SB20260727314 - Improper resource shutdown or release in Linux kernel fuse

Description

This security bulletin contains information about 1 vulnerability.

1) Improper resource shutdown or release (CVE-ID: CVE-2026-64262)

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

CVSSv4: 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]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper resource shutdown in fuse_uring_send_in_task() in fs/fuse/dev_uring.c when handling io_uring cancel task work for FUSE requests. A local user can trigger request cancellation to cause a denial of service.

The issue can leave the associated fuse_req unended, causing syscall threads to block in D-state, and repeated cancellations can stall later background operations by exhausting the background request limit.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4f45f276d5b4412eade6f74f2e37f3adba0473ed
• https://git.kernel.org/stable/c/bb476ef8e1027a9d509fbaaf81f5061a07e9e5a7
• https://git.kernel.org/stable/c/bea4fe98204b6ce7eb8e29f7bf867dd7619b3ddd