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batman-adv: fix fragment reassembly length accounting

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix fragment reassembly length accounting batman-adv keeps a running payload length for queued fragments and uses it to validate a fragment chain before reassembly. That accounting currently allows the accumulated fragment length to be truncated during updates. As a result, malformed fragment chains can bypass the intended validation and drive reassembly with inconsistent length state, leading to a local denial of service. Fix the accounting by storing the accumulated length in a length-typed field and rejecting update overflows before the existing validation logic runs. The fix was verified against the original reproducer and against valid fragment reassembly paths.

Announced Source revision 1
Original source ↗

CVE-2026-52914

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-2026-52914

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": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
        "lessThan": "e4f3f6b818aa6a678bc54a2d4e0bece2303c6a64",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
        "lessThan": "37be61825b15534a16ff9cfc9546de155b6df982",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
        "lessThan": "975563c5de1123dde1ec7946bf5556d20c89d74e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
        "lessThan": "f653b040dad1af70fa5cd4fe085e4758925480c9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
        "lessThan": "e910dbf509125fe51ad68e4fa74dc8ab0a8e787a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
        "lessThan": "3eb8bcb823391bd58997831b3c9c152a4ba8e255",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
        "lessThan": "fdb2c96efb2baeb3725e9ce3ede8f1e36f5490f0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "610bfc6bc99bc83680d190ebc69359a05fc7f605",
        "lessThan": "9cd3f16c320bfdadd4509358122368deb56a5741",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/batman-adv/fragmentation.c",
      "net/batman-adv/types.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "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": [
      "net/batman-adv/fragmentation.c",
      "net/batman-adv/types.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-52914

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40688 · Revision 1
Added to Heist Feed
Publisher date
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