Use-after-free in Linux kernel - CVE-2026-64023
Published: July 20, 2026
Vulnerability identifier: #VU138619
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64023
CWE-ID: CWE-416
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 use-after-free in the gpio aggregator lookup table handling in drivers/gpio/gpio-aggregator.c when processing concurrent lookup operations during error cleanup. A local user can trigger a race condition that causes gpiod_find() to dereference freed memory to cause a denial of service.
The issue occurs when a concurrent thread reaches gpiod_match_lookup_table() before the lookup table entry is removed.
How to mitigate CVE-2026-64023
Install security update from vendor's repository.