drm/nouveau/clk: fix list cursor use after loop in nvkm_clk_ustate_update
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EPSS probability
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Risk score
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Published
23 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%63
Short explanation
A vulnerability exists in the Linux kernel drm/nouveau/clk subsystem within nvkm_clk_ustate_update due to list cursor use after loop, leading to an out-of-bounds read. This flaw is reachable from userspace via the pstate debugfs file.
The vulnerability allows an out-of-bounds read via a debugfs interface directly accessible from userspace, potentially compromising system stability and safety.
What should be done?
- Follow vendor advisories
- Apply relevant kernel updates
Chain of evidence and sources
nvkm_clk_ustate_update fonksiyonu pstate kimliğini pstate debugfs dosyasından alır.
Döngü kırılma yaşamadan bittiğinde pstate geçerli bir pstate işaretçisi değildir.
Show the technical text from the sources
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]
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
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Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98623 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98623 weaknesses.
Official Sources and Advisories
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