CVE-2026-98245

In the Linux kernel, the following vulnerability has been resolved: btrfs: take commit root semaphore when iterating in mark_block_group_to_copy() mark_block_group_to_copy() iterates over the commit root with skip_locking=true. A concurrent transaction commit can swap and free the commit root during iteration, causing use-after-free when accessing extent buffers. Fix it by using path->need_commit_sem to protect the commit root search.

• https://git.kernel.org/stable/c/0594e3423f4ba3137c734371169491f9a98e9af4
• https://git.kernel.org/stable/c/709f6a5e986535005110c6c69b322f63631cb200
• https://git.kernel.org/stable/c/8e2007b263ea250251ec3021a0a197da990ee1a8
• https://git.kernel.org/stable/c/c32490c6d3f3a9f2d177d57c7eb8bbc347561d08