CVE-2026-53168

fuse: reject fuse_notify() pagecache ops on directories

State: Published
Severity: Not scored
Published: Jun 25, 2026
Updated: Oct 15, 2026
Reserved: Jun 9, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

fuse: reject fuse_notify() pagecache ops on directories

The operations FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE allow the FUSE daemon to actively write/read pagecache contents.

For directories with FOPEN_CACHE_DIR, the pagecache is used as kernel-internal cache storage, and userspace is not supposed to have direct access to this cache - in particular, fuse_parse_cache() will hit WARN_ON() if the cache contains bogus data.

Reject FUSE_NOTIFY_STORE and FUSE_NOTIFY_RETRIEVE on anything other than regular files with -EINVAL.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before 15487f98863dc7156ed43c5be26d478beb82ba35Affected 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before bd23fa0c16c5c86e5b7713224ffbb87d9db81ccaAffected 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before 9dbf1b2fadfc6c40805631d8a8276d1639fc9ab6Affected 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before dd92773d4d9cea010474eb08a5133c14ff6ab53aAffected 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before 99c317d7f8b7bbf3de16d20a01f363e390114ceaAffected 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before 12df4cfa738aefff21756728e91056d7defb0fe6Affected 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before e692f0cb86204dcdb9dddc0b355407eda6394a67Affected 5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before 9c954499d43aefac01c5dfb57a82b13d2dcf4b94Affected
LinuxLinux	4.20Affected before 4.20Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before 15487f98863dc7156ed43c5be26d478beb82ba35Affected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before bd23fa0c16c5c86e5b7713224ffbb87d9db81ccaAffected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before 9dbf1b2fadfc6c40805631d8a8276d1639fc9ab6Affected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before dd92773d4d9cea010474eb08a5133c14ff6ab53aAffected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before 99c317d7f8b7bbf3de16d20a01f363e390114ceaAffected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before 12df4cfa738aefff21756728e91056d7defb0fe6Affected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before e692f0cb86204dcdb9dddc0b355407eda6394a67Affected
5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 to before 9c954499d43aefac01c5dfb57a82b13d2dcf4b94Affected

LinuxLinux

4.20Affected
before 4.20Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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