Use-after-free in Linux kernel - CVE-2026-93042
Published: September 18, 2026
Vulnerability identifier: #VU150980
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-93042
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to trigger a use-after-free condition.
The vulnerability exists due to improper descriptor termination in the dw-edma DMA engine driver when terminating DMA transfers. A local user can invoke dmaengine_terminate_sync() during a deferred STOP, allowing a late callback to dereference freed client state to trigger a use-after-free condition.
A pending STOP may remain unresolved until the running transfer generates an interrupt.
Affected software
Linux kernel
How to mitigate CVE-2026-93042
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/4793f9099a1cadf4e37f3a03d524af6bce88a0ea
- https://git.kernel.org/stable/c/65e387b95d3855aa894ac729e1778e5bcb9083cb
- https://git.kernel.org/stable/c/99109a51efd28c9a661fbfb9469b023c517b31d1
- https://git.kernel.org/stable/c/be87d86537de7ea6fd025f41033d2faff880973f
- https://git.kernel.org/stable/c/f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7