{"id":"CVE-2026-98623","state":"PUBLISHED","title":"drm/nouveau/clk: fix list cursor use after loop in nvkm_clk_ustate_update","description":"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 '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]","publishedAt":"2026-10-18T15:19:44.744Z","updatedAt":"2026-10-19T09:22:51.359Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"db5dd9f47b4df1be322f498d846e9a82940a7390","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"9d550924961f61a491dd95359c63494fa8a23d9f","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"492e9cfa12f35f7946ea1b78a19f1f9337d62248","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"a867abcfa85ab487066c3d3008a1ba905da04113","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"5315c7bacfe274ddfe649d9556e9a341ffa812da","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"0d096a7f7d79207490858dde731b16da5337e90c","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"391517da7fd54ae40e4a7fe1cc696217343b0061","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"aff09d9e37e02dc60bde79035ac15b136d602259","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.13","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c"]}],"references":["https://git.kernel.org/stable/c/db5dd9f47b4df1be322f498d846e9a82940a7390","https://git.kernel.org/stable/c/9d550924961f61a491dd95359c63494fa8a23d9f","https://git.kernel.org/stable/c/492e9cfa12f35f7946ea1b78a19f1f9337d62248","https://git.kernel.org/stable/c/a867abcfa85ab487066c3d3008a1ba905da04113","https://git.kernel.org/stable/c/5315c7bacfe274ddfe649d9556e9a341ffa812da","https://git.kernel.org/stable/c/0d096a7f7d79207490858dde731b16da5337e90c","https://git.kernel.org/stable/c/391517da7fd54ae40e4a7fe1cc696217343b0061","https://git.kernel.org/stable/c/aff09d9e37e02dc60bde79035ac15b136d602259"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98623.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98623","state":"PUBLISHED","datePublished":"2026-10-18T15:19:44.744Z","dateUpdated":"2026-10-19T09:22:51.359Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.360Z"},"containers":{"cna":{"title":"drm/nouveau/clk: fix list cursor use after loop in nvkm_clk_ustate_update","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 '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]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"db5dd9f47b4df1be322f498d846e9a82940a7390","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"9d550924961f61a491dd95359c63494fa8a23d9f","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"492e9cfa12f35f7946ea1b78a19f1f9337d62248","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"a867abcfa85ab487066c3d3008a1ba905da04113","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"5315c7bacfe274ddfe649d9556e9a341ffa812da","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"0d096a7f7d79207490858dde731b16da5337e90c","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"391517da7fd54ae40e4a7fe1cc696217343b0061","versionType":"git"},{"version":"7c856522069755ab9d163a24ac332cd3cb35fe30","status":"affected","lessThan":"aff09d9e37e02dc60bde79035ac15b136d602259","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.13","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:22:51.359Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.18.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"7.2.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}