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CVE-2026-43427 usb: class: cdc-wdm: fix reordering issue in read code path

🗓️ 08 May 2026 14:22:00Reported by LinuxType 
cvelist
 cvelist
🔗 www.cve.org👁 25 Views

Fix reordering in usb cdc-wdm read path to stop copying uninitialized memory with write_once and barriers.

Related
Affected
Refs
[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/usb/class/cdc-wdm.c"
    ],
    "versions": [
      {
        "version": "afba937e540c902c989cd516fd97ea0c8499bb27",
        "lessThan": "638328ca9c17ae6511ad62198c57bae32ffa3c91",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "afba937e540c902c989cd516fd97ea0c8499bb27",
        "lessThan": "170e8daca24da6edb4be82ab01abf44e87af387b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "afba937e540c902c989cd516fd97ea0c8499bb27",
        "lessThan": "c8fa96ed021923dae147bcd9f9205b8df7b82360",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "afba937e540c902c989cd516fd97ea0c8499bb27",
        "lessThan": "4ee3062bf2c9a722afef429826e8607eaf3fc6a0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "afba937e540c902c989cd516fd97ea0c8499bb27",
        "lessThan": "276aef0fd2b92f41b920ac891c72cadeee957934",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "afba937e540c902c989cd516fd97ea0c8499bb27",
        "lessThan": "67ed312124bb1b61858778ac0b985b48961c862a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "afba937e540c902c989cd516fd97ea0c8499bb27",
        "lessThan": "e3c874b05901dc519054b5107d16620e6d2b5fea",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "afba937e540c902c989cd516fd97ea0c8499bb27",
        "lessThan": "8df672bfe3ec2268c2636584202755898e547173",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/usb/class/cdc-wdm.c"
    ],
    "versions": [
      {
        "version": "2.6.26",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "2.6.26",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.253",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.203",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.167",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.130",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.78",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.19",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.19.9",
        "lessThanOrEqual": "6.19.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

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