SB20260720144 - Signed to Unsigned Conversion Error in Linux kernel batman-adv

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Main Vulnerability Database SB20260720144

SB20260720144 - Signed to Unsigned Conversion Error in Linux kernel batman-adv

Published: July 20, 2026

Security Bulletin ID SB20260720144
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Signed to Unsigned Conversion Error (CVE-ID: CVE-2026-64089)

CWE-ID: CWE-195 - Signed to Unsigned Conversion Error

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an integer signedness error in batadv_send_my_tt_response() and batadv_tt_prepare_tvlv_local_data() when processing a translation table changeset length value larger than 32767. A local user can trigger the vulnerable code path to disclose sensitive information.

The issue occurs because a negative sign-extended length can cause a full-sized buffer to be allocated while only a small portion is populated, leaving the remaining bytes uninitialized.


Remediation

Install update from vendor's website.

References