CVE-2026-72440

HighCVSS 7.1

Published: 15/08/2026(UTC)Updated: 17/08/2026(UTC)Translated: 15/08/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.36%

29th percentile - higher than 29% of all known CVEs

Summary

In the Linux kernel, the md/raid1 module has a vulnerability involving writes_pending and barrier reference leaks on write failures. Some error paths in raid1_write_request() complete the bio without calling md_write_end(), leading to unbalanced counters.

Risk Assessment

Reference leaks may lead to incorrect write mechanism behavior, potentially resulting in data loss or system crash.

Recommendation

Apply a Linux kernel update containing the fix that adds md_write_end() and allow_barrier() calls in error paths.

Original NVD description (English source)

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.