An out-of-bounds read in libXi's XI2 XIQueryDevice reply parsing in libXi before 1.8.4 can be used by a malicious X server to crash an attached X… (CVE-2026-93544)
Description
An out-of-bounds read vulnerability exists in libXi's XI2 XIQueryDevice reply parsing in versions before 1.8.4. A malicious X server can exploit this flaw to crash an attached X client, causing a denial of service condition. The vulnerability has a medium severity rating with a CVSS score of 6.5.
CVSS v3.1
Score 6.5medium
Affected software
pkg:deb/ubuntu/libxi?arch=source&distro=esm-infra/xenialpkg:deb/ubuntu/libxi?arch=source&distro=bionicpkg:deb/ubuntu/libxi?arch=source&distro=focalpkg:deb/ubuntu/libxi?arch=source&distro=jammypkg:deb/ubuntu/libxi?arch=source&distro=noblepkg:deb/ubuntu/libxi?arch=source&distro=stonkingpkg:deb/ubuntu/libxi?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-93544 describes an out-of-bounds read in the XI2 XIQueryDevice reply parsing functionality of libXi versions prior to 1.8.4. This flaw allows a malicious X server to send crafted replies that cause the libXi client to read memory outside the intended bounds, resulting in a crash of the X client application. The vulnerability impacts availability but does not affect confidentiality or integrity.
Potential Impact
Exploitation of this vulnerability results in denial of service by crashing the X client attached to a malicious X server. There is no indication of confidentiality or integrity impact. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade libXi to version 1.8.4 or later where this vulnerability is fixed. Since no vendor advisory or patch links were provided, verify the availability of official patches from the libXi maintainers or your Linux distribution vendor. Until patched, avoid connecting to untrusted or malicious X servers.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-93544
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f5242cdf04f656658587
Added to database: 10/17/2026, 22:22:28 UTC
Last enriched: 10/17/2026, 23:06:09 UTC
Last updated: 10/17/2026, 23:06:09 UTC
Views: 3
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