Description
Integer overflow in X.org libXfixes before 5.0.3 on 32-bit platforms might allow remote X servers to gain privileges via a length value of INT_MAX, which triggers the client to stop reading data and get out of sync.
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 | libxfixes | 1:5.0.3-1 | — |
| Debian 13 | libxfixes | 1:5.0.3-1 | — |
| Debian 12 | libxfixes | 1:5.0.3-1 | — |
| Debian 7 | libxfixes | 1:5.0-4+deb7u2 | DLA-654-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libxfixes | 1:5.0.3-1 | — |
| Ubuntu 18.04 LTS | libxfixes | 1:5.0.3-1 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | libxfixes | 1:5.0.1-2ubuntu0.1~esm1 | USN-5437-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | libX11 | 1.6.2-8.1 | SUSE-SU-2016:2828-1 |
| SLES 12 SP2 | libXfixes | 5.0.1-7.1 | SUSE-SU-2016:2828-1 |
| SLES 12 SP2 | libXi | 1.7.4-14.1 | SUSE-SU-2016:2828-1 |
| SLES 12 SP2 | libXrender | 0.9.8-7.1 | SUSE-SU-2016:2828-1 |
| SLES 12 SP2 | libXtst | 1.2.2-7.1 | SUSE-SU-2016:2828-1 |
| SLES 12 SP2 | libXv | 1.0.10-7.1 | SUSE-SU-2016:2828-1 |
| SLES 12 SP2 | libXvMC | 1.0.8-7.1 | SUSE-SU-2016:2828-1 |
| SLES 12 SP1 | libX11 | 1.6.2-6.2 | SUSE-SU-2016:2505-1 |
| SLES 12 SP1 | libXfixes | 5.0.1-5.2 | SUSE-SU-2016:2505-1 |
| SLES 12 SP1 | libXi | 1.7.4-12.2 | SUSE-SU-2016:2505-1 |
| SLES 12 SP1 | libXrandr | 1.4.2-5.2 | SUSE-SU-2016:2505-1 |
| SLES 12 SP1 | libXrender | 0.9.8-5.2 | SUSE-SU-2016:2505-1 |
| SLES 12 SP1 | libXtst | 1.2.2-5.2 | SUSE-SU-2016:2505-1 |
| SLES 12 SP1 | libXv | 1.0.10-5.2 | SUSE-SU-2016:2505-1 |
| SLES 12 SP1 | libXvMC | 1.0.8-5.2 | SUSE-SU-2016:2505-1 |
| SLES 11 SP4 | xorg-x11-libXfixes | 7.4-1.20.1 | SUSE-SU-2016:3172-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | libX11 | 1.6.2-8.1 | SUSE-SU-2016:2828-1 |
| SLES for SAP 12 SP2 | libXfixes | 5.0.1-7.1 | SUSE-SU-2016:2828-1 |
| SLES for SAP 12 SP2 | libXi | 1.7.4-14.1 | SUSE-SU-2016:2828-1 |
| SLES for SAP 12 SP2 | libXrender | 0.9.8-7.1 | SUSE-SU-2016:2828-1 |
| SLES for SAP 12 SP2 | libXtst | 1.2.2-7.1 | SUSE-SU-2016:2828-1 |
| SLES for SAP 12 SP2 | libXv | 1.0.10-7.1 | SUSE-SU-2016:2828-1 |
| SLES for SAP 12 SP2 | libXvMC | 1.0.8-7.1 | SUSE-SU-2016:2828-1 |
| SLES for SAP 12 SP1 | libX11 | 1.6.2-6.2 | SUSE-SU-2016:2505-1 |
| SLES for SAP 12 SP1 | libXfixes | 5.0.1-5.2 | SUSE-SU-2016:2505-1 |
| SLES for SAP 12 SP1 | libXi | 1.7.4-12.2 | SUSE-SU-2016:2505-1 |
| SLES for SAP 12 SP1 | libXrandr | 1.4.2-5.2 | SUSE-SU-2016:2505-1 |
| SLES for SAP 12 SP1 | libXrender | 0.9.8-5.2 | SUSE-SU-2016:2505-1 |
| SLES for SAP 12 SP1 | libXtst | 1.2.2-5.2 | SUSE-SU-2016:2505-1 |
| SLES for SAP 12 SP1 | libXv | 1.0.10-5.2 | SUSE-SU-2016:2505-1 |
| SLES for SAP 12 SP1 | libXvMC | 1.0.8-5.2 | SUSE-SU-2016:2505-1 |
| SLES for SAP 11 SP4 | xorg-x11-libXfixes | 7.4-1.20.1 | SUSE-SU-2016:3172-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.3 | libxfixes | 5.0.1-r2 | — |
| Alpine v3.2 | libxfixes | 5.0.1-r1 | — |
Advisories 5
- USN-5437-1 libxfixes vulnerability Ubuntu Security Notices (USN) · Jun 25, 2026
- DLA-654-1 libxfixes - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:3172-1 Security update for xorg-x11-libXfixes SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2505-1 Security update for X Window System client libraries SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2828-1 Security update for X Window System client libraries SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 1036945 vdb-entry
- 93361 vdb-entry
- GLSA-201704-03 vendor-advisory
- [xorg-announce] 20161004 X.Org security advisory: Protocol handling issues in X Window System client libraries mailing-list
- FEDORA-2016-72d7f05b90 vendor-advisory
- [oss-security] 20161004 Re: X.Org security advisory: Protocol handling issues in X Window System client libraries mailing-list
- FEDORA-2016-ff5a2f4839 vendor-advisory
- [oss-security] 20161004 X.Org security advisory: Protocol handling issues in X Window System client libraries mailing-list
- https://cgit.freedesktop.org/xorg/lib/libXfixes/commit/?id=61c1039ee23a2d1de712843bed3480654d7ef42e