Description
Uninitialized data in endianness conversion in the XEvent handling of the X.Org X Server before 2017-06-19 allowed authenticated malicious users to access potentially privileged data from the X server.
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 | 2:1.19.3-2 | — |
| Debian 13 | xorg-server | 2:1.19.3-2 | — |
| Debian 12 | xorg-server | 2:1.19.3-2 | — |
| Debian 9 | xorg-server | 2:1.19.2-1+deb9u1 | DSA-3905-1 |
| Debian 8 | xorg-server | 2:1.16.4-1+deb8u1 | DSA-3905-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | xorg-server | 2:1.12.4-6+deb7u7 | DLA-1026-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | xorg-server | 2:1.18.4-0ubuntu0.3 | USN-3362-1 |
| Ubuntu 16.04 LTS | xorg-server-hwe-16.04 | 2:1.18.4-1ubuntu6.1~16.04.2 | USN-3362-1 |
| Ubuntu 14.04 LTS | xorg-server | 2:1.15.1-0ubuntu2.9 | USN-3362-1 |
| Ubuntu 14.04 LTS | xorg-server-lts-xenial | 2:1.18.3-1ubuntu2.3~trusty2 | USN-3362-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | xorg-x11-server | 7.6_1.18.3-74.2 | SUSE-SU-2017:1860-1 |
| SLES 12 SP1 | xorg-x11-server | 7.6_1.15.2-53.3.1 | SUSE-SU-2017:1859-1 |
| SLES 12 | xorg-x11-server | 7.6_1.15.2-30.22.1 | SUSE-SU-2017:1861-1 |
| SLES 11 SP4 | xorg-x11-server | 7.4-27.121.2 | SUSE-SU-2017:1850-1 |
| SLES 11 SP3 | xorg-x11-server | 7.4-27.121.2 | SUSE-SU-2017:1850-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | xorg-x11-server | 7.6_1.18.3-74.2 | SUSE-SU-2017:1860-1 |
| SLES for SAP 12 SP1 | xorg-x11-server | 7.6_1.15.2-53.3.1 | SUSE-SU-2017:1859-1 |
| SLES for SAP 12 | xorg-x11-server | 7.6_1.15.2-30.22.1 | SUSE-SU-2017:1861-1 |
| SLES for SAP 11 SP4 | xorg-x11-server | 7.4-27.121.2 | SUSE-SU-2017:1850-1 |
| SUSE OpenStack Cloud 6 | xorg-x11-server | 7.6_1.15.2-53.3.1 | SUSE-SU-2017:1859-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | xorg-x11-server | 7.4-27.121.2 | SUSE-SU-2017:1850-1 |
Advisories 7
- USN-3362-1 xorg-server, xorg-server-hwe-16.04, xorg-server-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3905-1 xorg-server - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1026-1 xorg-server - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:1861-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1850-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1860-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1859-1 Security update for xorg-x11-server SUSE / openSUSE Security Updates · Feb 4, 2026