What’s Vulnerable › Vulnerabilities

CVE-2024-42250: cachefiles: add missing lock protection when polling

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-08-07 · updated 2026-08-04
• Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: cachefiles: add missing lock protection when polling Add missing lock protection in poll routine when iterating xarray, otherwise: Even with RCU read lock held, only the slot of the radix tree is ensured to be pinned there, while the data structure (e.g. struct cachefiles_req) stored in the slot has no such guarantee. The poll routine will iterate the radix tree and dereference cachefiles_req accordingly. Thus RCU read lock is not adequate in this case and spinlock is needed here.

Affected products

• Linux kernel: from 6.8 before 6.9.10 — fixed in 6.9.10

How to fix

Upgrade to a fixed version: Linux kernel 6.9.10. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6bb6bd3dd6f382dfd36220d4b210a0c77c066651
• https://git.kernel.org/stable/c/8eadcab7f3dd809edbe5ae20533ff843dfea3a07
• https://git.kernel.org/stable/c/97cfd5e20ddc2e33e16ce369626ce76c9a475fd7
• https://git.kernel.org/stable/c/cf5bb09e742a9cf6349127e868329a8f69b7a014
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

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