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CVE-2026-23077

kernel: Linux kernel: Privilege escalation via Use-After-Free in mm/vma mremap()

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Severity

Important

Red Hat Product Security

7.8

CVSS 3.1

Review impact separately from score.

Published · February 4, 2026

Updated · October 1, 2026

Description

A flaw was found in the Linux kernel's memory management subsystem (mm/vma). This vulnerability arises from incorrect handling of anonymous Virtual Memory Area (VMA) merges during mremap() operations when a faulted VMA is adjacent to an unfaulted VMA. A local attacker could exploit this Use-After-Free (UAF) condition to potentially escalate privileges on the system.

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 · 7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-825 · Expired Pointer Dereference