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batman-adv: tp_meter: avoid use of uninit sender vars

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: avoid use of uninit sender vars batadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the BATADV_TP_SENDER role. When called with a BATADV_TP_RECEIVER role, it proceeds to read sender-only members that were never initialized, leading to undefined behavior. This can be triggered when a node that is currently acting as a receiver in an ongoing tp_meter session receives a malicious ACK packet. Guard against this by checking tp_vars->role immediately after the lookup and bailing out if it is not BATADV_TP_SENDER, before any of those members are accessed.

Announced Source revision 1
Original source ↗

CVE-2026-52931

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-2026-52931

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": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
        "lessThan": "0e388af04b3958b178a1b979527f93eb46ea1fee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
        "lessThan": "1a21c055f66e78973712a4a1be2a554f1ee2e4f4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
        "lessThan": "9884c9c02d3c90e9215db3c5128f59045d20ae91",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
        "lessThan": "53f931e0146ae5bdab4cba302646827d06b3794b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
        "lessThan": "ecdaa3e4d91040206afe21bc8a0d1198a0971ff3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
        "lessThan": "dc2ae5fbd2dadc26735092f140b246841d969a11",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
        "lessThan": "85397e48afe6be83ffca5ad3f4792296bfc81d3d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "33a3bb4a3345bb511f9c69c913da95d4693e2a4e",
        "lessThan": "6c65cf23d4c6170fcf5714c32aa64689718cb142",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/batman-adv/tp_meter.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.8",
        "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/tp_meter.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-52931

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40699 · Revision 1
Added to Heist Feed
Publisher date
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