{"id":"CVE-2026-43220","title":"iommu/amd: serialize sequence allocation under concurrent TLB invalidations","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: serialize sequence allocation under concurrent TLB invalidations\n\nWith concurrent TLB invalidations, completion wait randomly gets timed out\nbecause cmd_sem_…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= f2f65b28d802a667119147444ec2ae33eebf9a58 < d51bf43193b1e95dc4e34e540dc76e19def2ae5a","Linux >= 715c263119fd1b918a9fcbd8a36ea5b604a46324 < fca7aa0264ae99e5ff287d0ced5af0b82b121c4f","Linux >= e15768e68820142077bbca402d8e902f64ade1b0 < 5000ce7fcb31067566a1a1a2e5b5bbff93625242","Linux >= 496269d12072ecb219826485bdbec70c92a8eef5 < 48caa7542a795c9679ec1bd1bc2592e05a7369a4","Linux >= d2a0cac10597068567d336e85fa3cbdbe8ca62bf < 9e249c48412828e807afddc21527eb734dc9bd3d","Linux 69d9339c02eddfc2a345be7220651068a3684383","Linux >= 6.1.191 < 6.2","Linux >= 6.6.128 < 6.6.140","Linux >= 6.12.75 < 6.12.88"],"published":"2026-05-06","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:25:12.344Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43220","references":[{"url":"https://git.kernel.org/stable/c/d51bf43193b1e95dc4e34e540dc76e19def2ae5a"},{"url":"https://git.kernel.org/stable/c/fca7aa0264ae99e5ff287d0ced5af0b82b121c4f"},{"url":"https://git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242"},{"url":"https://git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4"},{"url":"https://git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3d"}],"tags":["cve.org"],"epss":0.00127,"epssPercentile":0.0243,"ingestedAt":"2026-11-05T15:02:32.277Z","slug":"CVE-2026-43220","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: serialize sequence allocation under concurrent TLB invalidations\n\nWith concurrent TLB invalidations, completion wait randomly gets timed out\nbecause cmd_sem_val was incremented outside the IOMMU spinlock, allowing\nCMD_COMPL_WAIT commands to be queued out of sequence and breaking the\nordering assumption in wait_on_sem().\nMove the cmd_sem_val increment under iommu->lock so completion sequence\nallocation is serialized with command queuing.\nAnd remove the unnecessary return.\n\n## Affected\n\n- `Linux >= f2f65b28d802a667119147444ec2ae33eebf9a58 < d51bf43193b1e95dc4e34e540dc76e19def2ae5a`\n- `Linux >= 715c263119fd1b918a9fcbd8a36ea5b604a46324 < fca7aa0264ae99e5ff287d0ced5af0b82b121c4f`\n- `Linux >= e15768e68820142077bbca402d8e902f64ade1b0 < 5000ce7fcb31067566a1a1a2e5b5bbff93625242`\n- `Linux >= 496269d12072ecb219826485bdbec70c92a8eef5 < 48caa7542a795c9679ec1bd1bc2592e05a7369a4`\n- `Linux >= d2a0cac10597068567d336e85fa3cbdbe8ca62bf < 9e249c48412828e807afddc21527eb734dc9bd3d`\n- `Linux 69d9339c02eddfc2a345be7220651068a3684383`\n- `Linux >= 6.1.191 < 6.2`\n- `Linux >= 6.6.128 < 6.6.140`\n- `Linux >= 6.12.75 < 6.12.88`\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":[]}