SB20260720437 - Integer overflow in Linux kernel batman-adv

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Main Vulnerability Database SB20260720437

SB20260720437 - Integer overflow in Linux kernel batman-adv

Published: July 20, 2026

Security Bulletin ID SB20260720437
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Integer overflow (CVE-ID: CVE-2026-63836)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an integer overflow leading to divide-by-zero in batadv_tp_update_cwnd() in the batman-adv tp_meter component when processing crafted acknowledgment traffic. A local user can trigger the vulnerable calculation to cause a denial of service.

The issue occurs when the congestion window reaches 0x20000000, causing a left shift in the divisor to wrap to zero under 32-bit arithmetic.


Remediation

Install update from vendor's website.

References