High [CVE-2025-62231] Xorg: xmayland: value overflow in xkbsetcompatmap
This high-severity Red Hat Linux advisory covers CVE-2025-62231 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION, Red Hat Enterprise Linux 7 Extended Lifecycle Support.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where improper bounds checking in the XkbSetCompatMap() function can cause an unsigned short overflow. If an attacker sends specially crafted input data, the value calculation may overflow, leading to memory corruption or a crash.
The Red Hat Product Security team has rated this vulnerability as Moderate for default RHEL 8 and 9, where the X.Org server does not run with root privileges.
For RHEL 7, TigerVNC-as-root, or SSH X11-forwarded environments, the impact is considered High due to the potential for local privilege escalation or remote code execution, as it can be exploited remotely to cause denial of service through crafted keyboard mapping requests.
Successful exploitation could crash the X server but is not likely to lead to code execution. Red Hat severity: Moderate — CVSS 7.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H).
Weakness: CWE-190.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.2 Advanced Update Support; and 12 more.
Is CVE-2025-62231 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2025-62231 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2025-62231?
Upgrade to a fixed release named by Red Hat:
- xorg-x11-server-Xwayland-0:24.1.5-5.el10_0
- xorg-x11-server-Xwayland-0:24.1.5-5.el10_1
- tigervnc-0:1.1.0-25.el6_10.15
- xorg-x11-server-0:1.20.4-33.el7_9
- tigervnc-0:1.8.0-36.el7_9.3
- xorg-x11-server-Xwayland-0:21.1.3-19.el8_10
- xorg-x11-server-0:1.20.11-27.el8_10
- tigervnc-0:1.15.0-8.el8_10
- tigervnc-0:1.9.0-15.el8_2.15
- xorg-x11-server-0:1.20.6-5.el8_2
- tigervnc-0:1.11.0-8.el8_4.14
- xorg-x11-server-0:1.20.10-3.el8_4
38 more fixed releases are listed below.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
- xorg-x11-server-Xwayland-0:24.1.5-5.el10_0
- xorg-x11-server-Xwayland-0:24.1.5-5.el10_1
- tigervnc-0:1.1.0-25.el6_10.15
- xorg-x11-server-0:1.20.4-33.el7_9
- tigervnc-0:1.8.0-36.el7_9.3
- xorg-x11-server-Xwayland-0:21.1.3-19.el8_10
- xorg-x11-server-0:1.20.11-27.el8_10
- tigervnc-0:1.15.0-8.el8_10
- tigervnc-0:1.9.0-15.el8_2.15
- xorg-x11-server-0:1.20.6-5.el8_2
- tigervnc-0:1.11.0-8.el8_4.14
- xorg-x11-server-0:1.20.10-3.el8_4
- tigervnc-0:1.12.0-6.el8_6.15
- xorg-x11-server-0:1.20.11-6.el8_6
- xorg-x11-server-Xwayland-0:21.1.3-2.el8_6.5
- tigervnc-0:1.12.0-15.el8_8.16
- xorg-x11-server-0:1.20.11-17.el8_8
- xorg-x11-server-Xwayland-0:21.1.3-12.el8_8
- xorg-x11-server-0:1.20.11-32.el9_6
- tigervnc-0:1.14.1-9.el9_6
- xorg-x11-server-Xwayland-0:23.2.7-5.el9_6
- tigervnc-0:1.15.0-6.el9_7
- xorg-x11-server-Xwayland-0:23.2.7-5.el9_7
- xorg-x11-server-0:1.20.11-32.el9_7
- tigervnc-0:1.11.0-22.el9_0.16
- xorg-x11-server-0:1.20.11-12.el9_0
- xorg-x11-server-Xwayland-0:21.1.3-4.el9_0
- tigervnc-0:1.12.0-14.el9_2.13
- xorg-x11-server-0:1.20.11-19.el9_2
- xorg-x11-server-Xwayland-0:21.1.3-9.el9_2
- tigervnc-0:1.13.1-8.el9_4.8
- xorg-x11-server-0:1.20.11-27.el9_4
- xorg-x11-server-Xwayland-0:22.1.9-7.el9_4
- RHSA-2025:19435
- RHSA-2025:21035
- RHSA-2025:22667
- RHSA-2025:22040
- RHSA-2025:22096
- RHSA-2025:19432
- RHSA-2025:19434
- RHSA-2025:19909
- RHSA-2025:22077
- RHSA-2025:22729
- RHSA-2025:22167
- RHSA-2025:22753
- RHSA-2025:22041
- RHSA-2025:22427
- RHSA-2026:0035
- RHSA-2025:22164
- RHSA-2025:22426
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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