CVE-2024-44947
fuse: Initialize beyond-EOF page contents before setting uptodate
In the Linux kernel, the following vulnerability has been resolved:fuse: Initialize beyond-EOF page contents before setting uptodatefuse_notify_store(), unlike fuse_do_readpage(), does not enable pagezeroing (because it can be used to change partial page contents).So fuse_notify_store() must be more careful to fully initialize pagecontents (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, whichmakes these uninitialized page contents visible to userspace via mmap().This is an information leak, but only affects systems which do notenable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or thecorresponding kernel command line parameter).
- Affected
- Linux
- CVSS v3.1 NVD
- 5.5 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - EPSS
- 0.89% chance of exploitation in the next 30 days, 59th percentile
- Published
- 2024-09-02
- Updated
- 2026-05-11
Proof-of-concept exploits (1)
- Abdurahmon3236/CVE-2024-449470★ · 2024-09-03
Security advisories
- https://git.kernel.org/stable/c/18a067240817bee8a9360539af5d79a4bf5398a5
- https://git.kernel.org/stable/c/33168db352c7b56ae18aa55c2cae1a1c5905d30e
- https://git.kernel.org/stable/c/3c0da3d163eb32f1f91891efaade027fa9b245b9
- https://git.kernel.org/stable/c/4690e2171f651e2b415e3941ce17f2f7b813aff6
- https://git.kernel.org/stable/c/49934861514d36d0995be8e81bb3312a499d8d9a
- https://git.kernel.org/stable/c/831433527773e665bdb635ab5783d0b95d1246f4
- https://git.kernel.org/stable/c/8c78303eafbf85a728dd84d1750e89240c677dd9
- https://git.kernel.org/stable/c/ac42e0f0eb66af966015ee33fd355bc6f5d80cd6