Improper resource shutdown or release in Linux kernel - CVE-2026-64021

Vulnerability identifier: #VU138617

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-2026-64021

CWE-ID: CWE-404

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 improper resource shutdown or release in xe_oa_stream_open_ioctl() when handling an ioctl request with an exec queue whose width is greater than 1. A local user can send a crafted ioctl request to cause a denial of service.

The leaked exec queue reference can keep both the exec queue and the file private state pinned indefinitely.

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/04ef7592eaadd9ca8f8f66e76452f73525cff819
• https://git.kernel.org/stable/c/4b0c4f0c1b133d4bfa31c167200bcda646873328
• https://git.kernel.org/stable/c/4d25342543c01310fc4e0cba7cb17c775e2421e2

• Improper resource shutdown or release in Linux kernel drm xe 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