SB20261015108 - Improper initialization in Linux kernel mac80211

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Main Vulnerability Database SB20261015108

SB20261015108 - Improper initialization in Linux kernel mac80211

Published: October 15, 2026

Security Bulletin ID SB20261015108
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper initialization (CVE-ID: CVE-2026-98422)

CWE-ID: CWE-665 - Improper Initialization

CVSSv4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to trigger a kernel warning.

The vulnerability exists due to improper reinitialization of the crypto_tx_tailroom_needed_cnt counter in mac80211 AP_VLAN interface handling when bringing an AP_VLAN interface down. A local user can repeatedly bring the same AP_VLAN interface down and up while its parent AP interface remains up to trigger a kernel warning.

The sanity check detects a mismatch between the AP_VLAN interface's counter and the parent AP interface's counter.


Remediation

Install update from vendor's website.

References