What’s Vulnerable › Vulnerabilities

CVE-2026-89462: power: supply: max17040: propagate register read errors

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: power: supply: max17040: propagate register read errors max17040_get_vcell() and max17040_get_soc() ignore errors returned by regmap_read(). When an I2C transfer fails, the uninitialized register value is converted and reported to userspace as a valid voltage or state of charge. The polling worker can also replace the cached state of charge with the bogus value and emit a spurious change event. Propagate read errors through the power supply get_property callback and keep the last valid cached state of charge when polling fails.

Affected products

• Linux: 2.6.31 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/13fb0477da9b400071b9d518b24d6434c4965263
• https://git.kernel.org/stable/c/2943a0edd4865ed744702ada647921c3981207f6
• https://git.kernel.org/stable/c/659cc3d8d5ef246263873fce72c8cadeeed073cc
• https://git.kernel.org/stable/c/abf348c40cd409db72758377f1eb6ed400c981c6
• https://git.kernel.org/stable/c/bcdcbef9c5e69a1e79c6b9f6a3434da2f68724ed
• https://git.kernel.org/stable/c/c7aa4c3708cc0d8487336f8281665eaea87130f6

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