VulnerabilityPublished 18 Oct 2026

CVE-2026-98623: Linux kernel · drm/nouveau/clk: fix list cursor use after loop in nvkm_clk_ustate_update

Source GCVE Database

Authoritative record:CVE-2026-98623· Medium

Not known to be exploited · fixed in db5dd9f47b4df1be322f498d846e9a82940a7390 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in db5dd9f47b4df1be322f498d846e9a82940a7390, aff09d9e37e02dc60bde79035ac15b136d602259, a867abcfa85ab487066c3d3008a1ba905da04113 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-5c9q-m24x-7r34

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 7c856522069755ab9d163a24ac332cd3cb35fe30, < db5dd9f47b4df1be322f498d846e9a82940a7390	Fixed in db5dd9f47b4df1be322f498d846e9a82940a7390
LinuxLinux	Affected ≥ 7c856522069755ab9d163a24ac332cd3cb35fe30, < aff09d9e37e02dc60bde79035ac15b136d602259	Fixed in aff09d9e37e02dc60bde79035ac15b136d602259
LinuxLinux	Affected ≥ 7c856522069755ab9d163a24ac332cd3cb35fe30, < a867abcfa85ab487066c3d3008a1ba905da04113	Fixed in a867abcfa85ab487066c3d3008a1ba905da04113
LinuxLinux	Affected ≥ 7c856522069755ab9d163a24ac332cd3cb35fe30, < 391517da7fd54ae40e4a7fe1cc696217343b0061	Fixed in 391517da7fd54ae40e4a7fe1cc696217343b0061
LinuxLinux	Affected ≥ 7c856522069755ab9d163a24ac332cd3cb35fe30, < 5315c7bacfe274ddfe649d9556e9a341ffa812da	Fixed in 5315c7bacfe274ddfe649d9556e9a341ffa812da
LinuxLinux	Affected ≥ 7c856522069755ab9d163a24ac332cd3cb35fe30, < 492e9cfa12f35f7946ea1b78a19f1f9337d62248	Fixed in 492e9cfa12f35f7946ea1b78a19f1f9337d62248

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix has been implemented in the Linux kernel to address this vulnerability by adding a 'found' variable to ensure pointer validity after list traversal. Users should update their Linux kernel to a version that includes this fix. No additional mitigation steps are indicated by the vendor advisory.

Description

A use-after-loop vulnerability in the Linux kernel's drm/nouveau/clk component was resolved. The issue occurs in the nvkm_clk_ustate_update function when a list traversal exits without a break, causing an invalid pointer dereference. This can lead to an out-of-bounds read when userspace requests an invalid pstate id via debugfs. The flaw was fixed by introducing a 'found' variable to ensure pointer validity.

References

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