CVE-2024-44947: fuse: Initialize beyond-EOF page contents before setting uptodate
First published: Mon Sep 02 2024(Updated: )
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).
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=2.6.36<4.19.321 | |
| Linux Linux kernel | >=4.20<5.4.283 | |
| Linux Linux kernel | >=5.5<5.10.225 | |
| Linux Linux kernel | >=5.11<5.15.166 | |
| Linux Linux kernel | >=5.16<6.1.107 | |
| Linux Linux kernel | >=6.2<6.6.48 | |
| Linux Linux kernel | >=6.7<6.10.7 | |
| Linux Linux kernel | =6.11-rc1 | |
| Linux Linux kernel | =6.11-rc2 | |
| Linux Linux kernel | =6.11-rc3 | |
| debian/linux | <=5.10.223-1 | 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- 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://lore.kernel.org/linux-cve-announce/2024090219-CVE-2024-44947-f49c@gregkh/T
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2309273
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-44947
- https://nvd.nist.gov/vuln/detail/CVE-2024-44947
- https://launchpad.net/bugs/cve/CVE-2024-44947
- https://security-tracker.debian.org/tracker/CVE-2024-44947
- https://ubuntu.com/security/CVE-2024-44947
- https://git.kernel.org/linus/3c0da3d163eb32f1f91891efaade027fa9b245b9
- https://project-zero.issues.chromium.org/issues/42451729
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