CVE-2024-0564

Kernel: max page sharing of kernel samepage merging (ksm) may cause memory deduplication

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A flaw was found in the Linux kernel's memory deduplication mechanism. The max page sharing of Kernel Samepage Merging (KSM), added in Linux kernel version 4.4.0-96.119, can create a side channel. When the attacker and the victim share the same host and the default setting of KSM is "max page sharing=256", it is possible for the attacker to time the unmap to merge with the victim's page. The unmapping time depends on whether it merges with the victim's page and additional physical pages are created beyond the KSM's "max page share". Through these operations, the attacker can leak the victim's page.

Se encontró un fallo en el mecanismo de deduplicación de memoria del kernel de Linux. El uso compartido máximo de páginas de Kernel Samepage Merging (KSM), agregado en la versión 4.4.0-96.119 del kernel de Linux, puede crear un canal lateral. Cuando el atacante y la víctima comparten el mismo host y la configuración predeterminada de KSM es "max page sharing=256", es posible que el atacante programe la desasignación para fusionarse con la página de la víctima. El tiempo de desasignación depende de si se fusiona con la página de la víctima y si se crean páginas físicas adicionales más allá del "max page share" de KSM. Mediante estas operaciones, el atacante puede filtrar la página de la víctima.

*Credits: N/A

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Adjacent

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2024-01-15 CVE Reserved
2024-01-30 CVE Published
2024-02-09 EPSS Updated
2024-10-16 CVE Updated
2024-10-16 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-99: Improper Control of Resource Identifiers ('Resource Injection')
CWE-203: Observable Discrepancy

CAPEC

References (5)

URL	Tag	Source
https://access.redhat.com/security/cve/CVE-2024-0564	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2258514	Issue Tracking
https://link.springer.com/conference/wisa	Not Applicable
https://wisa.or.kr/accepted	Not Applicable

URL	Date	SRC
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513	2024-10-16

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.4.0-96.119 <= 5.15.0-58 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.4.0-96.119 <= 5.15.0-58"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				9.0 Search vendor "Redhat" for product "Enterprise Linux" and version "9.0"		-		Affected