TI-2024-00522 Aliases CVE-2024-0564 GHSA-5m9g-m2vj-47r4

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

LOW 30CWE-203Published 2024-01-30 · Updated 2026-11-06

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Partial Red Hat: 4 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-203.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00623 50th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Red Hat	Red Hat Enterprise Linux 6	—	—	No fix listed	CNA
Red Hat	Red Hat Enterprise Linux 7	—	—	No fix listed	CNA
Red Hat	Red Hat Enterprise Linux 7	—	—	No fix listed	CNA
Red Hat	Red Hat Enterprise Linux 8	—	—	No fix listed	CNA
Red Hat	Red Hat Enterprise Linux 8	—	—	No fix listed	CNA
Red Hat	Red Hat Enterprise Linux 9	—	—	No fix listed	CNA
Red Hat	Red Hat Enterprise Linux 9	—	—	No fix listed	CNA

Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	4.4.0-96.119 – 5.15.0-58	Vulnerable	Linux
cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*	8.0	Vulnerable	Red Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:::::::*	9.0	Vulnerable	Red Hat

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.4.0-96.119 – 5.15.0-58 Vulnerable ·Linux
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2024-0564
2026-10-03 Alias added: GHSA-5m9g-m2vj-47r4
2026-11-05 EPSS moved to the 50th–90th percentile

References

Exploit 1

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

Advisory 1

https://access.redhat.com/security/cve/CVE-2024-0564

Other 3

TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
TI-2018-10530 Code injection in [UNKNOWN] RichFaces KEVCVSS 3.1CRITICAL 9.8
TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
TI-2025-23530 Sudo before 1.9.17p1 allows local users to obtain root access because /etc/nsswitch.conf… KEVCVSS 3.1CRITICAL 9.3
TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0

See all 1955 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences