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CVE.org (no NVD analysis yet)· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 0d096a7f7d79207490858dde731b16da5337e90c, 391517da7fd54ae40e4a7fe1cc696217343b0061, 492e9cfa12f35f7946ea1b78a19f1f9337d62248; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0d096a7f7d79207490858dde731b16da5337e90c, 391517da7fd54ae40e4a7fe1cc696217343b0061, 492e9cfa12f35f7946ea1b78a19f1f9337d62248; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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]

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.13affected
    • 7c856522069755ab9d163a24ac332cd3cb35fe30 and later · before db5dd9f47b4df1be322f498d846e9a82940a7390affected · git
    • 7c856522069755ab9d163a24ac332cd3cb35fe30 and later · before 9d550924961f61a491dd95359c63494fa8a23d9faffected · git
    • 7c856522069755ab9d163a24ac332cd3cb35fe30 and later · before 492e9cfa12f35f7946ea1b78a19f1f9337d62248affected · git
    • 7c856522069755ab9d163a24ac332cd3cb35fe30 and later · before a867abcfa85ab487066c3d3008a1ba905da04113affected · git
    • 7c856522069755ab9d163a24ac332cd3cb35fe30 and later · before 5315c7bacfe274ddfe649d9556e9a341ffa812daaffected · git
    • 7c856522069755ab9d163a24ac332cd3cb35fe30 and later · before 0d096a7f7d79207490858dde731b16da5337e90caffected · git
    • 7c856522069755ab9d163a24ac332cd3cb35fe30 and later · before 391517da7fd54ae40e4a7fe1cc696217343b0061affected · git
    • 7c856522069755ab9d163a24ac332cd3cb35fe30 and later · before aff09d9e37e02dc60bde79035ac15b136d602259affected · git
    • before 3.13not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.9-17.2.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98621Oct 18, 2026 · net: gue: reject invalid REMCSUM offsets
    0Monitor
  • ← EarlierCVE-2026-98622Oct 18, 2026 · net/sched: act_ct: don't WARN on benign flow_offload_alloc() failure
    0Monitor
  • Later →CVE-2026-98624Oct 18, 2026 · netfilter: nfnetlink_queue: hold nfnl mutex in event notifier
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0d096a7f7d79207490858dde731b16da5337e90cVendor (CNA)
Linux Linux391517da7fd54ae40e4a7fe1cc696217343b0061Vendor (CNA)
Linux Linux492e9cfa12f35f7946ea1b78a19f1f9337d62248Vendor (CNA)
Linux Linux5315c7bacfe274ddfe649d9556e9a341ffa812daVendor (CNA)
Linux Linux9d550924961f61a491dd95359c63494fa8a23d9fVendor (CNA)
Linux Linuxa867abcfa85ab487066c3d3008a1ba905da04113Vendor (CNA)
Linux Linuxaff09d9e37e02dc60bde79035ac15b136d602259Vendor (CNA)
Linux Linuxdb5dd9f47b4df1be322f498d846e9a82940a7390Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 7, 2026+20 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records