Use-after-free in Linux kernel - CVE-2026-64008

Vulnerability identifier: #VU138638

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2026-64008

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 rocket_ioctl_create_bo() and subsequent GEM handle lookups when processing ioctl requests with a dangling GEM handle. A local user can trigger create_bo failure conditions and then reuse the stale handle in later ioctls to cause a denial of service.

Exploitation requires access to the affected device interface and use of a freed handle through PREP_BO, FINI_BO, or SUBMIT operations.

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/18abd88d19ea195e2e1547fca0970c2f91d77a42
• https://git.kernel.org/stable/c/451f1ccbbdb7b65021646704b15902655f8d228a
• https://git.kernel.org/stable/c/f706e6a4ce75585af979aec3dcbdce68bc76306b

• Use-after-free in Linux kernel accel rocket 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