---
cve: "CVE-2026-52931"
severity: "CRITICAL"
cvss: 9.8
epss: "0.4%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-06-24 08:16:23"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-23T01:27:55+02:00"
---

# CVE-2026-52931

> 9.8 CRITICAL

## Beschreibung

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.

## CNA-Record (Kanon, cvelistV5)

- CNA: **Linux**
- State: PUBLISHED
- Stand: 2026-10-19 19:47:08
- CNA-CVSS: **9.8** (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Schwachstellen-Klasse

- **CWE-457** — Use of Uninitialized Variable
  The code uses a variable that has not been initialized, leading to unpredictable or unintended results.

## Patch verfügbar (OSV)

- Kernel ≥ 5.10.258
- Kernel ≥ 5.15.209
- Kernel ≥ 6.1.175
- Kernel ≥ 6.6.142
- Kernel ≥ 6.12.92
- Kernel ≥ 6.18.34
- Kernel ≥ 7.0.11

## BSI-Hinweise (deutsch)

- [Linux Kernel: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-2056) — _BSI-Einstufung: hoch_
  Ein Angreifer kann mehrere Schwachstellen im Linux Kernel ausnutzen, um einen Denial-of-Service-Angriff  auszulösen oder andere, nicht näher spezifizierte Angriffe durchzuführen.

## Referenzen

- <https://git.kernel.org/stable/c/0e388af04b3958b178a1b979527f93eb46ea1fee>
- <https://git.kernel.org/stable/c/1a21c055f66e78973712a4a1be2a554f1ee2e4f4>
- <https://git.kernel.org/stable/c/9884c9c02d3c90e9215db3c5128f59045d20ae91>
- <https://git.kernel.org/stable/c/53f931e0146ae5bdab4cba302646827d06b3794b>
- <https://git.kernel.org/stable/c/ecdaa3e4d91040206afe21bc8a0d1198a0971ff3>
- <https://git.kernel.org/stable/c/dc2ae5fbd2dadc26735092f140b246841d969a11>
- <https://git.kernel.org/stable/c/85397e48afe6be83ffca5ad3f4792296bfc81d3d>
- <https://git.kernel.org/stable/c/6c65cf23d4c6170fcf5714c32aa64689718cb142>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-52931/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_