CVE-2026-68459

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A potential deadlock exists in the f2fs balance fs() function when the device is mounted with the gc merge option. The issue occurs due to a circular dependency between a Kworker, a GC thread, and a Truncator. Specifically, the Kworker sets a writeback flag on a folio and waits for the GC thread to finish work via finish wait(fggc wq). Simultaneously, the Truncator locks a folio and waits for the writeback to clear via folio wait writeback(), while the GC thread is blocked attempting to lock the same folio in f2fs get lock data folio() during do garbage collect().

Recommendations As a temporary mitigation, avoid mounting the device with the gc merge mount option. At the moment, there is no information about a newer version that contains a fix for this vulnerability.