Linux Kernel up to 7.2.12 PMC driver tegra_pmc_enter_suspend_mode rate uninitialized variable

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.12 and classified as critical. The affected element is the function tegra_pmc_enter_suspend_mode of the component PMC driver. Such manipulation of the argument rate leads to uninitialized variable. This vulnerability is listed as CVE-2026-99259. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 7.2.12. Affected by this issue is the function tegra_pmc_enter_suspend_mode of the component PMC driver. The manipulation of the argument rate with an unknown input leads to a uninitialized variable vulnerability. Using CWE to declare the problem leads to CWE-457. The code uses a variable that has not been initialized, leading to unpredictable or unintended results. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: soc/tegra: pmc: Fix uninitialised clock rate For legacy 32-bit Tegra devices, the warning in the tegra_pmc_enter_suspend_mode() function is being triggered because the early_pmc->rate variable is never configured and hence, always 0. This issue started occurring after updating the PMC driver to create the PMC context dynamically which causes the 'rate' to be set in the new dynamic context, but missed updating the rate in the early PMC context. Fix this by initialising the early_pmc->rate variable for 32-bit Tegra devices when the rate for the PMC context is initialised. [[email protected]: move assignment to existing #ifdef block]

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-99259 since 09/25/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/03/2026).

Upgrading to version 7.2.13 eliminates this vulnerability. Applying the patch 43bc7d5707bbbf75e56db849b987193d6e866ec6 is able to eliminate this problem. 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

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5
• 7.2.6
• 7.2.7
• 7.2.8
• 7.2.9
• 7.2.10
• 7.2.11
• 7.2.12

License

• open-source

Website

• Vendor: https://www.kernel.org/

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