CVE-2026-53373

7.8

Linux · Kernel

A memory management flaw exists in the Linux kernel where improper handling of VMA unmapping during mmap_prepare invocations from stacked drivers leads to high security risks.

Executive summary

A local privilege escalation vulnerability in the Linux kernel memory management subsystem could allow local users to achieve high confidentiality, integrity, and availability impacts.

Vulnerability

This is an improper memory management vulnerability involving virtual memory area operations in stacked drivers, requiring low local privileges to exploit.

Business impact

A successful exploit of this vulnerability could grant an attacker complete control over the affected host system, leading to total data compromise, unauthorized access, and system downtime. The CVSS score of 7.8 reflects the high severity of potential impacts when local execution is achieved.

Remediation

Immediate Action: Update the Linux kernel to version 7.0.9 or later, or apply the official fix commits provided by the vendor.

Proactive Monitoring: Monitor system logs for kernel warnings, unexpected segmentation faults, or unauthorized local privilege escalation attempts.

Compensating Controls: Restrict local shell access and apply principle of least privilege principles to user accounts to mitigate potential local exploitation vectors.

Exploitation status

Public Exploit Available: No

Analyst recommendation

System administrators must prioritize patching the Linux kernel across all affected environments. Applying the official vendor updates immediately will eliminate the underlying memory management defect and secure the operating system against potential local attacks.

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