Use-after-free in Linux kernel - CVE-2026-64099

Vulnerability identifier: #VU138546

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-2026-64099

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 v3d CPU job ioctl error path when handling CPU job submission failures. A local user can trigger an error path with crafted CPU job submissions to cause a denial of service.

The same error path can also trigger a NULL dereference and leak one sync object reference per query.

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/0f8efc45740b0628a787d1b0be8a0ddabd700625
• https://git.kernel.org/stable/c/69c2a1fec2e7ca25598180816f3bc56e1842eb41
• https://git.kernel.org/stable/c/acd55ea40d03e06f20a9986363019e0e5173990e
• https://git.kernel.org/stable/c/b0fe80c0b9250b35e2211bf3117e7aca814a21b0

• Use-after-free in Linux kernel drm v3d 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