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

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer In mana_hwc_rx_event_handler(), resp->response.hwc_msg_id is read from DMA-coherent memory and bounds-checked, then mana_hwc_handle_resp() re-reads the same field from the same DMA buffer for test_bit() and pointer arithmetic. DMA-coherent memory is mapped uncacheable on x86 and is shared, unencrypted, in Confidential VMs (SEV-SNP/TDX), so each load goes directly to host-visible memory. A H/W can modify the value between the check and the use, bypassing the bounds validation. Fix this by reading hwc_msg_id exactly once using READ_ONCE() into a stack-local variable in mana_hwc_rx_event_handler(), and passing the validated value as a parameter to mana_hwc_handle_resp().

Announced Source revision 1
Original source ↗

CVE-2026-64034

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64034

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "a201c66edf2ebc6cfdc3813a889ba20fecebfae3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "70ad2dff8d052a85dfef15715b531f38a29108cf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "566f42fb67a7ebfed6650e407e5b72e6b3e83bf7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "6180a06bbc99fd9114b8db4be6c4d46e40f046ef",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "09ec063d87c2dd3fa6f3561361a017bd882e9f37",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "3c4db56ccd13dd020fbf43afabaee74a40ec75e4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
        "lessThan": "35f0f0a2536a4d604b4dbad92c85c4a8fdebb870",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/microsoft/mana/hw_channel.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.142",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.92",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.34",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.11",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/microsoft/mana/hw_channel.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64034

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40942 · Revision 1
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Publisher date
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