Description
A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in Xvfb with a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode). If the pointer is warped from a screen 1 to a screen 0, a use-after-free issue may be triggered during shutdown or reset of the Xvfb server, allowing for possible escalation of privileges or denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | xorg-server | No fix yet | — |
| Debian 13 | xorg-server | No fix yet | — |
| Debian 12 | xorg-server | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | xorg-server | No fix yet | — |
| Ubuntu 26.04 LTS | xorg-server | No fix yet | — |
| Ubuntu 25.10 | xorg-server | No fix yet | — |
| Ubuntu 24.04 LTS | xorg-server | No fix yet | — |
| Ubuntu 22.04 LTS | xorg-server | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | xorg-server | No fix yet | — |
| Ubuntu Pro 18.04 LTS | xorg-server +1 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | xorg-server +1 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | xorg-server | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | tigervnc +6 | 1.13.1-8.el9 | RHSA-2024:2298 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | tigervnc +6 | 1.13.1-8.el9 | ALSA-2024:2298 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1, SUSE-SU-2023:4272-1 |
| SLES 15 SP5 | xwayland | 22.1.5-150500.7.5.1 | SUSE-SU-2023:4306-1 |
| SLES 15 SP4 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1, SUSE-SU-2023:4292-1 |
| SLES 15 SP4 | xwayland | 21.1.4-150400.3.20.1 | SUSE-SU-2023:4293-1 |
| SLES 15 SP3 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1 |
| SLES 15 SP2 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1 |
| SLES 12 SP5 | xorg-x11-server | 1.19.6-10.56.1 | SUSE-SU-2023:4269-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP3 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1 |
| SLES for SAP 15 SP2 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1 |
| SLES for SAP 12 SP5 | xorg-x11-server | 1.19.6-10.56.1 | SUSE-SU-2023:4269-1 |
| SLE HPC 15 SP3 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1 |
| SLE HPC 15 SP2 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1 |
| SUSE Manager Server 4.2 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1 |
| SUSE Manager Proxy 4.2 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1 |
| SUSE Enterprise Storage 7.1 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | xorg-x11-server | 21.1.9-1.1 | openSUSE-SU-2024:13361-1 |
| openSUSE Tumbleweed | xwayland | 23.2.2-2.1 | openSUSE-SU-2024:13467-1 |
| openSUSE Leap 15.5 | xorg-x11-server | 21.1.4-150500.7.7.1 | SUSE-SU-2023:4272-1 |
| openSUSE Leap 15.5 | xwayland | 22.1.5-150500.7.5.1 | SUSE-SU-2023:4306-1 |
| openSUSE Leap 15.4 | xorg-x11-server | 1.20.3-150200.22.5.79.1 | SUSE-SU-2023:4338-1, SUSE-SU-2023:4292-1 |
| openSUSE Leap 15.4 | xwayland | 21.1.4-150400.3.20.1 | SUSE-SU-2023:4293-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | xorg-server | 21.1.9-r0 | — |
| Alpine v3.23 | xorg-server | 21.1.9-r0 | — |
| Alpine v3.22 | xorg-server | 21.1.9-r0 | — |
| Alpine v3.21 | xorg-server | 21.1.9-r0 | — |
| Alpine v3.20 | xorg-server | 21.1.9-r0 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | xorg-server | 21.1.9-r0 | — |
| Alpine v3.18 | xorg-server | 21.1.9-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | xorg-x11-server-Xdmx +7 | 1.20.14-26.amzn2023.0.2 | ALAS2023-2023-444 |
| Amazon Linux 2 | xorg-x11-server-Xdmx +8 | 1.20.4-22.amzn2.0.2 | ALAS2-2023-2352 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | xorg-x11-server | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | xorg-x11-server | 1.20.10-10 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | tigervnc +6 | 1.13.1-8.el9 | ELSA-2024-2298 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | xorg-server | No fix yet | — |
Advisories 15
- ALSA-2024:2298 Important: tigervnc security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:2298 Red Hat Security Advisory: tigervnc security update Red Hat Security Advisories (RHSA) · Jul 12, 2026
- SUSE-SU-2023:4306-1 Security update for xwayland SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13361-1 xorg-x11-server-21.1.9-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4269-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4338-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4292-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13467-1 xwayland-23.2.2-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4293-1 Security update for xwayland SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4272-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-2749 X.Org X11: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 4, 2025
- WID-SEC-2024-1248 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 21, 2024
- ELSA-2024-2298 Important: tigervnc security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 2, 2024
- ALAS2023-2023-444 Important: xorg-x11-server security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Dec 14, 2023
- ALAS2-2023-2352 Important: xorg-x11-server security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 4, 2023
References
- RHSA-2024:2298 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2023-5574 vdb-entry
- RHBZ#2244735 issue-tracking
- https://lists.x.org/archives/xorg-announce/2023-October/003430.html