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

Type: advisorySource: Official CVE List1 source record

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]

Announced Source revision 1
Original source ↗

CVE-2026-98623

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98623

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "7c856522069755ab9d163a24ac332cd3cb35fe30",
        "lessThan": "db5dd9f47b4df1be322f498d846e9a82940a7390",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7c856522069755ab9d163a24ac332cd3cb35fe30",
        "lessThan": "9d550924961f61a491dd95359c63494fa8a23d9f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7c856522069755ab9d163a24ac332cd3cb35fe30",
        "lessThan": "492e9cfa12f35f7946ea1b78a19f1f9337d62248",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7c856522069755ab9d163a24ac332cd3cb35fe30",
        "lessThan": "a867abcfa85ab487066c3d3008a1ba905da04113",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7c856522069755ab9d163a24ac332cd3cb35fe30",
        "lessThan": "5315c7bacfe274ddfe649d9556e9a341ffa812da",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7c856522069755ab9d163a24ac332cd3cb35fe30",
        "lessThan": "0d096a7f7d79207490858dde731b16da5337e90c",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "391517da7fd54ae40e4a7fe1cc696217343b0061",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "aff09d9e37e02dc60bde79035ac15b136d602259",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98623

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38643 · Revision 1
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Publisher date
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