SB20260720143 - Use of Uninitialized Variable in Linux kernel batman-adv

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Main Vulnerability Database SB20260720143

SB20260720143 - Use of Uninitialized Variable in Linux kernel batman-adv

Published: July 20, 2026

Security Bulletin ID SB20260720143
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use of Uninitialized Variable (CVE-ID: CVE-2026-64088)

CWE-ID: CWE-457 - Use of Uninitialized Variable

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to uninitialized memory exposure in batadv_send_other_tt_response() and batadv_tt_prepare_tvlv_global_data() when handling tt changeset response data. A remote attacker can trigger processing of an oversized tt_buff_len value to disclose sensitive information.

The issue is caused by a signed integer field wrapping to a negative value and then being widened with sign extension, resulting in a fully allocated buffer that is only partially initialized.


Remediation

Install update from vendor's website.

References