Threats Tagged 'cve-2026-63820'

A vulnerability in the Linux kernel's f2fs filesystem was resolved that involved missing submission of read bio operations on large folio read errors. The issue could cause read bio operations to remain unsubmitted when an error occurs on a later folio, leading to indefinite waits on locked folios by readers. The fix ensures that any pending bio is submitted before returning on error and stops further readahead folios consumption once an error is detected.

In the Linux kernel, the following vulnerability has been resolved: f2fs: fix missing read bio submission on large folio error f2fs_read_data_large_folio() can keep a read bio across multiple readahead folios. If a later folio hits an error before any of its blocks are added to the bio, folio_in_bio is false and the current error path returns immediately after ending that folio. This can leave the bio accumulated for earlier folios unsubmitted. Those folios then never receive read completion, and readers can wait indefinitely on the locked folios. Route errors through the common out path so any pending bio is submitted before returning. Stop consuming more readahead folios once an error is seen, and only wait on and clear the current folio when it was actually added to the bio.