CVE-2024-0564: linux kernel — Exploit

Description

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Weakness Type (CWE)

CWE-203 CWE-203

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.4.0-96.119 — 5.15.0-58
redhat	enterprise_linux	All
redhat	enterprise_linux	All

References

Exploits

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1680513

Other References

https://access.redhat.com/security/cve/CVE-2024-0564 https://bugzilla.redhat.com/show_bug.cgi?id=2258514 https://link.springer.com/conference/wisa https://wisa.or.kr/accepted https://access.redhat.com/security/cve/CVE-2024-0564 https://bugzilla.redhat.com/show_bug.cgi?id=2258514 https://link.springer.com/conference/wisa https://wisa.or.kr/accepted

Frequently Asked Questions

What is CVE-2024-0564? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2024-0564? +

CVE-2024-0564 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-0564? +

CVE-2024-0564 affects products from linux, redhat, specifically: enterprise_linux, linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-0564? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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