medium 5.5

CVE-2023-4133 json

Kernel: cxgb4: use-after-free in ch_flower_stats_cb()

published 2023-08-03 3 y ago modified 2026-11-07 45 h ago also EUVD-2023-54015

cvss: 5.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits: 0; none known

A use-after-free vulnerability was found in the cxgb4 driver in the Linux kernel. The bug occurs when the cxgb4 device is detaching due to a possible rearming of the flower_stats_timer from the work queue. This flaw allows a local user to crash the system, causing a denial of service condition.

Patch / fix

fixed in 2 distros 6

Red Hat Red Hat Enterprise Linux 8 0:4.18.0-553.el8_10, 0:4.18.0-553.rt7.342.el8_10
Red Hat Red Hat Enterprise Linux 9 0:5.14.0-427.13.1.el9_4

debian ubuntu red hat suse almalinux rocky linux

linux Debian 14, Debian 13 6.3.7-1

debian advisories DEBIAN-CVE-2023-4133

linux-aws-6.2 Ubuntu 22.04 LTS 6.2.0-1007.7~22.04.1
linux-nvidia-6.2 Ubuntu 22.04 LTS 6.2.0-1009.9

ubuntu advisories UBUNTU-CVE-2023-4133

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

kernel RHEL 9 5.14.0-427.13.1.el9_4
rv RHEL 9 5.14.0-427.13.1.el9_4
perf RHEL 9 5.14.0-427.13.1.el9_4
rtla RHEL 9 5.14.0-427.13.1.el9_4
bpftool RHEL 9 7.3.0-427.13.1.el9_4
libperf RHEL 9 5.14.0-427.13.1.el9_4
kernel-rt RHEL 9 5.14.0-427.13.1.el9_4
kernel-64k RHEL 9 5.14.0-427.13.1.el9_4

red hat advisories RHSA-2024:2394 RHSA-2024:2950 RHSA-2024:3138

kernel-rt SLE Micro 5.5, Real Time Module 15 SP5, openSUSE Leap 15.5 5.14.21-150500.13.18.1
kernel-syms-rt Real Time Module 15 SP5, openSUSE Leap 15.5 5.14.21-150500.13.18.1
kernel-rt_debug Real Time Module 15 SP5, openSUSE Leap 15.5 5.14.21-150500.13.18.1
kernel-source-rt Real Time Module 15 SP5, openSUSE Leap 15.5 5.14.21-150500.13.18.1
dtb-aarch64 openSUSE Leap 15.5 5.14.21-150500.55.28.1
kernel-64kb SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.28.1
kernel-syms SLE Module for Development Tools 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.28.1
kernel-obs-qa openSUSE Leap 15.5 5.14.21-150500.55.28.1

suse advisories SUSE-SU-2023:3988-1 SUSE-SU-2023:3971-1 SUSE-SU-2023:3969-1 SUSE-SU-2023:3964-1 SUSE-SU-2023:3785-1 SUSE-SU-2023:3599-1

kernel-rt AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-kvm AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-core AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-modules AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-debug-kvm AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-debug-core AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-debug-modules AlmaLinux 8 4.18.0-553.rt7.342.el8_10
kernel-rt-modules-extra AlmaLinux 8 4.18.0-553.rt7.342.el8_10

almalinux advisories ALSA-2024:2950 ALSA-2024:3138 ALSA-2024:2394

kernel Rocky Linux 8 4.18.0-553.123.1.el8_10.cloud.0.1
kernel-rt Rocky Linux 8 4.18.0-553.rt7.342.el8_10
kernel Rocky Linux 8 4.18.0-553.el8_10

rocky linux advisories RXSA-2024:3138 RLSA-2024:2950 RLSA-2024:3138

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-2023-4133 updated 2026-11-07 cvss 5.5

kernel: cxgb4: use-after-free in ch_flower_stats_cb()

