CVE-2024-50191

ext4: don't set SB_RDONLY after filesystem errors

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.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/fbb177bc1d6487cd3e9b50ae0be2781b7297980d	patch
https://git.kernel.org/stable/c/4061e07f040a091f694f461b86a26cf95ae66439	patch
https://git.kernel.org/stable/c/58c0648e4c773f5b54f0cb63bc8c7c6bf52719a9	patch
https://git.kernel.org/stable/c/ee77c388469116565e009eaa704a60bc78489e09	patch
https://git.kernel.org/stable/c/d3476f3dad4ad68ae5f6b008ea6591d1520da5d8	patch

Frequently Asked Questions

What is the severity of CVE-2024-50191?: CVE-2024-50191 has been scored as a medium severity vulnerability.
How to fix CVE-2024-50191?: To fix CVE-2024-50191, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-50191 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-50191 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-50191?: CVE-2024-50191 affects Linux Linux, Linux Linux.

This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.