CVE-2026-98245

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux78ce9fc269af6e69c1399ab910ba6bc81c934f67 < 8e2007b263ea250251ec3021a0a197da990ee1a8affected
LinuxLinux78ce9fc269af6e69c1399ab910ba6bc81c934f67 < 709f6a5e986535005110c6c69b322f63631cb200affected
LinuxLinux78ce9fc269af6e69c1399ab910ba6bc81c934f67 < c32490c6d3f3a9f2d177d57c7eb8bbc347561d08affected
LinuxLinux78ce9fc269af6e69c1399ab910ba6bc81c934f67 < 0594e3423f4ba3137c734371169491f9a98e9af4affected
LinuxLinux5.12affected
LinuxLinux0 < 5.12unaffected
LinuxLinux6.12.112 <= 6.12.*unaffected
LinuxLinux6.18.54 <= 6.18.*unaffected
LinuxLinux7.2.8 <= 7.2.*unaffected
LinuxLinux7.3-rc4 <= *unaffected

Weaknesses

References