CVE-2026-64034 net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer

🗓️ 19 Jul 2026 15:39:23Reported by LinuxType

Fix time-of-check time-of-use by reading hwc message id once with read once and passing it to the handler.

Reporter	Title	Published	Views	Family All 57
Circl	CVE-2026-64034	3 Aug 202608:45	–	circl
CVE	CVE-2026-64034	19 Jul 202615:39	–	cve
Debian CVE	CVE-2026-64034	19 Jul 202615:39	–	debiancve
EUVD	EUVD-2026-45607	19 Jul 202615:39	–	euvd
NVD	CVE-2026-64034	19 Jul 202616:17	–	nvd
OSV	BELL-CVE-2026-64034	22 Jul 202606:05	–	osv
OSV	DEBIAN-CVE-2026-64034	19 Jul 202616:17	–	osv
OSV	UBUNTU-CVE-2026-64034	20 Jul 202600:00	–	osv
OSV	USN-8575-1 linux, linux-gcp, linux-gcp-fips, linux-gke, linux-gkeop, linux-hwe-5.15, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-realtime, linux-xilinx-zynqmp vulnerabilities	21 Jul 202610:01	–	osv
OSV	USN-8575-2 linux-aws, linux-aws-5.15, linux-aws-fips, linux-fips, linux-ibm, linux-nvidia vulnerabilities	23 Jul 202608:14	–	osv

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/ethernet/microsoft/mana/hw_channel.c"
    ],
    "versions": [
      {
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "a201c66edf2ebc6cfdc3813a889ba20fecebfae3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "70ad2dff8d052a85dfef15715b531f38a29108cf",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "566f42fb67a7ebfed6650e407e5b72e6b3e83bf7",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "6180a06bbc99fd9114b8db4be6c4d46e40f046ef",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "09ec063d87c2dd3fa6f3561361a017bd882e9f37",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "3c4db56ccd13dd020fbf43afabaee74a40ec75e4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "35f0f0a2536a4d604b4dbad92c85c4a8fdebb870",
        "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/net/ethernet/microsoft/mana/hw_channel.c"
    ],
    "versions": [
      {
        "version": "5.13",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.13",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.209",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.175",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.142",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.92",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.34",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0.11",
        "lessThanOrEqual": "7.0.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

Source	Link
git	www.git.kernel.org/stable/c/a201c66edf2ebc6cfdc3813a889ba20fecebfae3
git	www.git.kernel.org/stable/c/566f42fb67a7ebfed6650e407e5b72e6b3e83bf7
git	www.git.kernel.org/stable/c/70ad2dff8d052a85dfef15715b531f38a29108cf
git	www.git.kernel.org/stable/c/09ec063d87c2dd3fa6f3561361a017bd882e9f37
git	www.git.kernel.org/stable/c/3c4db56ccd13dd020fbf43afabaee74a40ec75e4
git	www.git.kernel.org/stable/c/6180a06bbc99fd9114b8db4be6c4d46e40f046ef
git	www.git.kernel.org/stable/c/35f0f0a2536a4d604b4dbad92c85c4a8fdebb870

05 Aug 2026 12:38Current

CVSS 3.19.3

EPSS0.00151