Use-after-free in Linux kernel - CVE-2026-64265

Vulnerability identifier: #VU139728

CSH Severity: Low

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

CVE-ID: CVE-2026-64265

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to disclose sensitive information or cause memory corruption.

The vulnerability exists due to a use-after-free in fuse_read_interrupt and FUSE request interrupt list handling when processing interrupted requests that are resent and later removed after a fatal signal. A local user can trigger request requeueing and request removal to disclose sensitive information or cause memory corruption.

Exploitation requires a previously interrupted request to remain linked on the interrupts list and a subsequent fatal signal before the interrupt list is processed.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1011.11, 7.0.0-1014.14
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13
linux-azure-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1

• https://git.kernel.org/stable/c/1d8ecd0cd696a5df0b2f72046a4ccee5d2a8ec2c
• https://git.kernel.org/stable/c/7366e6f4d2b4c7002b13fb01219e83679dad4127
• https://git.kernel.org/stable/c/893479015cb6442fd389d3b553ab3036c9541715
• https://git.kernel.org/stable/c/f8fce75fedf73ac72aa09163deb8f4291fdcaad2

• Use-after-free in Linux kernel fuse
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-oracle-7.0
• Ubuntu update for linux-azure
• Ubuntu update for linux-azure-7.0