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Fencer Vulns
high 7.8

CVE-2023-5633 json

Kernel: vmwgfx: reference count issue leads to use-after-free in surface handling

published 2023-10-23 3 y ago modified 2026-11-04 4 d ago also EUVD-2023-57926

cvss
7.8
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 20%
public exploits
0
none known

Summary

The reference count changes made as part of the CVE-2023-33951 and CVE-2023-33952 fixes exposed a use-after-free flaw in the way memory objects were handled when they were being used to store a surface. When running inside a VMware guest with 3D acceleration enabled, a local, unprivileged user could potentially use this flaw to escalate their privileges.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 8 0:4.18.0-513.11.1.el8_9, 0:4.18.0-513.11.1.rt7.313.el8_9
  • Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:4.18.0-477.51.1.el8_8
  • Red Hat Red Hat Enterprise Linux 9 0:5.14.0-362.18.1.el9_3
  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.75.1.el9_2, 0:5.14.0-284.75.1.rt14.360.el9_2
  • linux Debian 12 6.1.76-1
  • linux Debian 14, Debian 13 6.5.8-1

debian advisories DEBIAN-CVE-2023-5633

  • linux-raspi Ubuntu 24.04 LTS 6.7.0-1001.1
  • linux-aws-6.5 Ubuntu 22.04 LTS 6.5.0-1010.10~22.04.1
  • linux-oem-6.1 Ubuntu 22.04 LTS 6.1.0-1035.35
  • linux-oem-6.5 Ubuntu 22.04 LTS 6.5.0-1008.8
  • linux-azure-6.5 Ubuntu 22.04 LTS 6.5.0-1009.9~22.04.1
  • linux-nvidia-6.5 Ubuntu 22.04 LTS 6.5.0-1007.7

ubuntu advisories UBUNTU-CVE-2023-5633

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 5.14.0-362.18.1.el9_3
  • rv RHEL 9 5.14.0-362.18.1.el9_3
  • perf RHEL 9 5.14.0-362.18.1.el9_3
  • rtla RHEL 9 5.14.0-362.18.1.el9_3
  • bpftool RHEL 9 7.2.0-362.18.1.el9_3
  • libperf RHEL 9 5.14.0-362.18.1.el9_3
  • kernel-rt RHEL 9 5.14.0-362.18.1.el9_3
  • kernel-64k RHEL 9 5.14.0-362.18.1.el9_3

red hat advisories RHSA-2024:4823RHSA-2024:4831RHSA-2024:1404RHSA-2024:0461RHSA-2024:0113RHSA-2024:0134

  • kernel-rt Real Time Module 15 SP7 6.4.0-150700.7.19.1
  • kernel-syms-rt Real Time Module 15 SP7 6.4.0-150700.7.19.1
  • kernel-source-rt Real Time Module 15 SP7 6.4.0-150700.7.19.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.15.2
  • kernel-syms-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.15.1
  • kernel-source-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.15.2
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.19.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.19.1

suse advisories SUSE-SU-2025:3725-1SUSE-SU-2025:03633-1SUSE-SU-2025:03601-1SUSE-SU-2023:4734-1SUSE-SU-2023:4732-1SUSE-SU-2023:4730-1

  • kernel AlmaLinux 8 4.18.0-513.11.1.el8_9
  • perf AlmaLinux 8 4.18.0-513.11.1.el8_9
  • bpftool AlmaLinux 8 4.18.0-513.11.1.el8_9
  • kernel-core AlmaLinux 8 4.18.0-513.11.1.el8_9
  • kernel-tools AlmaLinux 8 4.18.0-513.11.1.el8_9
  • python3-perf AlmaLinux 8 4.18.0-513.11.1.el8_9
  • kernel-modules AlmaLinux 8 4.18.0-513.11.1.el8_9
  • kernel-zfcpdump AlmaLinux 8 4.18.0-513.11.1.el8_9

almalinux advisories ALSA-2024:0113

  • kernel-rt Rocky Linux 8 4.18.0-513.11.1.rt7.313.el8_9

rocky linux advisories RLSA-2024:0134

  • kernel CBL-Mariner 2.0 5.15.153.1-1

azure linux advisories AZL-31760

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

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-2023-5633 updated cvss 7.8

kernel: vmwgfx: reference count issue leads to use-after-free in surface handling

