CVE-2025-21815

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

Published Feb 27, 2025 CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed

Description

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.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`3da0272a4c7d0d37b47b28e87014f421296fc2be`	affected	< 4491159774d973a9e2e998d25d8fbb20fada6dfa
`3da0272a4c7d0d37b47b28e87014f421296fc2be`	affected	< 10b7d3eb535098ccd4c82a182a33655d8a0e5c88
`3da0272a4c7d0d37b47b28e87014f421296fc2be`	affected	< d1366e74342e75555af2648a2964deb2d5c92200

Linux

affected

Version	Status	Constraints
`6.7`	affected	—
`0`	unaffected	< 6.7
`6.12.14`	unaffected	≤ 6.12.*
`6.13.3`	unaffected	≤ 6.13.*
`6.14`	unaffected	≤ *

Configuration 1 [-]

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2025-5984	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.
Ubuntu USN	USN-7521-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7521-2	Linux kernel (AWS) vulnerabilities
Ubuntu USN	USN-7521-3	Linux kernel vulnerabilities
Ubuntu USN	USN-7651-1	Linux kernel vulnerabilities
Ubuntu USN	USN-7651-2	Linux kernel vulnerabilities
Ubuntu USN	USN-7651-3	Linux kernel vulnerabilities
Ubuntu USN	USN-7651-4	Linux kernel (GCP) vulnerabilities
Ubuntu USN	USN-7651-5	Linux kernel (Raspberry Pi Real-time) vulnerabilities
Ubuntu USN	USN-7651-6	Linux kernel (Raspberry Pi) vulnerabilities
Ubuntu USN	USN-7652-1	Linux kernel (Real-time) vulnerabilities
Ubuntu USN	USN-7653-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-7737-1	Linux kernel (Azure) vulnerabilities

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.195% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/10b7d3eb535098ccd4c82a182a33655d8a0e5c88
https://git.kernel.org/stable/c/4491159774d973a9e2e998d25d8fbb20fada6dfa
https://git.kernel.org/stable/c/d1366e74342e75555af2648a2964deb2d5c92200
https://lore.kernel.org/linux-cve-announce/2025022709-CVE-2025-21815-19c9@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-21815
https://www.cve.org/CVERecord?id=CVE-2025-21815

History

Oct 28, 2025 3:00 AM First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
First Time appeared		Linux Linux linux Kernel
Weaknesses		CWE-125
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
Metrics	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}`	cvssV3_1 `{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'}`

May 14, 2025 3:00 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses	CWE-125	CWE-190

May 13, 2025 6:45 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics	cvssV3_1 `{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'}`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}`

Apr 2, 2025 3:30 PM Weaknesses updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-125
Metrics	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Low`	cvssV3_1 `{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'}` threat_severity `Moderate`

Feb 28, 2025 2:45 PM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://lore.kernel.org/linux-cve-announce/2025022709-CVE-2025-21815-19c9@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2025-21815 https://www.cve.org/CVERecord?id=CVE-2025-21815
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Low`

Feb 27, 2025 8:15 PM Description updated. Title updated. Added references View changes

Type	Values Removed	Values Added
Description		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.
Title		mm/compaction: fix UBSAN shift-out-of-bounds warning
References		https://git.kernel.org/stable/c/10b7d3eb535098ccd4c82a182a33655d8a0e5c88 https://git.kernel.org/stable/c/4491159774d973a9e2e998d25d8fbb20fada6dfa https://git.kernel.org/stable/c/d1366e74342e75555af2648a2964deb2d5c92200