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CVE-2024-50191

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ext4: don't set SB_RDONLY after filesystem errors When the filesystem is mounted with errors=remount-ro, we were setting SB_RDO…

Published Nov 8, 2024EPSS 0.21%

Overview

CVE-2024-50191 is a medium-severity vulnerability. It was published on November 8, 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:

ext4: don't set SB_RDONLY after filesystem errors

When the filesystem is mounted with errors=remount-ro, we were setting

SB_RDONLY flag to stop all filesystem modifications. We knew this misses

proper locking (sb->s_umount) and does not go through proper filesystem

remount procedure but it has been the way this worked since early ext2

days and it was good enough for catastrophic situation damage

mitigation. Recently, syzbot has found a way (see link) to trigger

warnings in filesystem freezing because the code got confused by

SB_RDONLY changing under its hands. Since these days we set

EXT4_FLAGS_SHUTDOWN on the superblock which is enough to stop all

filesystem modifications, modifying SB_RDONLY shouldn't be needed. So

stop doing that.

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/58c0648e4c773f5b54f0cb63bc8c7c6bf52719a9Refgit.kernel.org/stable/c/d3476f3dad4ad68ae5f6b008ea6591d1520da5d8Refgit.kernel.org/stable/c/ee77c388469116565e009eaa704a60bc78489e09Reflists.debian.org/debian-lts-announce/2025/01/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-50191?

CVE-2024-50191 is a medium-severity vulnerability. It was published on November 8, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-50191?

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-2024-50191?

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-2024-50191?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-50191 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.

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