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A vulnerability in the Linux kernel's F2FS filesystem was resolved that could cause filesystem shutdown due to inconsistent segment type information. The issue arises from a race condition between fallocate on a pinning file and block allocation, leading to migration of segments with mismatched in-memory and on-disk segment type data. This inconsistency triggers a filesystem stop to prevent corruption. The vulnerability affects multiple Linux kernel versions prior to specific fixed releases. A patch is available and included in updated Linux kernel packages. Users should apply the updates and reboot to mitigate the issue.

The Linux kernel F2FS filesystem had a vulnerability caused by a race condition during fallocate on pinning files, which could lead to do_garbage_collect() migrating a segment just allocated by a log. This results in a mismatch between the segment type in the in-memory log and the on-disk SSA block, causing detection of inconsistent segment types and subsequent filesystem shutdown. The root cause is the race between fallocate and block allocation leading to inconsistent segment type information between memory and disk structures. This vulnerability has been fixed in Linux kernel versions released after the affected versions listed. The fix is included in official Ubuntu security updates for various kernel flavors. No known exploits in the wild have been reported.

Detailed information about UBUNTU-CVE-2025-40150 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2025-40150 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid migrating empty section It reports a bug from device w/ zufs:… (CVE-2025-40150)

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