← All notices | Source (USN-8913-1) | Text version

QSN-8913-1: libx11 vulnerabilities

October 12, 2026

Summary

Several security issues were fixed in libx11.

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. (CVE-2026-94285)

Affected QuantaStor releases

ReleasePlatformPackageExposureShipped versionFixed versionStatus
6.9.1.001Ubuntu 22.04 LTSlibx11-6Internally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.9.1.001Ubuntu 22.04 LTSlibx11-dataInternally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSlibx11-6Internally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.9.0.464Ubuntu 22.04 LTSlibx11-dataInternally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSlibx11-6Internally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSlibx11-dataInternally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibx11-6Internally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibx11-dataInternally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibx11-6Internally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibx11-dataInternally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibx11-6Internally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibx11-dataInternally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibx11-6Internally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibx11-dataInternally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibx11-6Internally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibx11-dataInternally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibx11-6Internally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibx11-dataInternally-facing2:1.7.5-1ubuntu0.32:1.7.5-1ubuntu0.4Fixed by QuantaStor security update

Internally-facing: only accessible when logged into the QuantaStor console/ssh as the qadmin administrative sudo user; generally lower priority. Externally-facing: part of a service the storage platform presents on the network (or the kernel), so potentially reachable over the network.

CVEs

CVE-2026-94283, CVE-2026-94284, CVE-2026-88806, CVE-2026-94285

References

https://ubuntu.com/security/notices/USN-8913-1

https://nvd.nist.gov/vuln/detail/CVE-2026-94283

https://nvd.nist.gov/vuln/detail/CVE-2026-94284

https://nvd.nist.gov/vuln/detail/CVE-2026-88806

https://nvd.nist.gov/vuln/detail/CVE-2026-94285

Update

Fixes marked Fixed by QuantaStor security update are applied by upgrading QuantaStor with security patches included (Upgrade Manager). Fixed package versions:

PlatformPackageVersion
bioniclibx112:1.6.4-3ubuntu0.4+esm3
Ubuntu 20.04 LTSlibx112:1.6.9-2ubuntu1.6+esm1
Ubuntu 22.04 LTSlibx112:1.7.5-1ubuntu0.4
Ubuntu 24.04 LTSlibx112:1.8.7-1ubuntu0.1
resolutelibx112:1.8.13-1ubuntu0.1
trustylibx112:1.6.2-1ubuntu2.1+esm6
xeniallibx112:1.6.3-1ubuntu2.2+esm5