CVE-2026-98623
Received Received - Intake

Use-After-Free in Nouveau GPU Driver

Publication date: 2026-10-18

Last updated on: 2026-10-18

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/nouveau/clk: fix list cursor use after loop in nvkm_clk_ustate_update If list_for_each_entry() exits without hitting a break then "pstate" is not a valid pstate pointer. Introduce a "found" variable instead. The check is reachable from userspace: nvkm_clk_ustate_update() takes the pstate id straight from the 'pstate' debugfs file, so requesting an id that is not in clk->states - or any id at all when the perf tables are broken and the list is empty - makes the pstate->pstate != req test dereference the list head cast to a struct nvkm_pstate, which is an out-of-bounds read. [Francesco: rebased on drm-misc-next, expanded the commit message]

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Meta Information

Published
2026-10-18
Last Modified
2026-10-18
Generated
2026-10-18
AI Q&A
2026-10-18
EPSS Evaluated
N/A
NVD
CVE-2026-98623
EUVD
EUVD-2026-103668

Affected Vendors & Products

Showing 9 associated CPEs
Vendor Product Version / Range
Linux Linux 7c856522069755ab9d163a24ac332cd3cb35fe30
Linux Linux 7c856522069755ab9d163a24ac332cd3cb35fe30
Linux Linux 7c856522069755ab9d163a24ac332cd3cb35fe30
Linux Linux 7c856522069755ab9d163a24ac332cd3cb35fe30
Linux Linux 7c856522069755ab9d163a24ac332cd3cb35fe30
Linux Linux 7c856522069755ab9d163a24ac332cd3cb35fe30
Linux Linux 7c856522069755ab9d163a24ac332cd3cb35fe30
Linux Linux 7c856522069755ab9d163a24ac332cd3cb35fe30
Linux Linux 3.13

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves incorrect handling of a list cursor in the Nouveau graphics driver's clock management code. When a specific function processes a list of performance states, it fails to properly check if the state exists, leading to an out-of-bounds memory read if an invalid state is requested.

Impact Analysis

This flaw could allow a local attacker to read sensitive kernel memory or cause a system crash by triggering the out-of-bounds read through the Nouveau debugfs interface. It primarily affects systems using NVIDIA GPUs with Nouveau drivers.

Mitigation Strategies

Update your Linux kernel to the latest patched version to resolve the drm/nouveau/clk issue. Check your distribution's security advisories for kernel updates addressing CVE-2026-98623.

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