CVE-2026-99259
Received Received - Intake

Tegra PMC Clock Rate Initialization Flaw in Linux Kernel

Publication date: 2026-11-03

Last updated on: 2026-11-03

Assigner: kernel.org

Description
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. [treding@nvidia.com: move assignment to existing #ifdef block]

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Meta Information

Published
2026-11-03
Last Modified
2026-11-03
Generated
2026-11-03
AI Q&A
2026-11-03
EPSS Evaluated
N/A
NVD
CVE-2026-99259
EUVD
EUVD-2026-115770

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
Linux Linux 4d61f03426892b14d498e160be245edcb9dd8359
Linux Linux 4d61f03426892b14d498e160be245edcb9dd8359
Linux Linux 7.2

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability affects the Linux kernel on legacy 32-bit Tegra devices. It involves an uninitialized clock rate in the PMC (Power Management Controller) driver. The early_pmc->rate variable is not set, causing it to default to 0, which triggers a warning in the suspend mode function.

Detection Guidance

This vulnerability is specific to the Linux kernel's Tegra PMC driver on 32-bit legacy devices. Detection requires checking kernel logs for warnings related to uninitialised clock rate in the tegra_pmc_enter_suspend_mode() function. Monitor dmesg or journalctl for PMC-related errors.

Impact Analysis

This vulnerability may cause system instability or unexpected behavior during suspend/resume cycles on affected 32-bit Tegra devices. It could lead to warnings or errors in the kernel log, but does not directly expose security risks.

Mitigation Strategies

Apply the kernel patch that initialises the early_pmc->rate variable for 32-bit Tegra devices. Update to a Linux kernel version containing the fix. Reboot the system after applying the patch to ensure changes take effect.

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