CVE-2026-43361

A flaw was found in the Linux kernel's Btrfs filesystem. A malicious user can exploit this by repeatedly creating snapshots of a previously received subvolume. This action can lead to an item overflow, causing a transaction abort and forcing the filesystem into a read-only state. This results in a denial of service, disrupting system operations.

Red Hat acknowledges the upstream Linux kernel correction for «btrfs» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the btrfs module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.