CVE-2025-39727

In the Linux kernel, the following vulnerability has been resolved: mm: swap: fix potential buffer overflow in setup_clusters() In setup_swap_map(), we only ensure badpages are in range (0, last_page]. As maxpages might be < last_page, setup_clusters() will encounter a buffer overflow when a badpage is >= maxpages. Only call inc_cluster_info_page() for badpage which is < maxpages to fix the issue.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/152c1339dc13ad46f1b136e8693de15980750835	Patch
https://git.kernel.org/stable/c/815c528b13f2bb9b3130c13bedeabf2351a68129	Patch
https://git.kernel.org/stable/c/91b370800b3f2b3dda244c0ab06719c4971190a5	Patch
https://git.kernel.org/stable/c/9b01ada580ee84fb319e7ecb5fb5b1f54a9eb799	Patch

Configurations

Configuration 1 (hide)

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

History

19 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: swap: solucionar un posible desbordamiento de búfer en setup_clusters() En setup_swap_map(), solo nos aseguramos de que las badpages estén en el rango (0, last_page]. Como maxpages podría ser < last_page, setup_clusters() encontrará un desbordamiento de búfer cuando una badpage sea >= maxpages. Solo llamar a inc_cluster_info_page() para badpage que sea < maxpages para solucionar el problema.

Information

Published : 2025-09-07 16:15

Updated : 2026-10-19 21:10

NVD link : CVE-2025-39727

Mitre link : CVE-2025-39727

CVE.ORG link : CVE-2025-39727

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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