Description
The XGetImage function in X.org libX11 before 1.6.4 might allow remote X servers to gain privileges via vectors involving image type and geometry, which triggers out-of-bounds read operations.
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 | 2:1.6.4-1 | — |
| Debian 13 | libx11 | 2:1.6.4-1 | — |
| Debian 12 | libx11 | 2:1.6.4-1 | — |
| Debian 7 | libx11 | 2:1.5.0-1+deb7u3 | DLA-684-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libx11 | 2:1.6.4-3ubuntu0.1 | USN-3758-1 |
| Ubuntu 16.04 LTS | libx11 | 2:1.6.3-1ubuntu2.1 | USN-3758-1 |
| Ubuntu 14.04 LTS | libx11 | 2:1.6.2-1ubuntu2.1 | USN-3758-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | libX11 | 1.6.2-8.1 | SUSE-SU-2016:3001-1, 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-2016:3001-1, 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-libX11 | 7.4-5.11.65.1 | SUSE-SU-2016:3054-1 |
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-2016:3001-1, 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-2016:3001-1, 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-libX11 | 7.4-5.11.65.1 | SUSE-SU-2016:3054-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.3 | libx11 | 1.6.3-r3 | — |
| Alpine v3.2 | libx11 | 1.6.3-r1 | — |
Advisories 6
- USN-3758-1 libx11 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-684-1 libx11 - security update Debian Security (DSA / DLA) · Mar 9, 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
- SUSE-SU-2016:3001-1 Security update for libX11 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3054-1 Security update for xorg-x11-libX11 SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 1036945 vdb-entry
- USN-3758-2 vendor-advisory
- GLSA-201704-03 vendor-advisory
- 93363 vdb-entry
- [xorg-announce] 20161004 X.Org security advisory: Protocol handling issues in X Window System client libraries mailing-list
- [oss-security] 20161004 Re: X.Org security advisory: Protocol handling issues in X Window System client libraries mailing-list
- [oss-security] 20161004 X.Org security advisory: Protocol handling issues in X Window System client libraries mailing-list
- USN-3758-1 vendor-advisory
- FEDORA-2016-0df69ab477 vendor-advisory
- https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8ea762f94f4c942d898fdeb590a1630c83235c17