SB2026080615 - Use-after-free in Linux kernel mac80211

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Main Vulnerability Database SB2026080615

SB2026080615 - Use-after-free in Linux kernel mac80211

Published: August 6, 2026

Security Bulletin ID SB2026080615
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) Use-after-free (CVE-ID: CVE-2026-64574)

CWE-ID: CWE-416 - Use After Free

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 a use-after-free in ieee80211_if_read_link and related mac80211 link handling when reading debugfs link files after a vif link update error path leaves stale debugfs entries for newly added links. A local user can open and read a debugfs link file referencing freed memory to cause a denial of service.

The issue is triggered when drv_change_vif_links() fails after new links have been allocated and initialized.


Remediation

Install update from vendor's website.

References