Double free in Linux kernel - CVE-2026-64054
Published: July 20, 2026
Vulnerability identifier: #VU138595
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-64054
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-64054
Install security update from vendor's repository.