CVE-2026-72440

/// Technical description

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

md/raid1: fix writes_pending and barrier reference leaks on write failures

raid1_make_request() acquires a writes_pending reference with

md_write_start() before calling raid1_write_request(). Several failure

paths in raid1_write_request() complete the bio and return without

reaching the normal write completion path, causing the corresponding

md_write_end() to be skipped.

Make raid1_write_request() return a status indicating whether the write

request was successfully queued. This allows raid1_make_request() to

call md_write_end() when raid1_write_request() fails.

Additionally, if wait_blocked_rdev() fails after wait_barrier()

succeeds, the associated barrier reference is not released.

Call allow_barrier() before returning from that path to keep the barrier

accounting balanced.

/// 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