Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2024-49854

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for accessing waker_bfqq after splitting After commit 42c306ed7233 ("block, bfq: don't break merge chain in…

Published Oct 21, 2024CWE-416EPSS 0.21%

Overview

CVE-2024-49854 is a high-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

block, bfq: fix uaf for accessing waker_bfqq after splitting

After commit 42c306ed7233 ("block, bfq: don't break merge chain in

bfq_split_bfqq()"), if the current procress is the last holder of bfqq,

the bfqq can be freed after bfq_split_bfqq(). Hence recored the bfqq and

then access bfqq->waker_bfqq may trigger UAF. What's more, the waker_bfqq

may in the merge chain of bfqq, hence just recored waker_bfqq is still

not safe.

Fix the problem by adding a helper bfq_waker_bfqq() to check if

bfqq->waker_bfqq is in the merge chain, and current procress is the only

holder.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

Refgit.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7fRefgit.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583Refgit.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eafRefgit.kernel.org/stable/c/63a07379fdb6c72450cb05294461c6016b8b7726Refgit.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04feRefgit.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bdReflists.debian.org/debian-lts-announce/2025/01/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-49854?

CVE-2024-49854 is a high-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-49854?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-49854?

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

How can CyberStrike help with CVE-2024-49854?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-49854 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2024

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999