Bug 2516580 (CVE-2026-72437) - CVE-2026-72437 kernel: md/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry
Summary: CVE-2026-72437 kernel: md/raid1: free r1_bio when REQ_NOWAIT is set and read ...
Keywords:
Status: NEW
Alias: CVE-2026-72437
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-15 06:20 UTC by OSIDB Bzimport
Modified: 2026-08-19 16:38 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-08-15 06:20:04 UTC 
In the Linux kernel, the following vulnerability has been resolved:

md/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry

When a read is retried, raid1_read_request() may be called with a
pre-allocated r1_bio. If wait_read_barrier() fails for a REQ_NOWAIT
read, the bio is completed and the function returns immediately. In this
case the existing r1_bio is leaked.

This fixes a leak of pre-allocated r1_bio structures for retried reads.
Comment 1 Keith Grant 2026-08-19 16:35:24 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081528-CVE-2026-72437-a3cd@gregkh/T
Note You need to log in before you can comment on or make changes to this bug.