{"id":"CVE-2026-98623","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:\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 po…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < db5dd9f47b4df1be322f498d846e9a82940a7390","Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < 9d550924961f61a491dd95359c63494fa8a23d9f","Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < 492e9cfa12f35f7946ea1b78a19f1f9337d62248","Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < a867abcfa85ab487066c3d3008a1ba905da04113","Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < 5315c7bacfe274ddfe649d9556e9a341ffa812da","Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < 0d096a7f7d79207490858dde731b16da5337e90c","Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < 391517da7fd54ae40e4a7fe1cc696217343b0061","Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < aff09d9e37e02dc60bde79035ac15b136d602259","Linux 3.13"],"published":"2026-10-18","updated":"2026-10-19","sourceUpdated":"2026-10-19T09:22:51.359Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98623","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"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T15:45:12.236Z","slug":"CVE-2026-98623","body":"## Overview\n\nIn 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 'pstate' debugfs file, so requesting an id\nthat is not in clk->states - or any id at all when the perf tables are\nbroken and the list is empty - makes the pstate->pstate != 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]\n\n## Affected\n\n- `Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < db5dd9f47b4df1be322f498d846e9a82940a7390`\n- `Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < 9d550924961f61a491dd95359c63494fa8a23d9f`\n- `Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < 492e9cfa12f35f7946ea1b78a19f1f9337d62248`\n- `Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < a867abcfa85ab487066c3d3008a1ba905da04113`\n- `Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < 5315c7bacfe274ddfe649d9556e9a341ffa812da`\n- `Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < 0d096a7f7d79207490858dde731b16da5337e90c`\n- `Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < 391517da7fd54ae40e4a7fe1cc696217343b0061`\n- `Linux >= 7c856522069755ab9d163a24ac332cd3cb35fe30 < aff09d9e37e02dc60bde79035ac15b136d602259`\n- `Linux 3.13`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}