CVE-2025-39779

In the Linux kernel, the following vulnerability has been resolved: btrfs: subpage: keep TOWRITE tag until folio is cleaned btrfssubpagesetwriteback calls foliostartwriteback the first time a folio is written back, and it also clears the PAGECACHETAGTOWRITE tag even if there are still dirty block...

CVE-2025-39779

Summary: CVE-2025-39779 is a Linux kernel vulnerability in btrfs subpage handling. The issue occurs when btrfs_subpage_set_writeback() clears the PAGECACHE_TAG_TOWRITE tag on a folio that still has dirty blocks, breaking WB_SYNC_ALL/ordering guarantees and potentially causing a failure (e.g., an ...

CVE-2025-39779 btrfs: subpage: keep TOWRITE tag until folio is cleaned

In the Linux kernel, the following vulnerability has been resolved: btrfs: subpage: keep TOWRITE tag until folio is cleaned btrfssubpagesetwriteback calls foliostartwriteback the first time a folio is written back, and it also clears the PAGECACHETAGTOWRITE tag even if there are still dirty block...