CVE-2026-53168

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 < 15487f98863dc7156ed43c5be26d478beb82ba35affected
LinuxLinux5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 < bd23fa0c16c5c86e5b7713224ffbb87d9db81ccaaffected
LinuxLinux5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 < 9dbf1b2fadfc6c40805631d8a8276d1639fc9ab6affected
LinuxLinux5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 < dd92773d4d9cea010474eb08a5133c14ff6ab53aaffected
LinuxLinux5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 < 99c317d7f8b7bbf3de16d20a01f363e390114ceaaffected
LinuxLinux5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 < 12df4cfa738aefff21756728e91056d7defb0fe6affected
LinuxLinux5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 < e692f0cb86204dcdb9dddc0b355407eda6394a67affected
LinuxLinux5d7bc7e8680c7ca4c8a4f139ce2a54ccb8131ef0 < 9c954499d43aefac01c5dfb57a82b13d2dcf4b94affected
LinuxLinux4.20affected
LinuxLinux0 < 4.20unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.94 <= 6.12.*unaffected
LinuxLinux6.18.36 <= 6.18.*unaffected
LinuxLinux7.0.13 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References