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CVE-2026-52931

Full vulnerability record from the local CVENow database.

Description

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.

Severity
CRITICAL
CVSS score
9.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-06-24 08:16:23.273000
Last modified
2026-10-19 20:18:47.920000
View original CVE JSON 
{
  "id": "CVE-2026-52931",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-06-24T08:16:23.273",
  "lastModified": "2026-10-19T20:18:47.920",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: avoid use of uninit sender vars\n\nbatadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the\nBATADV_TP_SENDER role. When called with a BATADV_TP_RECEIVER role, it\nproceeds to read sender-only members that were never initialized, leading\nto undefined behavior.\n\nThis can be triggered when a node that is currently acting as a receiver in\nan ongoing tp_meter session receives a malicious ACK packet.\n\nGuard against this by checking tp_vars->role immediately after the\nlookup and bailing out if it is not BATADV_TP_SENDER, before any of\nthose members are accessed."
    }
  ],
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      "affectedData": [
        {
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          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "programFiles": [
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              "versionType": "original_commit_for_fix",
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  ],
  "metrics": {
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        "type": "Secondary",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
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        "ssvcData": {
          "timestamp": "2026-10-16T15:22:56.523989Z",
          "id": "CVE-2026-52931",
          "options": [
            {
              "exploitation": "none"
            },
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              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
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  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
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          "value": "NVD-CWE-noinfo"
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          "value": "CWE-457"
        }
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  ],
  "configurations": [
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      "nodes": [
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          "negate": false,
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}