CVE-2026-89936
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.
Affected versions
Linux kernel versions
4.2
and later are affected. Fixed in
5.10.270,
5.15.221,
6.1.188,
6.6.157,
6.12.110,
6.18.51,
7.2.5,
7.3-rc1
and their respective stable series.
References
8 totalFrequently asked questions
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What is CVE-2026-89936?
CVE-2026-89936 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.2 onward and has been patched in 5.10.270, 5.15.221, 6.1.188 and others. CVE-2026-89936 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-89936?
Yes. CVE-2026-89936 has been patched. Fixed versions include 5.10.270, 5.15.221, 6.1.188 and others. If you are running Linux kernel 4.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-89936 actively exploited?
No. CVE-2026-89936 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.