# 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.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 30 Jan 2024
- **Updated:** 21 Nov 2025
- **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, ROOT-OS-UBUNTU-2404-CVE-2024-0564, UBUNTU-CVE-2024-0564

## 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 (Observable Discrepancy)

## Which versions are affected by CVE-2024-0564?

It affects 2 products.


Products: 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

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-0564 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2024-0564 in the wild and no public exploit code.

Affected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-0564/ (Markdown: https://insights.sbomify.com/CVE-2024-0564/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-0564
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-0564
- OSV: https://osv.dev/vulnerability/CVE-2024-0564

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-0564/
Summaries are generated and may contain mistakes; the official description above is the record.