SB20260727317 - Use-after-free in Linux kernel fuse

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-64265)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• 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