GHSA-5C9Q-M24X-7R34
Vulnerability from github – Published: 2026-10-18 18:31 – Updated: 2026-10-18 18:31In 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]
{
"affected": [],
"aliases": [
"CVE-2026-98623"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-18T16:17:15Z",
"severity": null
},
"details": "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]",
"id": "GHSA-5c9q-m24x-7r34",
"modified": "2026-10-18T18:31:57Z",
"published": "2026-10-18T18:31:56Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98623"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0d096a7f7d79207490858dde731b16da5337e90c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/391517da7fd54ae40e4a7fe1cc696217343b0061"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/492e9cfa12f35f7946ea1b78a19f1f9337d62248"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5315c7bacfe274ddfe649d9556e9a341ffa812da"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9d550924961f61a491dd95359c63494fa8a23d9f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a867abcfa85ab487066c3d3008a1ba905da04113"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aff09d9e37e02dc60bde79035ac15b136d602259"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/db5dd9f47b4df1be322f498d846e9a82940a7390"
}
],
"schema_version": "1.4.0",
"severity": []
}
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