Use-after-free in Linux kernel - CVE-2026-64023

Vulnerability identifier: #VU138619

CSH Severity: Low

CVSS v4: 5.7 [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]

CVE-ID: CVE-2026-64023

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Ubuntu
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

• https://git.kernel.org/stable/c/30c073cab97afb31901f94de9605177b6b84367e
• https://git.kernel.org/stable/c/7ac4183a41ba048af89eddd82fe8be64619d0871
• https://git.kernel.org/stable/c/ea28b286649b70618e9dd3e895812417a7712a11

• Use-after-free in Linux kernel gpio driver
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia