Use after free race between mbind() and vma-locked page fault

published 2023-08-29 3 y ago modified 2026-09-11 58 d ago also EUVD-2023-54464

cvss: 7.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits: 0; none known

A use-after-free flaw was found in mm/mempolicy.c in the memory management subsystem in the Linux Kernel. This issue is caused by a race between mbind() and VMA-locked page fault, and may allow a local attacker to crash the system or lead to a kernel information leak.

Patch / fix

fixed in 1 distros 2 links 2

linux linux_kernel 6.4.8

debian azure linux

linux Debian 14, Debian 13 6.4.11-1

debian advisories DEBIAN-CVE-2023-4611

kernel CBL-Mariner 2.0 5.15.135.1-2

azure linux advisories AZL-28546

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

spinics.net/lists/stable-commits/msg310136.html patch
bugzilla.redhat.com/show_bug.cgi?id=2227244 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-4611 updated 2026-11-07 cvss 7.0

kernel: Use after free race between mbind() and VMA-locked page fault

Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-24-228-06 updated 2024-08-13 cvss 6.3

Siemens SINEC NMS

Siemens SINEC NMS <V3.0
affected: fixed in V3.0 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 20 mo ago (2025-02-26)

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.0	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	6.3	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

n/a Kernel
Red Hat Red Hat Enterprise Linux 6
Red Hat Red Hat Enterprise Linux 7
Red Hat Red Hat Enterprise Linux 8
Red Hat Red Hat Enterprise Linux 9
Fedora Fedora

Classification

Weakness

CWE-416 Use After Free

Technology feeds

Linux kernel rss critical rss

References

bugzilla.redhat.com /show_bug.cgi?id=2227244
issue-tracking, patch, third-party-advisory
spinics.net /lists/stable-commits/msg310136.html
mailing-list, patch
access.redhat.com /security/cve/CVE-2023-4611
vdb-entry, third-party-advisory

Sources

CVE List CVE-2023-4611
NVD CVE-2023-4611

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary