Riskcovery

CVE-2024-50191

ext4: don't set SB_RDONLY after filesystem errors

State
Published
Severity
5.5 Medium
Published
Nov 8, 2024
Updated
May 11, 2026
Reserved
Oct 21, 2024

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.15.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HCISA-ADP

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 95257987a6387f02970eda707e55a06cce734e18 to before 58c0648e4c773f5b54f0cb63bc8c7c6bf52719a9Affected
  • 95257987a6387f02970eda707e55a06cce734e18 to before ee77c388469116565e009eaa704a60bc78489e09Affected
  • 95257987a6387f02970eda707e55a06cce734e18 to before d3476f3dad4ad68ae5f6b008ea6591d1520da5d8Affected
LinuxLinux
  • 6.6Affected
  • before 6.6Not affected
  • 6.6.57 through 6.6.*Not affected
  • 6.11.4 through 6.11.*Not affected
  • 6.12 and laterNot affected

References

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