Linux Kernel up to 5.18.12 power_supply_temp2resist_simple table[] out-of-bounds

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 5.18.12. The impacted element is the function power_supply_temp2resist_simple. Performing a manipulation of the argument table[] results in out-of-bounds. This vulnerability is cataloged as CVE-2022-49612. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.18.12. It has been classified as problematic. This affects the function power_supply_temp2resist_simple. The manipulation of the argument table[] with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: power: supply: core: Fix boundary conditions in interpolation The functions power_supply_temp2resist_simple and power_supply_ocv2cap_simple handle boundary conditions incorrectly. The change was introduced in a4585ba2050f460f749bbaf2b67bd56c41e30283 ("power: supply: core: Use library interpolation"). There are two issues: First, the lines "high = i - 1" and "high = i" in ocv2cap have the wrong order compared to temp2resist. As a consequence, ocv2cap sets high=-1 if ocv>table[0].ocv, which causes an out-of-bounds read. Second, the logic of temp2resist is also not correct. Consider the case table[] = {{20, 100}, {10, 80}, {0, 60}}. For temp=5, we expect a resistance of 70% by interpolation. However, temp2resist sets high=low=2 and returns 60.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2022-49612 since 02/26/2025. Technical details are known, but no exploit is available.

Upgrading to version 5.18.13 eliminates this vulnerability. Applying the patch a762cee5d933fe4e2e1b773d60fc74fb8248d8c4/093d27bb6f2d1963f927ef59c9a2d37059175426 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.18.0
• 5.18.1
• 5.18.2
• 5.18.3
• 5.18.4
• 5.18.5
• 5.18.6
• 5.18.7
• 5.18.8
• 5.18.9
• 5.18.10
• 5.18.11
• 5.18.12

License

• open-source

Website

• Vendor: https://www.kernel.org/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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