CVE-2024-44947

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> fuse: Initialize beyond-EOF page contents before setting uptodate<br /> <br /> fuse_notify_store(), unlike fuse_do_readpage(), does not enable page<br /> zeroing (because it can be used to change partial page contents).<br /> <br /> So fuse_notify_store() must be more careful to fully initialize page<br /> contents (including parts of the page that are beyond end-of-file)<br /> before marking the page uptodate.<br /> <br /> The current code can leave beyond-EOF page contents uninitialized, which<br /> makes these uninitialized page contents visible to userspace via mmap().<br /> <br /> This is an information leak, but only affects systems which do not<br /> enable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the<br /> corresponding kernel command line parameter).