Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-89996

Vulnerability identifier: #VU150297

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-89996

CWE-ID: CWE-772

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to leak dma-buf file descriptors.

The vulnerability exists due to improper resource management in DMA_HEAP_IOCTL_ALLOC handling when copying allocation results to userspace fails. A local user can trigger a copy_to_user failure to leak dma-buf file descriptors.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.113-1

• https://git.kernel.org/stable/c/0d4a5d218055db29b50cc07d3d73d27007c2a391
• https://git.kernel.org/stable/c/30d0aff2c65a277135cfd8ea28fa1ee75e0ea4e0
• https://git.kernel.org/stable/c/69d57dbadb27ffd5eef34fd184bab145500cdabc

• Missing Release of Resource after Effective Lifetime in Linux kernel dma-buf dma-heap DMA_HEAP_IOCTL_ALLOC handling
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more