All vulnerabilities
CVE-2026-98623

Linux: drm/nouveau/clk: fix list cursor use after loop in nvkm_clk_ustate_update

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in9d550924961f61a491dd95359c63494fa8a23d9fAlso 492e9cfa12f35f7946ea1b78a19f1f9337d62248, 5315c7bacfe274ddfe649d9556e9a341ffa812da and 2 moreCVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 9d550924961f61a491dd95359c63494fa8a23d9fLinuxCVE List
  • 492e9cfa12f35f7946ea1b78a19f1f9337d62248LinuxCVE List
  • 5315c7bacfe274ddfe649d9556e9a341ffa812daLinuxCVE List
  • 0d096a7f7d79207490858dde731b16da5337e90cLinuxCVE List
  • 391517da7fd54ae40e4a7fe1cc696217343b0061LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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]

Text from CVE List

Affected versions 18

  • Linuxaffected: 7c856522069755ab9d163a24ac332cd3cb35fe30 before db5dd9f47b4df1be322f498d846e9a82940a7390CVE List
  • Linuxaffected: 7c856522069755ab9d163a24ac332cd3cb35fe30 before 9d550924961f61a491dd95359c63494fa8a23d9fCVE List
  • Linuxaffected: 7c856522069755ab9d163a24ac332cd3cb35fe30 before 492e9cfa12f35f7946ea1b78a19f1f9337d62248CVE List
  • Linuxaffected: 7c856522069755ab9d163a24ac332cd3cb35fe30 before a867abcfa85ab487066c3d3008a1ba905da04113CVE List
  • Linuxaffected: 7c856522069755ab9d163a24ac332cd3cb35fe30 before 5315c7bacfe274ddfe649d9556e9a341ffa812daCVE List
  • Linuxaffected: 7c856522069755ab9d163a24ac332cd3cb35fe30 before 0d096a7f7d79207490858dde731b16da5337e90cCVE List
  • Linuxaffected: 7c856522069755ab9d163a24ac332cd3cb35fe30 before 391517da7fd54ae40e4a7fe1cc696217343b0061CVE List
  • Linuxaffected: 7c856522069755ab9d163a24ac332cd3cb35fe30 before aff09d9e37e02dc60bde79035ac15b136d602259CVE List
  • Linuxaffected: 3.13CVE List
  • Linuxunaffected: all versions before 3.13CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.55 through 6.18.*CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8