CVE-2024-44947 : LINUX KERNEL UP TO 6.1.106/6.6.47/6.10.6 FUSE FUSE_NOTIFY_STORE INFORMATION DISCLOSURE

Description

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).

References

https://git.kernel.org/stable/c/831433527773e665bdb635ab5783d0b95d1246f4

https://git.kernel.org/stable/c/ac42e0f0eb66af966015ee33fd355bc6f5d80cd6

https://git.kernel.org/stable/c/18a067240817bee8a9360539af5d79a4bf5398a5

https://git.kernel.org/stable/c/3c0da3d163eb32f1f91891efaade027fa9b245b9

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