CVE-2024-0564 Kernel: max page sharing of kernel samepage merging (ksm) may cause memory deduplication
A local attacker on the same host can leak victim memory pages via a timing side channel in Linux kernel KSM memory deduplication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-0564?
CVE-2024-0564 is a medium-severity vulnerability in Linux kernel, published on 30 Jan 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-203
Which versions are affected by CVE-2024-0564?
It affects 2 products.
Products include Linux kernel, Redhat Enterprise Linux.
How do I fix CVE-2024-0564?
Apply the vendor's patch.
Is CVE-2024-0564 being exploited?
There is no known exploitation of CVE-2024-0564 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-110412, DEBIAN-CVE-2024-0564, GHSA-5m9g-m2vj-47r4, ROOT-OS-DEBIAN-12-CVE-2024-0564, ROOT-OS-DEBIAN-13-CVE-2024-0564, ROOT-OS-UBUNTU-2204-CVE-2024-0564 and 2 more.