FKIE_CVE-2026-43220

Vulnerability from fkie_nvd - Published: 2026-05-06 12:16 - Updated: 2026-05-17 16:16
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d51bf43193b1e95dc4e34e540dc76e19def2ae5a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fca7aa0264ae99e5ff287d0ced5af0b82b121c4f
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
To clipboard 

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  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B503BA3C-31FA-4897-85F6-EECE0EE4668F",
              "versionEndExcluding": "6.7",
              "versionStartIncluding": "6.6.128",
              "vulnerable": true
            },
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "operator": "OR"
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  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-43220",
  "lastModified": "2026-05-17T16:16:16.630",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-05-06T12:16:41.660",
  "references": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
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      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}


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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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