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bpf: Reject fragmented frames in devmap

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: Reject fragmented frames in devmap Devmap broadcast redirects clone the packet for all but the last destination. For native XDP, that clone path copies only the linear xdp_frame data, while fragmented frames keep skb_shared_info in tailroom outside the linear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but without valid frag metadata, and the later free path can interpret uninitialized tail data as skb_shared_info, leading to an out-of-bounds access during frame return. Reject fragmented native XDP frames in dev_map_enqueue_clone(). Add the same restriction to the generic XDP clone path in dev_map_redirect_clone(). Generic XDP represents fragmented packets as nonlinear skbs, and rejecting them here keeps clone-based broadcast support aligned between native and generic XDP.

Announced Source revision 1
Original source ↗

CVE-2026-64355

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-2026-64355

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": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "47baddc856ae7e93a565dd9deeb797999b179466",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "07a4c11ee8ef4abcb39d922e9e410ae269671cdf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "bccbab36ff228e0825eb85d9b0f9b8434cd0a399",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "c5b4f5efcb55c1af3fe44ff712d31b7fb098a831",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "a9bb2d9c798cb62a4050a991c27b752770c33afe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "51d07c12ca411e692c424ecdabf077f1e61a61be",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "aa496720618f1a6054f1c870bf10b4f6c99bf656",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/bpf/devmap.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.96",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.39",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/bpf/devmap.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64355

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#41013 · Revision 1
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Publisher date
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