CVE-2026-98623 (GCVE-0-2026-98623)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:19 – Updated: 2026-10-19 09:22
VLAI
Title
drm/nouveau/clk: fix list cursor use after loop in nvkm_clk_ustate_update
Summary
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]
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7c856522069755ab9d163a24ac332cd3cb35fe30 , < db5dd9f47b4df1be322f498d846e9a82940a7390 (git)
Affected: 7c856522069755ab9d163a24ac332cd3cb35fe30 , < 9d550924961f61a491dd95359c63494fa8a23d9f (git)
Affected: 7c856522069755ab9d163a24ac332cd3cb35fe30 , < 492e9cfa12f35f7946ea1b78a19f1f9337d62248 (git)
Affected: 7c856522069755ab9d163a24ac332cd3cb35fe30 , < a867abcfa85ab487066c3d3008a1ba905da04113 (git)
Affected: 7c856522069755ab9d163a24ac332cd3cb35fe30 , < 5315c7bacfe274ddfe649d9556e9a341ffa812da (git)
Affected: 7c856522069755ab9d163a24ac332cd3cb35fe30 , < 0d096a7f7d79207490858dde731b16da5337e90c (git)
Affected: 7c856522069755ab9d163a24ac332cd3cb35fe30 , < 391517da7fd54ae40e4a7fe1cc696217343b0061 (git)
Affected: 7c856522069755ab9d163a24ac332cd3cb35fe30 , < aff09d9e37e02dc60bde79035ac15b136d602259 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau/clk: fix list cursor use after loop in nvkm_clk_ustate_update\n\nIf list_for_each_entry() exits without hitting a break then \"pstate\" is\nnot a valid pstate pointer.  Introduce a \"found\" variable instead.\n\nThe check is reachable from userspace: nvkm_clk_ustate_update() takes the\npstate id straight from the \u0027pstate\u0027 debugfs file, so requesting an id\nthat is not in clk-\u003estates - or any id at all when the perf tables are\nbroken and the list is empty - makes the pstate-\u003epstate != req test\ndereference the list head cast to a struct nvkm_pstate, which is an\nout-of-bounds read.\n\n[Francesco: rebased on drm-misc-next, expanded the commit message]"
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: drm/nouveau/clk: fix list cursor use after loop in nvkm_clk_ustate_update",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98623.json",
      "version": "3"
    }
  }
}



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