CVE-2026-34000

medium

Published 2026-05-19 · Modified 2026-05-28

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CVSS v3

6.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

CVSS v4 NEW

—

not yet in upstream

VIR risk

6.1

Description

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.

Predictions

Exploit likelihood

61%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

OS	Version	Status	Fixed in
rhel	9	fixed
sles		affected
rhel	6.0	affected
rhel	7.0	affected
rhel	8.0	affected
rhel	9.0	affected
rhel	10.0	affected
debian	bookworm	fixed	`2:21.1.7-3+deb12u12`
debian	bullseye	affected
debian	forky	fixed	`2:21.1.22-1`
debian	sid	fixed	`2:21.1.22-1`
debian	trixie	fixed	`2:21.1.16-1.3+deb13u2`

Application impact

Vendor	Product	Versions	Fixed
x.org	x_server	`-`

References

CWEs

CWE-125

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.