CVE-2026-64295
kernel: mm: page_ext: add count limit to page_ext_iter_next to prevent invalid PFN access
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 25, 2026
Updated · August 13, 2026
Description
A flaw was found in the Linux kernel's memory management (mm) component, specifically within the page_ext iteration application programming interface (API). When memory is dynamically added to the system (a process known as 'hotplugging'), the API does not properly validate memory page frame numbers (PFNs). This oversight can lead to a null pointer dereference, potentially causing a system crash or denial of service (DoS) if an attacker can trigger memory hotplug operations.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 · NULL Pointer Dereference