_terminate_sync() can dereference client state that has already been freed, while leftover descriptors may later restart into reused buffers or leak. Move all issued and submitted descriptors to the terminated list whenever termination completes. For a pending STOP, do this from both the DONE and ABORT paths. Complete their cookies in order without scheduling callbacks. A STOP can remain pending until the running transfer raises an interrupt. Make device_synchronize() wait for such a pending STOP to complete before releasing terminated descriptors. Reuse it from free_chan_resources(), then release the remaining virt-dma resources. Sleep instead of busy-polling while waiting, and warn if the existing timeout expires.

Gravité et risque d'exploitation

CVE-2026-93042 obtient un score CVSS de 8.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.40 %, ce qui la place devant 32.5 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.12.*, e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf, <99109a51efd28c9a661fbfb9469b023c517b31d1, <65e387b95d3855aa894ac729e1778e5bcb9083cb, 0, 6.18.52, <f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7, <be87d86537de7ea6fd025f41033d2faff880973f, <=6.6.*, 6.6.157, 7.2.6, 5.3, <=6.18.*, <5.3, <=7.2.*, 6.12.110, <=*, <4793f9099a1cadf4e37f3a03d524af6bce88a0ea, 7.3) 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/65e387b95d3855aa894ac729e1778e5bcb9083cb
• https://git.kernel.org/stable/c/4793f9099a1cadf4e37f3a03d524af6bce88a0ea
• https://git.kernel.org/stable/c/be87d86537de7ea6fd025f41033d2faff880973f
• https://git.kernel.org/stable/c/f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7
• https://git.kernel.org/stable/c/99109a51efd28c9a661fbfb9469b023c517b31d1