In the Linux kernel, the following vulnerability has been resolved:
fuse: Initialize beyond-EOF page contents before setting uptodate
fuse_notify_store(), unlike fuse_do_readpage(), does not enable page
zeroing (because it can be used to change partial page contents).
So fuse_notify_store() must be more careful to fully initialize page
contents (including parts of the page that are beyond end-of-file)
before marking the page uptodate.
The current code can leave beyond-EOF page contents uninitialized, which
makes these uninitialized page contents visible to userspace via mmap().
This is an information leak, but only affects systems which do not
enable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the
corresponding kernel command line parameter).
git.kernel.org/stable/c/18a067240817bee8a9360539af5d79a4bf5398a5
git.kernel.org/stable/c/33168db352c7b56ae18aa55c2cae1a1c5905d30e
git.kernel.org/stable/c/3c0da3d163eb32f1f91891efaade027fa9b245b9
git.kernel.org/stable/c/4690e2171f651e2b415e3941ce17f2f7b813aff6
git.kernel.org/stable/c/49934861514d36d0995be8e81bb3312a499d8d9a
git.kernel.org/stable/c/831433527773e665bdb635ab5783d0b95d1246f4
git.kernel.org/stable/c/8c78303eafbf85a728dd84d1750e89240c677dd9
git.kernel.org/stable/c/ac42e0f0eb66af966015ee33fd355bc6f5d80cd6