Linux Kernel up to 7.1.9 pmdomain mtk_mfg_attach_dev uninitialized variable

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 7.1.9. Affected is the function mtk_mfg_attach_dev of the component pmdomain. This manipulation causes uninitialized variable. This vulnerability appears as CVE-2026-80751. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 7.1.9 and classified as very critical. Affected by this vulnerability is the function mtk_mfg_attach_dev of the component pmdomain. The manipulation with an unknown input leads to a uninitialized variable vulnerability. The CWE definition for the vulnerability is CWE-457. The code uses a variable that has not been initialized, leading to unpredictable or unintended results. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: pmdomain: mediatek: mfg: initialize prev_o in mtk_mfg_attach_dev() mtk_mfg_attach_dev() reads prev_o on the first iteration of its loop, in "if (prev_o && prev_o->freq == o->freq)", before prev_o is assigned at the end of the loop body. On that first iteration, evaluating prev_o reads an indeterminate value. If it is non-NULL, the condition dereferences a stale or invalid pointer, potentially faulting or incorrectly skipping the first OPP. Initialize prev_o to NULL. This matches the intent as well: there is no previous OPP to compare against on the first iteration. Found with Clang's -Wconditional-uninitialized.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-80751 since 08/26/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/03/2026).

Upgrading to version 7.1.10 eliminates this vulnerability. Applying the patch de4eec0dfde8c0e27f8915bbb244d17ff68f2fb4/090a95dbe13df9965279b588d97eda134831769c is able to eliminate this problem.

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

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5
• 7.1.6
• 7.1.7
• 7.1.8
• 7.1.9

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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