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
affected: no fix planned “Out of support scope”
Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
affected: no fix available
Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-427.13.1.el9_4, perf 5.14.0-427.13.1.el9_4, rtla 5.14.0-427.13.1.el9_4, kernel-devel-matched 5.14.0-427.13.1.el9_4, kernel-64k-devel-matched 5.14.0-427.13.1.el9_4, kernel-debug-devel-matched 5.14.0-427.13.1.el9_4, +6 more
fixed: vendor fix RHSA-2024:2394
Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.el8_10, kernel 4.18.0-553.el8_10, bpftool 4.18.0-553.el8_10, kernel-core 4.18.0-553.el8_10, kernel-tools 4.18.0-553.el8_10, python3-perf 4.18.0-553.el8_10, +15 more
fixed: vendor fix RHSA-2024:3138
Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.13.1.el9_4, kernel 5.14.0-427.13.1.el9_4, kernel-64k 5.14.0-427.13.1.el9_4, kernel-core 5.14.0-427.13.1.el9_4, kernel-tools 5.14.0-427.13.1.el9_4, python3-perf 5.14.0-427.13.1.el9_4, +28 more
fixed: vendor fix RHSA-2024:2394
Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.el8_10
fixed: vendor fix RHSA-2024:3138
Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.13.1.el9_4
fixed: vendor fix RHSA-2024:2394
Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.rt7.342.el8_10, kernel-rt-kvm 4.18.0-553.rt7.342.el8_10, kernel-rt-core 4.18.0-553.rt7.342.el8_10, kernel-rt-modules 4.18.0-553.rt7.342.el8_10, kernel-rt-debug-kvm 4.18.0-553.rt7.342.el8_10, kernel-rt-debug-core 4.18.0-553.rt7.342.el8_10, +4 more
fixed: vendor fix RHSA-2024:2950

show 3 more

Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.13.1.el9_4, kernel-rt-kvm 5.14.0-427.13.1.el9_4, kernel-rt-core 5.14.0-427.13.1.el9_4, kernel-rt-modules 5.14.0-427.13.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.13.1.el9_4, kernel-rt-debug-core 5.14.0-427.13.1.el9_4, +6 more
fixed: vendor fix RHSA-2024:2394
Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.rt7.342.el8_10, kernel-rt-core 4.18.0-553.rt7.342.el8_10, kernel-rt-modules 4.18.0-553.rt7.342.el8_10, kernel-rt-debug-core 4.18.0-553.rt7.342.el8_10, kernel-rt-debug-modules 4.18.0-553.rt7.342.el8_10, kernel-rt-modules-extra 4.18.0-553.rt7.342.el8_10, +2 more
fixed: vendor fix RHSA-2024:2950
Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.13.1.el9_4, kernel-rt-core 5.14.0-427.13.1.el9_4, kernel-rt-modules 5.14.0-427.13.1.el9_4, kernel-rt-debug-core 5.14.0-427.13.1.el9_4, kernel-rt-modules-core 5.14.0-427.13.1.el9_4, kernel-rt-debug-modules 5.14.0-427.13.1.el9_4, +4 more
fixed: vendor fix RHSA-2024:2394

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 SSVC

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

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

Red Hat Red Hat Enterprise Linux 8
Red Hat Red Hat Enterprise Linux 9
Red Hat Red Hat Enterprise Linux 6
Red Hat Red Hat Enterprise Linux 7

Classification

Weakness

CWE-416 Use After Free

Technology feeds

Linux kernel rss critical rss

References

access.redhat.com /errata/RHSA-2024:2394
vendor-advisory
access.redhat.com /errata/RHSA-2024:2950
vendor-advisory
access.redhat.com /errata/RHSA-2024:3138
vendor-advisory
access.redhat.com /security/cve/CVE-2023-4133
vdb-entry, vendor-advisory
bugzilla.redhat.com /show_bug.cgi?id=2221702
issue-tracking

Sources

CVE List CVE-2023-4133
NVD CVE-2023-4133

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