Bug 2468168 (CVE-2026-43358)

Summary:	CVE-2026-43358 kernel: btrfs: add missing RCU unlock in error path in try_release_subpage_extent_buffer()
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's btrfs filesystem. A missing Read-Copy Update (RCU) unlock in an error path within the `try_release_subpage_extent_buffer()` function could lead to system instability. This issue, identified by a thread-safety analyzer, may result in a denial of service condition, impacting system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-08 15:02:44 UTC

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

btrfs: add missing RCU unlock in error path in try_release_subpage_extent_buffer()

Call rcu_read_lock() before exiting the loop in
try_release_subpage_extent_buffer() because there is a rcu_read_unlock()
call past the loop.

This has been detected by the Clang thread-safety analyzer.

Comment 1 Keith Grant 2026-05-08 20:13:26 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050825-CVE-2026-43358-4b09@gregkh/T