Bug 2482074 (CVE-2026-46095)

Summary: CVE-2026-46095 kernel: md/md-llbitmap: raise barrier before state machine transition
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel's RAID (Redundant Array of Independent Disks) driver component. A race condition can occur when the system attempts to write or discard data, as a necessary synchronization barrier is not properly established before critical state changes. This oversight could lead to unpredictable system behavior or compromise data integrity.
 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 2026-05-27 15:10:04 UTC 
In the Linux kernel, the following vulnerability has been resolved:

md/md-llbitmap: raise barrier before state machine transition

Move the barrier raise operation before calling llbitmap_state_machine()
in both llbitmap_start_write() and llbitmap_start_discard(). This
ensures the barrier is in place before any state transitions occur,
preventing potential race conditions where the state machine could
complete before the barrier is properly raised.
Comment 1 Keith Grant 2026-05-27 16:52:04 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052703-CVE-2026-46095-2758@gregkh/T