CVE-2026-89936 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20506616
- published5 Oct 2026
- disclosed16 Sept 2026
Introduced: 16 Sep 2026
NewCVE-2026-89936 (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: dac: m62332: Fix regulator reference count imbalance
m62332_set_value() enables the Vcc regulator on every write of a non-zero value and disables it on every write of zero, without tracking the channel's current state. Because the regulator is reference counted, changing a channel directly from one non-zero value to another enables it more than once, while a later write of zero disables it only once. The reference count never returns to zero and the regulator is left enabled indefinitely.
Only enable the regulator on the transition from zero to non-zero, and only disable it on the transition from non-zero to zero, using the previously stored channel value to detect the edge. Balance the regulator on the I2C error path so the reference count stays consistent if the write fails.
References
- https://security-tracker.debian.org/tracker/CVE-2026-89936
- https://git.kernel.org/stable/c/08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9
- https://git.kernel.org/stable/c/1d3a7d7dd3adee19e00be2b2237140f0fe169484
- https://git.kernel.org/stable/c/9263b9ad968a563337a60e0eb66e35186e1faf9a
- https://git.kernel.org/stable/c/9fe22f563b2a0fdb11fd3711a8c39c023629c08a
- https://git.kernel.org/stable/c/a130404ce0b69ca1438126bd81c1985d3b4d2e6f
- https://git.kernel.org/stable/c/ae18d2d2ef27a4d04fda6e30c23774513dc9be1e
- https://git.kernel.org/stable/c/bac0ed8bee651aa841375edf72c6ab1d10ac80c6
- https://git.kernel.org/stable/c/f5acb824277a97a5210c454872202bf7f08c75d4