Improper control of a resource through its lifetime in Linux kernel - CVE-2026-64244

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Main Vulnerability Database Vulnerabilities #VU139750

Improper control of a resource through its lifetime in Linux kernel - CVE-2026-64244

Published: July 27, 2026


Vulnerability identifier: #VU139750
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64244
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local attacker to cause a denial of service.

The vulnerability exists due to improper state management in add_memory_block() and memory_block_release() when handling failed memory block registration. A local attacker can trigger a failure during memory block registration to cause a denial of service.

This issue can be triggered when __add_memory_block() fails at xa_store() under memory pressure, leading to a kernel WARN_ON on mem->altmap.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

How to mitigate CVE-2026-64244

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13

External References

Related Security Bulletins