CVE-2026-64164

/// Technical description

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

btrfs: tracepoints: fix sleep while in atomic context in btrfs_sync_file()

The trace event btrfs_sync_file() is called in an atomic context (all trace

events are) and its call to dput(), which is needed due to the call to

dget_parent(), can sleep, triggering a kernel splat.

This can be reproduced by enabling the trace event and running btrfs/056

from fstests for example. The splat shown in dmesg is the following:

[53.919] BUG: sleeping function called from invalid context at fs/dcache.c:970

[53.947] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 32773, name: xfs_io

[53.988] preempt_count: 2, expected: 0

[53.967] RCU nest depth: 0, expected: 0

[53.943] Preemption disabled at:

[53.944] [<0000000000000000>] 0x0

[54.078] CPU: 0 UID: 0 PID: 32773 Comm: xfs_io Tainted: G W 7.1.0-rc1-btrfs-next-232+ #1 PREEMPT(full)

[54.070] Tainted: [W]=WARN

[54.071] Hardware name: QEMU Standard

/// 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