Skip to main content
VulnerabilityPublished Updated

CVE-2026-63836: Linux kernel · batman-adv: tp_meter: avoid divide-by-zero for dec_cwnd

Affects Linux kernelSource GCVE Database

0
Compare

Not known to be exploited.

Data as of 12 Nov 2026, 20:41 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.

What to do

AI-suggested

A fix has been implemented in the Linux kernel to correct the calculation and avoid the divide-by-zero condition. Users should apply the official kernel updates that include this fix once available.

Description

A vulnerability in the Linux kernel's batman-adv module's tp_meter component involves a divide-by-zero error in the dec_cwnd calculation. The issue arises due to an arithmetic overflow when cwnd reaches a specific large value, causing a division by zero. The calculation has been corrected to avoid this overflow and prevent the invalid division.

References

Community reviews

Loading reviews…