Description
A vulnerability was found in libX11 due to an infinite loop within the PutSubImage() function. This flaw allows a local user to consume all available system resources and cause a denial of service condition.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | libXpm | < 3.5.17 | 3.5.17 |
| 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 | — | — |
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 | libx11 | 2:1.8.7-1 | — |
| Debian 13 | libx11 | 2:1.8.7-1 | — |
| Debian 12 | libx11 | 2:1.8.4-2+deb12u2 | DSA-5517-1 |
| Debian 11 | libx11 | 2:1.7.2-1+deb11u2 | DSA-5517-1 |
| Debian 10 | libx11 | 2:1.6.7-1+deb10u4 | DLA-3602-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | motif | No fix yet | — |
| Ubuntu 26.04 LTS | motif | No fix yet | — |
| Ubuntu 25.10 | motif | No fix yet | — |
| Ubuntu 24.04 LTS | libx11 | 2:1.8.6-1ubuntu1 | — |
| Ubuntu 24.04 LTS | libxpm | 1:3.5.12-1.1ubuntu1 | — |
| Ubuntu 24.04 LTS | motif | No fix yet | — |
| Ubuntu 22.04 LTS | libx11 | 2:1.7.5-1ubuntu0.3 | USN-6407-1 |
| Ubuntu 22.04 LTS | libxpm | 1:3.5.12-1ubuntu0.22.04.2 | USN-6408-1 |
| Ubuntu 22.04 LTS | motif | No fix yet | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libx11 | 2:1.6.9-2ubuntu1.6 | USN-6407-1 |
| Ubuntu 20.04 LTS | libxpm | 1:3.5.12-1ubuntu0.20.04.2 | USN-6408-1 |
| Ubuntu 20.04 LTS | motif | No fix yet | — |
| Ubuntu 18.04 LTS | motif | No fix yet | — |
| Ubuntu 16.04 LTS | motif | No fix yet | — |
| Ubuntu 14.04 LTS | motif | No fix yet | — |
| Ubuntu Pro 18.04 LTS | libx11 | 2:1.6.4-3ubuntu0.4+esm2 | USN-6407-2 |
| Ubuntu Pro 18.04 LTS | libxpm | 1:3.5.12-1ubuntu0.18.04.2+esm1 | USN-6408-2 |
| Ubuntu Pro 16.04 LTS | libx11 | 2:1.6.3-1ubuntu2.2+esm4 | USN-6407-2 |
| Ubuntu Pro 16.04 LTS | libxpm | 1:3.5.11-1ubuntu0.16.04.1+esm2 | USN-6408-2 |
| Ubuntu Pro 14.04 LTS | libx11 | 2:1.6.2-1ubuntu2.1+esm5 | USN-6407-2 |
| Ubuntu Pro 14.04 LTS | libxpm | 1:3.5.10-1ubuntu0.1+esm2 | USN-6408-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | libX11 +3 | 1.7.0-9.el9 | RHSA-2024:2145 |
| RHEL 8 | libX11 +3 | 1.6.8-8.el8 | RHSA-2024:2973 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | libX11 +3 | 1.7.0-9.el9 | ALSA-2024:2145 |
| AlmaLinux 8 | libX11 +3 | 1.6.8-8.el8 | ALSA-2024:2973 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | libX11 | 1.7.0-9.el9 | RLSA-2024:2145 |
| Rocky Linux 8 | libX11 | 1.6.8-8.el8 | RLSA-2024:2973 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | libX11 | 1.6.5-150000.3.33.1 | SUSE-SU-2023:3963-1 |
| SLES 15 SP4 | libX11 | 1.6.5-150000.3.33.1 | SUSE-SU-2023:3963-1 |
| SLES 12 SP5 | libX11 | 1.6.2-12.33.1 | SUSE-SU-2023:3989-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | libX11 | 1.6.2-12.33.1 | SUSE-SU-2023:3989-1 |
| SLE Micro 5.5 | libX11 | 1.6.5-150000.3.33.1 | SUSE-SU-2024:2453-1, SUSE-SU-2023:3963-1 |
| SLE Micro 5.4 | libX11 | 1.6.5-150000.3.33.1 | SUSE-SU-2023:3963-1 |
| SLE Micro 5.3 | libX11 | 1.6.5-150000.3.33.1 | SUSE-SU-2023:3963-1 |
| SLE Micro 5.2 | libX11 | 1.6.5-150000.3.33.1 | SUSE-SU-2023:3963-1 |
| SUSE Manager Server 4.2 | libX11 | 1.6.5-150000.3.33.1 | SUSE-SU-2023:3963-1 |
| SUSE Manager Proxy 4.2 | libX11 | 1.6.5-150000.3.33.1 | SUSE-SU-2023:3963-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.5 | libX11 | 1.6.5-150000.3.33.1 | SUSE-SU-2023:3963-1 |
| openSUSE Leap 15.4 | libX11 | 1.6.5-150000.3.33.1 | SUSE-SU-2023:3963-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libx11 | 1.8.7-r0 | — |
