CVE-2026-89940 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506335
- published5 Oct 2026
- disclosed16 Sept 2026
Introduced: 16 Sep 2026
NewCVE-2026-89940 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
iio: buffer: Tie IIO dma fence lock lifetime to the fence
The iio_dma_fence implementation currently uses a lock embedded in the
iio_dmabuf_priv. But the iio_dma_fence can outlive the
iio_dmabuf_priv, which can cause a use-after-free.
Tie the lifetime of the lock to the lifetime of the fence by embedding them in the same struct.
We can't just hold a reference to the iio_dmabuf_priv from the
iio_dma_fence since iio_buffer_dmabuf_release() might sleep and the
fence release callback is not allowed to sleep.
Note that the dma_fence framework now has an internal lock that gets used
when the passing NULL for lock in dma_fence_init(), but in order to
allow this patch to be backportable use an external lock.
References
- https://security-tracker.debian.org/tracker/CVE-2026-89940
- https://git.kernel.org/stable/c/510497e31be4f241103507315a859e2085ccb081
- https://git.kernel.org/stable/c/6865d79fca17a80fbd60c12550ca9a5e0e20e0eb
- https://git.kernel.org/stable/c/8b3e221590181a8beb3735bbabf166df02c839b5
- https://git.kernel.org/stable/c/f25ec4627d935dedfb5fe83bd2c2678cdcc19611