CVE-2026-72438
Published: August 18, 2026Last modified: November 3, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: md/raid10: fix writes_pending and barrier reference leaks on discard failures raid10_make_request() acquires a writes_pending reference with md_write_start() before calling raid10_handle_discard(). Several failure paths in raid10_handle_discard() complete the bio and return without releasing the corresponding reference, causing md_write_end() to be skipped. Call md_write_end() before returning from these failure paths to keep writes_pending accounting balanced. Additionally, discard split allocation failures can occur after wait_barrier() succeeds. Those paths return without calling allow_barrier(), leaking the associated barrier reference. Release the barrier before returning from those paths.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.191-r0) |
| 25 LTS | linux-lts | Fixed (6.12.111-r0) | |
| Stream | linux-lts | Fixed (6.18.53-r0) |
References
- https://git.kernel.org/stable/c/11b35d1906a7277a3d64afe34224133b44327328
- https://git.kernel.org/stable/c/2d264c00beadcc67f16d683ab27eed28c047ba2e
- https://git.kernel.org/stable/c/393d687131d8aa8c7e4de2cb494438e145d20fc2
- https://git.kernel.org/stable/c/80ac31cce55432034a9eb98262c92ace7866e494
- https://git.kernel.org/stable/c/d1324b41dabd26787559efaeb430643c627c1eb0
- https://git.kernel.org/stable/c/fea33968592559a55a3f5a96a6386bebcaf988a8