CVE-2025-68791

kernel: fuse: missing copy_finish in fuse-over-io-uring argument copies

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Severity

Low

Red Hat Product Security

3.3

CVSS 3.1

Review impact separately from score.

Published · January 13, 2026

Updated · June 28, 2026

Description

A reference count leak flaw was found in the Linux kernel's FUSE filesystem when using io_uring for argument copies. The copy_finish() function is not called in error paths, causing page reference counts to leak. This can lead to memory being pinned indefinitely and potential resource exhaustion.

Statement

This affects systems using FUSE filesystems with io_uring (a relatively new feature combination). The leak occurs during error handling of argument copies. Systems using traditional FUSE without io_uring are unaffected.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 3.3
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CWE-911 · Improper Update of Reference Count