CVE-2024-49870

5.5 · MEDIUM

Published Oct 21, 2024 linux CWE-401 EPSS 0.24% (14th pctl) CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Overview

CVE-2024-49870 is a medium-severity vulnerability affecting linux linux_kernel. It was published on October 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

cachefiles: fix dentry leak in cachefiles_open_file()

A dentry leak may be caused when a lookup cookie and a cull are concurrent:

P1 | P2

-----------------------------------------------------------

cachefiles_lookup_cookie

cachefiles_look_up_object

lookup_one_positive_unlocked

// get dentry

cachefiles_cull

inode->i_flags |= S_KERNEL_FILE;

cachefiles_open_file

cachefiles_mark_inode_in_use

__cachefiles_mark_inode_in_use

can_use = false

if (!(inode->i_flags & S_KERNEL_FILE))

can_use = true

return false

// Returns an error but doesn't put dentry

After that the following WARNING will be triggered when the backend folder

is umounted:

==================================================================

BUG: Dentry 000000008ad87947{i=7a,n=D

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

Vendor	Product	Versions	Status
linux	linux_kernel	>= 5.17, < 6.1.113	Affected

References

Ref git.kernel.org/stable/c/7fa2382f97421978514a419c93054eca69f5247b Ref git.kernel.org/stable/c/c7d10fa7d7691558ff967668494672415f5fa151 Ref git.kernel.org/stable/c/d32ff64c872d7e08e893c32ba6a2374583444410 Ref git.kernel.org/stable/c/da6ef2dffe6056aad3435e6cf7c6471c2a62187c Ref git.kernel.org/stable/c/e4a28489b310339b2b8187bec0a437709be551c1 Ref lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Frequently Asked Questions

What is CVE-2024-49870?

CVE-2024-49870 is a medium-severity vulnerability affecting linux linux_kernel. It was published on October 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-49870?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-49870?

How can CyberStrike help with CVE-2024-49870?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-49870 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

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HackBrowser

Browser-based exploitation validates findings with real proof-of-concept.

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