SB20260720183 - Double free in Linux kernel shaper
Published: July 20, 2026
Security Bulletin ID
SB20260720183
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Double free (CVE-ID: CVE-2026-64054)
CWE-ID: CWE-415 - Double 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 double free in net_shaper_nl_group_doit() when processing a GROUP request with duplicate NET_SHAPER_A_LEAVES entries. A local user can supply the same leaf handle twice to cause a denial of service.
The issue occurs when multiple supplied leaves reference the same parent, causing the same old-parent pointer to be stored twice in the cleanup list.
Remediation
Install update from vendor's website.