CVE-2024-44947: linux kernel — Fix

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).

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weakness Type (CWE)

CWE-665 CWE-665

Affected Products

Vendor	Product	Versions
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	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

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

Other References

https://project-zero.issues.chromium.org/issues/42451729 https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Frequently Asked Questions

What is CVE-2024-44947? +

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). It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-44947? +

CVE-2024-44947 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-44947? +

CVE-2024-44947 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-44947? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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