  • 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: workaround, no fix available
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-513.11.1.el8_9, kernel-debuginfo-common-aarch64 4.18.0-513.11.1.el8_9, kernel-debuginfo-common-ppc64le 4.18.0-513.11.1.el8_9
    fixed: vendor fix RHSA-2024:0113
  • Red Hat CodeReady Linux Builder (v. 9) libperf 5.14.0-362.18.1.el9_3, kernel-debuginfo-common-s390x 5.14.0-362.18.1.el9_3, kernel-debuginfo-common-x86_64 5.14.0-362.18.1.el9_3, kernel-debuginfo-common-aarch64 5.14.0-362.18.1.el9_3, kernel-debuginfo-common-ppc64le 5.14.0-362.18.1.el9_3
    fixed: vendor fix RHSA-2024:0461
  • Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-debuginfo-common-x86_64 4.18.0-477.51.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.51.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.51.1.el8_8
    fixed: vendor fix RHSA-2024:1404
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.75.1.el9_2
    fixed: vendor fix RHSA-2024:4823
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-362.18.1.el9_3, perf 5.14.0-362.18.1.el9_3, rtla 5.14.0-362.18.1.el9_3, kernel-devel-matched 5.14.0-362.18.1.el9_3, kernel-64k-devel-matched 5.14.0-362.18.1.el9_3, kernel-debug-devel-matched 5.14.0-362.18.1.el9_3, +6 more
    fixed: vendor fix RHSA-2024:0461
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.75.1.el9_2, rtla 5.14.0-284.75.1.el9_2, kernel-devel-matched 5.14.0-284.75.1.el9_2, kernel-64k-devel-matched 5.14.0-284.75.1.el9_2, kernel-debug-devel-matched 5.14.0-284.75.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.75.1.el9_2, +5 more
    fixed: vendor fix RHSA-2024:4823
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-513.11.1.el8_9, kernel 4.18.0-513.11.1.el8_9, bpftool 4.18.0-513.11.1.el8_9, kernel-core 4.18.0-513.11.1.el8_9, kernel-tools 4.18.0-513.11.1.el8_9, python3-perf 4.18.0-513.11.1.el8_9, +15 more
    fixed: vendor fix RHSA-2024:0113
show 10 more
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.2.0-362.18.1.el9_3, kernel 5.14.0-362.18.1.el9_3, kernel-64k 5.14.0-362.18.1.el9_3, kernel-core 5.14.0-362.18.1.el9_3, kernel-tools 5.14.0-362.18.1.el9_3, python3-perf 5.14.0-362.18.1.el9_3, +28 more
    fixed: vendor fix RHSA-2024:0461
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) perf 4.18.0-477.51.1.el8_8, kernel 4.18.0-477.51.1.el8_8, bpftool 4.18.0-477.51.1.el8_8, kernel-core 4.18.0-477.51.1.el8_8, kernel-tools 4.18.0-477.51.1.el8_8, python3-perf 4.18.0-477.51.1.el8_8, +15 more
    fixed: vendor fix RHSA-2024:1404
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.75.1.el9_2, kernel 5.14.0-284.75.1.el9_2, kernel-64k 5.14.0-284.75.1.el9_2, kernel-core 5.14.0-284.75.1.el9_2, kernel-tools 5.14.0-284.75.1.el9_2, python3-perf 5.14.0-284.75.1.el9_2, +28 more
    fixed: vendor fix RHSA-2024:4823
  • Red Hat Enterprise Linux for Real Time (v. 8) kernel-rt 4.18.0-513.11.1.rt7.313.el8_9, kernel-rt-core 4.18.0-513.11.1.rt7.313.el8_9, kernel-rt-modules 4.18.0-513.11.1.rt7.313.el8_9, kernel-rt-debug-core 4.18.0-513.11.1.rt7.313.el8_9, kernel-rt-debug-modules 4.18.0-513.11.1.rt7.313.el8_9, kernel-rt-modules-extra 4.18.0-513.11.1.rt7.313.el8_9, +2 more
    fixed: vendor fix RHSA-2024:0134
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-362.18.1.el9_3, kernel-rt-core 5.14.0-362.18.1.el9_3, kernel-rt-modules 5.14.0-362.18.1.el9_3, kernel-rt-debug-core 5.14.0-362.18.1.el9_3, kernel-rt-modules-core 5.14.0-362.18.1.el9_3, kernel-rt-debug-modules 5.14.0-362.18.1.el9_3, +4 more
    fixed: vendor fix RHSA-2024:0461
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-modules 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-modules-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-modules 5.14.0-284.75.1.rt14.360.el9_2, +4 more
    fixed: vendor fix RHSA-2024:4831
  • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-513.11.1.rt7.313.el8_9, kernel-rt-kvm 4.18.0-513.11.1.rt7.313.el8_9, kernel-rt-core 4.18.0-513.11.1.rt7.313.el8_9, kernel-rt-modules 4.18.0-513.11.1.rt7.313.el8_9, kernel-rt-debug-kvm 4.18.0-513.11.1.rt7.313.el8_9, kernel-rt-debug-core 4.18.0-513.11.1.rt7.313.el8_9, +4 more
    fixed: vendor fix RHSA-2024:0134
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-362.18.1.el9_3, kernel-rt-kvm 5.14.0-362.18.1.el9_3, kernel-rt-core 5.14.0-362.18.1.el9_3, kernel-rt-modules 5.14.0-362.18.1.el9_3, kernel-rt-debug-kvm 5.14.0-362.18.1.el9_3, kernel-rt-debug-core 5.14.0-362.18.1.el9_3, +6 more
    fixed: vendor fix RHSA-2024:0461
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-kvm 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-core 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-modules 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-kvm 5.14.0-284.75.1.rt14.360.el9_2, kernel-rt-debug-core 5.14.0-284.75.1.rt14.360.el9_2, +6 more
    fixed: vendor fix RHSA-2024:4831
  • 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 AppStream EUS (v.9.2) kernel-doc 5.14.0-284.75.1.el9_2
    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 SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7

Classification

Weakness
Technology feeds

References

Sources

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.