Packages
- libx11 - X11 client-side library
Details
Adam Bedard discovered that libx11 incorrectly handled certain XKB keyboard
map replies. If a user were tricked into connecting to a malicious X
server, a remote attacker could possibly use this issue to cause libx11 to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2026-88806)
It was discovered that libx11 incorrectly handled certain X Input Method
(XIM) messages. If a user were tricked into connecting to a malicious X
server, a remote attacker could possibly use these issues to cause libx11
to crash, resulting in a denial of service. (CVE-2026-94283,
CVE-2026-94284)
It was discovered that libx11 incorrectly handled converting certain
multibyte text. An attacker could possibly use this issue to cause libx11
to crash, resulting in a denial of service. (
Adam Bedard discovered that libx11 incorrectly handled certain XKB keyboard
map replies. If a user were tricked into connecting to a malicious X
server, a remote attacker could possibly use this issue to cause libx11 to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2026-88806)
It was discovered that libx11 incorrectly handled certain X Input Method
(XIM) messages. If a user were tricked into connecting to a malicious X
server, a remote attacker could possibly use these issues to cause libx11
to crash, resulting in a denial of service. (CVE-2026-94283,
CVE-2026-94284)
It was discovered that libx11 incorrectly handled converting certain
multibyte text. An attacker could possibly use this issue to cause libx11
to crash, resulting in a denial of service. (CVE-2026-94285)
Update instructions
After a standard system update you need to reboot your computer to make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 26.04 LTS resolute | libx11-6 – 2:1.8.13-1ubuntu0.1 | ||
| 24.04 LTS noble | libx11-6 – 2:1.8.7-1ubuntu0.1 | ||
| 22.04 LTS jammy | libx11-6 – 2:1.7.5-1ubuntu0.4 | ||
| 20.04 LTS focal | libx11-6 – 2:1.6.9-2ubuntu1.6+esm1 | ||
| 18.04 LTS bionic | libx11-6 – 2:1.6.4-3ubuntu0.4+esm3 | ||
| 16.04 LTS xenial | libx11-6 – 2:1.6.3-1ubuntu2.2+esm5 | ||
| 14.04 LTS trusty | libx11-6 – 2:1.6.2-1ubuntu2.1+esm6 | ||
Reduce your security exposure
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