CVE-2024-44947
Published: September 4, 2024Last modified: September 4, 2024
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).
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.5 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | NONE |
| Availability impact | NONE |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.110-r0) |
| Stream | linux-lts | Fixed (6.6.58-r0) |
References
- 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
- https://project-zero.issues.chromium.org/issues/42451729