What’s Vulnerable › Vulnerabilities

CVE-2024-40938: landlock: Fix d_parent walk

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-07-12 · updated 2026-06-17

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]

Affected products

• Linux kernel: from 5.19 before 6.1.95; from 6.2 before 6.6.35; from 6.7 before 6.9.6; 6.10-rc1 — fixed in 6.1.95, 6.6.35, 6.9.6

How to fix

Upgrade to a fixed version: Linux kernel 6.1.95, 6.6.35, 6.9.6. Check the vendor advisory for mitigations.

References

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

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