CVE-2026-53284: btrfs: only release the dirty pages io tree after successful writes
btrfs: only release the dirty pages io tree after successful writes
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Enable clearing one-time warnings by writing `1` to `/sys/kernel/debug/clear_warn_once` as part of the test/workflow (`echo 1 > /sys/kernel/debug/clear_warn_once`).
Linux kernel (btrfs) clear_warn_once (debugfs) = 1 - Compensating control
After an unmount failure/incident, ensure the BTRFS filesystem is treated as read-only (`forced readonly` / `Readonly filesystem` is observed in the log) and remount only after the underlying issue is resolved.
- Operational
Clear prior kernel logs before reproducing/validating the issue by running `dmesg -C` (so subsequent WARNING messages can be detected reliably).
Event History
Frequently Asked Questions
What access does an attacker need to exploit this issue?
The CVSS vector rates it as network-reachable with low attack complexity and requiring no privileges or user interaction. The provided data does not describe a specific exploit path or required filesystem state.
What is the expected security impact?
The rating indicates a high-severity availability impact, with no confidentiality or integrity impact assessed. The reported failure can abort a Btrfs transaction and force the filesystem into read-only mode.
How can I tell whether a system has encountered this condition?
Relevant signs include BTRFS transaction write failures, an emergency shutdown, messages that a transaction was aborted or skipped, and the filesystem being forced read-only. A warning about dirty extent buffers during unmount may also appear.
What should operators do if these errors occur?
Treat the filesystem as having entered a forced read-only state after a transaction write failure and investigate the underlying write error. The supplied references identify stable-kernel fixes, but no fixed kernel versions are provided.