| Alpine v3.23 | libx11 | 1.8.7-r0 | — |
| Alpine v3.22 | libx11 | 1.8.7-r0 | — |
| Alpine v3.21 | libx11 | 1.8.7-r0 | — |
| Alpine v3.20 | libx11 | 1.8.7-r0 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libx11 | 1.8.7-r0 | — |
| Alpine v3.18 | libx11 | 1.8.7-r0 | — |
| Alpine v3.17 | libx11 | 1.8.7-r0 | — |
| Alpine v3.16 | libx11 | 1.8.7-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libX11 +3 | 1.7.2-3.amzn2023.0.4 | ALAS2023-2023-383 |
| Amazon Linux 2023 | libXpm +1 | 3.5.15-2.amzn2023.0.3 | ALAS2023-2023-382 |
| Amazon Linux 2 | libX11 +2 | 1.6.7-3.amzn2.0.5 | ALAS2-2023-2356 |
| Amazon Linux 2 | libXpm +1 | 3.5.12-9.amzn2.0.3 | ALAS2-2024-2389 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | libX11 | 1.8.7-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | libX11 +3 | 1.7.0-9.el9 | ELSA-2024-2145 |
| Oracle Linux 8 | libX11 +3 | 1.6.8-8.el8 | ELSA-2024-2973 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
jfrog/jfrog-CVE-2023-43786-libX11_DoS ★ 0 · Jan 16, 2024
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 24
- ALSA-2024:2145 Moderate: libX11 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:2973 Moderate: libX11 security update AlmaLinux Security Advisories · Oct 29, 2026
- USN-6408-2 libxpm vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-6407-2 libx11 vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- WID-SEC-2024-1226 Red Hat OpenShift: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 11, 2026
- USN-6407-1 libx11 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-6408-1 libxpm vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- RHSA-2024:2973 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:2145 Red Hat Security Advisory: libX11 security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- DSA-5517-1 libx11 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3602-1 libx11 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2023:3989-1 Security update for libX11 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3963-1 Security update for libX11 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2453-1 Security update for libX11 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-2544 X.Org X11: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 7, 2025
- RLSA-2024:2145 Moderate: libX11 security update Rocky Linux Security Advisories · May 7, 2025
- RLSA-2024:2973 Moderate: libX11 security update Rocky Linux Security Advisories · May 7, 2025
- WID-SEC-2024-1248 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 21, 2024
- ELSA-2024-2973 Moderate: libX11 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 23, 2024
- ELSA-2024-2145 Moderate: libX11 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 2, 2024
- ALAS2-2024-2389 Moderate: libXpm security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 9, 2024
- ALAS2-2023-2356 Moderate: libX11 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 4, 2023
- ALAS2023-2023-382 Moderate: libXpm security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 24, 2023
- ALAS2023-2023-383 Moderate: libX11 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 24, 2023
References
- RHSA-2024:2145 vendor-advisory
- RHSA-2024:2973 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2023-43786 vdb-entry
- RHBZ#2242253 issue-tracking