CVE-2025-39738

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

btrfs: do not allow relocation of partially dropped subvolumes

[BUG]

There is an internal report that balance triggered transaction abort,

with the following call trace:

item 85 key (594509824 169 0) itemoff 12599 itemsize 33

extent refs 1 gen 197740 flags 2

ref#0: tree block backref root 7

item 86 key (594558976 169 0) itemoff 12566 itemsize 33

extent refs 1 gen 197522 flags 2

ref#0: tree block backref root 7

...

BTRFS error (device loop0): extent item not found for insert, bytenr 594526208 num_bytes 16384 parent 449921024 root_objectid 934 owner 1 offset 0

BTRFS error (device loop0): failed to run delayed ref for logical 594526208 num_bytes 16384 type 182 action 1 ref_mod 1: -117

------------[ cut here ]------------

BTRFS: Transaction aborted (error -117)

WARNING: CPU: 1 PID: 6963 at ../fs/btrfs/extent-tree.c:2168 btrfs_run_delayed_refs+0xfa/0x110 [btrfs]

And btrf

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References