CVSS 4.0
6.9 mediumCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:NCVE-2026-109904 X.Org Server XRes QueryClientIds Request Size Overflow
Medium (6.9) in x.org. EPSS 0.2% estimated probability of exploitation activity in the next 30 days.
On this page
A buffer overread caused by an integer-overflow in Proc/SProcXResQueryClientIds in X.Org xwayland before 24.1.15 and X Server before 21.1.26 could be used by attackers on authenticated X clients to crash the server or leak out information.
Severity
- EPSS
- 0.2% estimated probability of exploitation activity in the next 30 days; 6th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CWE
- CWE-126 Buffer Over-read
- Published
- Modified
- Assigned by
- suse (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| X.Org xorg-x11-server | before 21.1.26 |
| X.Org xwayland | before 24.1.15 |
Fix and patched versions
- SUSE, openSUSE, Alpaquita: fixed package versions per release
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Debian | 12, 13, 14 | xwayland, xorg-server | no fix listed | DEBIAN-CVE-2026-109904 |
| Ubuntu | 22.04:LTS, 24.04:LTS, 26.04:LTS and 1 more | xwayland, xorg-server | no fix listed | UBUNTU-CVE-2026-109904 |
| Ubuntu | Pro:14.04:LTS, Pro:20.04:LTS | xorg-server | no fix listed | UBUNTU-CVE-2026-109904 |
| Ubuntu | Pro:16.04:LTS | xorg-server, xorg-server-hwe-16.04 | no fix listed | UBUNTU-CVE-2026-109904 |
| Ubuntu | Pro:18.04:LTS | xorg-server, xorg-server-hwe-18.04 | no fix listed | UBUNTU-CVE-2026-109904 |
| SUSE | Linux Enterprise High Performance Computing 15 SP4-ESPOS, Linux Enterprise High Performance Computing 15 SP4-LTSS, Linux Enterprise Server 15 SP4-LTSS and 1 more | xorg-x11-server | 1.20.3-150400.38.80.1 | SUSE-SU-2026:5180-1 |
| SUSE | Linux Enterprise Server 12 SP5-LTSS, Linux Enterprise Server LTSS Extended Security 12 SP5 | xorg-x11-server | 1.19.6-10.117.1 | SUSE-SU-2026:5178-1 |
| openSUSE | Tumbleweed | xorg-x11-server | 21.1.25-2.1 | openSUSE-SU-2026:12534-1 |
| openSUSE | Tumbleweed | xwayland | 24.1.14-2.1 | openSUSE-SU-2026:12535-1 |
| Alpaquita | 23, 25, stream | xorg-server | 21.1.26-r0 | BELL-CVE-2026-109904 |
From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; SUSE security data, CC BY 4.0; BellSoft's OSV database, MIT. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu · SUSE · openSUSE · Alpaquita.