CVE-2026-43220 (GCVE-0-2026-43220)
Vulnerability from cvelistv5
Published
2026-05-06 11:28
Modified
2026-05-17 15:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/amd: serialize sequence allocation under concurrent TLB invalidations With concurrent TLB invalidations, completion wait randomly gets timed out because cmd_sem_val was incremented outside the IOMMU spinlock, allowing CMD_COMPL_WAIT commands to be queued out of sequence and breaking the ordering assumption in wait_on_sem(). Move the cmd_sem_val increment under iommu->lock so completion sequence allocation is serialized with command queuing. And remove the unnecessary return.
References
Impacted products
Vendor Product Version
Linux Linux Version: f2f65b28d802a667119147444ec2ae33eebf9a58
Version: 715c263119fd1b918a9fcbd8a36ea5b604a46324
Version: e15768e68820142077bbca402d8e902f64ade1b0
Version: 496269d12072ecb219826485bdbec70c92a8eef5
Version: d2a0cac10597068567d336e85fa3cbdbe8ca62bf
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   Linux Linux Version: 6.6.128   ≤
Version: 6.12.75   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/amd/amd_iommu_types.h",
            "drivers/iommu/amd/init.c",
            "drivers/iommu/amd/iommu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d51bf43193b1e95dc4e34e540dc76e19def2ae5a",
              "status": "affected",
              "version": "f2f65b28d802a667119147444ec2ae33eebf9a58",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
            },
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              "status": "affected",
              "version": "496269d12072ecb219826485bdbec70c92a8eef5",
              "versionType": "git"
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              "status": "affected",
              "version": "d2a0cac10597068567d336e85fa3cbdbe8ca62bf",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/amd/amd_iommu_types.h",
            "drivers/iommu/amd/init.c",
            "drivers/iommu/amd/iommu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6.6.140",
              "status": "affected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.88",
              "status": "affected",
              "version": "6.12.75",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.140",
                  "versionStartIncluding": "6.6.128",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.88",
                  "versionStartIncluding": "6.12.75",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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_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-\u003elock so completion sequence\nallocation is serialized with command queuing.\nAnd remove the unnecessary return."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-17T15:21:38.711Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "iommu/amd: serialize sequence allocation under concurrent TLB invalidations",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43220",
    "datePublished": "2026-05-06T11:28:20.905Z",
    "dateReserved": "2026-05-01T14:12:55.994Z",
    "dateUpdated": "2026-05-17T15:21:38.711Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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