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.

https://git.kernel.org/stable/c/12df4cfa738aefff21756728e91056d7defb0fe6

https://git.kernel.org/stable/c/15487f98863dc7156ed43c5be26d478beb82ba35

https://git.kernel.org/stable/c/99c317d7f8b7bbf3de16d20a01f363e390114cea

https://git.kernel.org/stable/c/9c954499d43aefac01c5dfb57a82b13d2dcf4b94

https://git.kernel.org/stable/c/9dbf1b2fadfc6c40805631d8a8276d1639fc9ab6

https://git.kernel.org/stable/c/bd23fa0c16c5c86e5b7713224ffbb87d9db81cca

https://git.kernel.org/stable/c/dd92773d4d9cea010474eb08a5133c14ff6ab53a

https://git.kernel.org/stable/c/e692f0cb86204dcdb9dddc0b355407eda6394a67

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