CVE-2024-49873

5.5 · MEDIUM

Published Oct 21, 2024 linux CWE-476 EPSS 0.20% (10th pctl) CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Overview

CVE-2024-49873 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:

mm/filemap: fix filemap_get_folios_contig THP panic

Patch series "memfd-pin huge page fixes".

Fix multiple bugs that occur when using memfd_pin_folios with hugetlb

pages and THP. The hugetlb bugs only bite when the page is not yet

faulted in when memfd_pin_folios is called. The THP bug bites when the

starting offset passed to memfd_pin_folios is not huge page aligned. See

the commit messages for details.

This patch (of 5):

memfd_pin_folios on memory backed by THP panics if the requested start

offset is not huge page aligned:

BUG: kernel NULL pointer dereference, address: 0000000000000036

RIP: 0010:filemap_get_folios_contig+0xdf/0x290

RSP: 0018:ffffc9002092fbe8 EFLAGS: 00010202

RAX: 0000000000000002 RBX: 0000000000000002 RCX: 0000000000000002

The fault occurs here, because xas_load returns a folio with value 2:

filemap_get_folios_contig()

for (folio = xas_load(&xas); folio && xas.xa_index <= end;

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	>= 6.11, < 6.11.3	Affected

References

Ref git.kernel.org/stable/c/570dd14bfecf281fa467c80f8ec92b26370ee36a Ref git.kernel.org/stable/c/c225c4f6056b46a8a5bf2ed35abf17a2d6887691

Frequently Asked Questions

What is CVE-2024-49873?

CVE-2024-49873 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-2024-49873?

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-2024-49873?

How can CyberStrike help with CVE-2024-49873?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-49873 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.

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