{"id":"CVE-2026-68206","title":"media: v4l2-ctrls: validate HEVC active reference counts","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: v4l2-ctrls: validate HEVC active reference counts\n\nHEVC slice parameters are shared stateless V4L2 controls, but the common\nvalidation path does not verify the a…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < 3299c3905f3fb439ebd892658b87bc76c93ae116","Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < 9a998cc1c348769262d433acb7d238c5fac4b2e0","Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < dbaf0e0023e2f9332c5164822def7f80b7d2c5ef","Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < 3068ab802fc98b121dcb451e1f7f4d338ffc7a19","Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < b01df98a6669d2b67d8aed816021b327fd905998","Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < afbe4bc252d90a6f8fad869b06d5430f615f22f9","Linux 5.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:45:53.723010Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:03.752Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68206","references":[{"url":"https://git.kernel.org/stable/c/3299c3905f3fb439ebd892658b87bc76c93ae116"},{"url":"https://git.kernel.org/stable/c/9a998cc1c348769262d433acb7d238c5fac4b2e0"},{"url":"https://git.kernel.org/stable/c/dbaf0e0023e2f9332c5164822def7f80b7d2c5ef"},{"url":"https://git.kernel.org/stable/c/3068ab802fc98b121dcb451e1f7f4d338ffc7a19"},{"url":"https://git.kernel.org/stable/c/b01df98a6669d2b67d8aed816021b327fd905998"},{"url":"https://git.kernel.org/stable/c/afbe4bc252d90a6f8fad869b06d5430f615f22f9"}],"tags":["cve.org"],"epss":0.00176,"epssPercentile":0.06681,"ingestedAt":"2026-10-16T17:24:46.852Z","slug":"CVE-2026-68206","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nmedia: v4l2-ctrls: validate HEVC active reference counts\n\nHEVC slice parameters are shared stateless V4L2 controls, but the common\nvalidation path does not verify the active L0/L1 reference counts before\ndriver-specific code consumes them.\n\nThe original report came from Cedrus, but the active count bounds are\nnot Cedrus-specific. Validate them in the common HEVC slice control path\nso stateless HEVC drivers get the same basic guarantees as soon as the\ncontrol is queued.\n\nDo not reject ref_idx_l0/ref_idx_l1 entries here. Existing userspace may\nuse out-of-range sentinel values such as 0xff for missing references, and\nsome hardware can use that information for concealment. Keep this common\ncheck limited to the active reference counts.\n\n## Affected\n\n- `Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < 3299c3905f3fb439ebd892658b87bc76c93ae116`\n- `Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < 9a998cc1c348769262d433acb7d238c5fac4b2e0`\n- `Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < dbaf0e0023e2f9332c5164822def7f80b7d2c5ef`\n- `Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < 3068ab802fc98b121dcb451e1f7f4d338ffc7a19`\n- `Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < b01df98a6669d2b67d8aed816021b327fd905998`\n- `Linux >= d395a78db9eabd12633b39e05c80e803543b6590 < afbe4bc252d90a6f8fad869b06d5430f615f22f9`\n- `Linux 5.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}