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CVE-2026-89936

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Last modified

CVE-2026-89936 is a vulnerability of currently unknown severity. 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.

Description

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 Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= b87b0c0f81e8d11c881b726b886b7502ab67d884, < bac0ed8bee651aa841375edf72c6ab1d10ac80c6; >= b87b0c0f81e8d11c881b726b886b7502ab67d884, < 9263b9ad968a563337a60e0eb66e35186e1faf9a; >= b87b0c0f81e8d11c881b726b886b7502ab67d884, < 1d3a7d7dd3adee19e00be2b2237140f0fe169484; >= b87b0c0f81e8d11c881b726b886b7502ab67d884, < f5acb824277a97a5210c454872202bf7f08c75d4; >= b87b0c0f81e8d11c881b726b886b7502ab67d884, < ae18d2d2ef27a4d04fda6e30c23774513dc9be1e; >= b87b0c0f81e8d11c881b726b886b7502ab67d884, < 08ac8d2976d57aa943d64e351c4d0bd8bb0c6de9; >= b87b0c0f81e8d11c881b726b886b7502ab67d884, < 9fe22f563b2a0fdb11fd3711a8c39c023629c08a; >= b87b0c0f81e8d11c881b726b886b7502ab67d884, < a130404ce0b69ca1438126bd81c1985d3b4d2e6f
LinuxLinux4.2

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-89936?
Severity scoring for CVE-2026-89936 is pending analysis.
How do I fix CVE-2026-89936?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST