CVE-2025-37931

CVE-2025-37931 (btrfs) affects the Linux kernel’s btrfs metadata write path. The issue arises when writing subpage extent buffers (EBs) with a 64k page size, 16k nodsz, and a 4k sectorsize, where the bitmap addressing is based on sectors, yielding 4 bits per node. If a dirty range is found, the c...

CVE-2025-37931 btrfs: adjust subpage bit start based on sectorsize

In the Linux kernel, the following vulnerability has been resolved: btrfs: adjust subpage bit start based on sectorsize When running machines with 64k page size and a 16k nodesize we started seeing tree log corruption in production. This turned out to be because we were not writing out dirty bloc...