2348902 – (CVE-2025-21815) CVE-2025-21815 kernel: mm/compaction: fix UBSAN shift-out-of-bounds warning

Bug 2348902 (CVE-2025-21815) - CVE-2025-21815 kernel: mm/compaction: fix UBSAN shift-out-of-bounds warning

Summary: CVE-2025-21815 kernel: mm/compaction: fix UBSAN shift-out-of-bounds warning

Keywords:
Status:	NEW
Alias:	CVE-2025-21815
Product:	Security Response
Classification:	Other
Component:	vulnerability
Sub Component:
Version:	unspecified
Hardware:	All
OS:	Linux
Priority:	medium
Severity:	medium
Target Milestone:	---
Assignee:	Product Security
QA Contact:
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+	depends on / blocked

Reported:	2025-02-27 21:02 UTC by OSIDB Bzimport
Modified:	2026-01-26 16:23 UTC (History)
CC List:	4 users (show)
Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2026:1236	0	None	None	None	2026-01-26 16:23:29 UTC

Description OSIDB Bzimport 2025-02-27 21:02:35 UTC

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

mm/compaction: fix UBSAN shift-out-of-bounds warning

syzkaller reported a UBSAN shift-out-of-bounds warning of (1UL << order)
in isolate_freepages_block().  The bogus compound_order can be any value
because it is union with flags.  Add back the MAX_PAGE_ORDER check to fix
the warning.

Comment 1 Avinash Hanwate 2025-02-28 05:24:52 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022709-CVE-2025-21815-19c9@gregkh/T

Comment 3 errata-xmlrpc 2026-01-26 16:23:28 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:1236 https://access.redhat.com/errata/RHSA-2026:1236

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