CVE-2024-40938: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: landlock: Fix d_parent walk The WARN_ON_ONCE() in collect_domain_accesses() can be triggered when trying to link a root mount point. This cannot work in practice because this directory is mounted, but the VFS check is done after the call to security_path_link(). Do not use source directory's d_parent when the source directory is the mount point. [mic: Fix commit message]

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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:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.19 — 6.1.95
linux	linux_kernel	6.2 — 6.6.35
linux	linux_kernel	6.7 — 6.9.6
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/88da52ccd66e65f2e63a6c35c9dff55d448ef4dc https://git.kernel.org/stable/c/b6e5e696435832b33e40775f060ef5c95f4fda1f https://git.kernel.org/stable/c/c7618c7b0b8c45bcef34410cc1d1e953eb17f8f6 https://git.kernel.org/stable/c/cc30d05b34f9a087a6928d09b131f7b491e9ab11 https://git.kernel.org/stable/c/88da52ccd66e65f2e63a6c35c9dff55d448ef4dc https://git.kernel.org/stable/c/b6e5e696435832b33e40775f060ef5c95f4fda1f https://git.kernel.org/stable/c/c7618c7b0b8c45bcef34410cc1d1e953eb17f8f6 https://git.kernel.org/stable/c/cc30d05b34f9a087a6928d09b131f7b491e9ab11

Other References

https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Frequently Asked Questions

What is CVE-2024-40938? +

In the Linux kernel, the following vulnerability has been resolved: landlock: Fix d_parent walk The WARN_ON_ONCE() in collect_domain_accesses() can be triggered when trying to link a root mount point. This cannot work in practice because this directory is mounted, but the VFS check is done after the call to security_path_link(). Do not use source directory's d_parent when the source directory is the mount point. [mic: Fix commit message] It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-40938? +

CVE-2024-40938 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-2024-40938? +

CVE-2024-40938 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-2024-40938? +

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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CVE-2024-40938