CVE-2026-98623 (GCVE-0-2026-98623)
Vulnerability from cvelistv5
Published
2026-10-18 15:19
Modified
2026-10-19 09:22
Severity ?
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]
References
Impacted products
Vendor Product Version
Linux Linux Version: 7c856522069755ab9d163a24ac332cd3cb35fe30
Version: 7c856522069755ab9d163a24ac332cd3cb35fe30
Version: 7c856522069755ab9d163a24ac332cd3cb35fe30
Version: 7c856522069755ab9d163a24ac332cd3cb35fe30
Version: 7c856522069755ab9d163a24ac332cd3cb35fe30
Version: 7c856522069755ab9d163a24ac332cd3cb35fe30
Version: 7c856522069755ab9d163a24ac332cd3cb35fe30
Version: 7c856522069755ab9d163a24ac332cd3cb35fe30
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c"
          ],
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              "version": "0",
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:22:51.359Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/db5dd9f47b4df1be322f498d846e9a82940a7390"
        },
        {
          "url": "https://git.kernel.org/stable/c/9d550924961f61a491dd95359c63494fa8a23d9f"
        },
        {
          "url": "https://git.kernel.org/stable/c/492e9cfa12f35f7946ea1b78a19f1f9337d62248"
        },
        {
          "url": "https://git.kernel.org/stable/c/a867abcfa85ab487066c3d3008a1ba905da04113"
        },
        {
          "url": "https://git.kernel.org/stable/c/5315c7bacfe274ddfe649d9556e9a341ffa812da"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d096a7f7d79207490858dde731b16da5337e90c"
        },
        {
          "url": "https://git.kernel.org/stable/c/391517da7fd54ae40e4a7fe1cc696217343b0061"
        },
        {
          "url": "https://git.kernel.org/stable/c/aff09d9e37e02dc60bde79035ac15b136d602259"
        }
      ],
      "title": "drm/nouveau/clk: fix list cursor use after loop in nvkm_clk_ustate_update",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98623",
    "datePublished": "2026-10-18T15:19:44.744Z",
    "dateReserved": "2026-09-25T10:25:14.360Z",
    "dateUpdated": "2026-10-19T09:22:51.359Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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