CVE-2025-26595

Xorg: xwayland: buffer overflow in xkbvmodmasktext()

State: Published
Severity: 7.8 High
Published: Feb 25, 2025
Updated: Jun 29, 2026
Reserved: Feb 12, 2025

Description

A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to check the bounds of the buffer and would copy the data regardless of the size.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	redhat

Weaknesses

CWE-121 Stack-based Buffer Overflow

Affected Products

Product	Versions
xserver	before 21.1.16Affected 22.0.0 to before 24.1.6Affected
Red Hat Enterprise Linux 10Red Hat	0:24.1.5-3.el10_0 and laterNot affected
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONRed Hat	0:1.1.0-25.el6_10 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.8.0-36.el7_9 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat	0:1.20.4-30.el7_9 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:1.13.1-15.el8_10 and laterNot affected
Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat	0:1.9.0-15.el8_2.13 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:1.11.0-8.el8_4.12 and laterNot affected
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRed Hat	0:1.11.0-8.el8_4.12 and laterNot affected
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRed Hat	0:1.11.0-8.el8_4.12 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat	0:1.12.0-6.el8_6.13 and laterNot affected
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRed Hat	0:1.12.0-6.el8_6.13 and laterNot affected
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRed Hat	0:1.12.0-6.el8_6.13 and laterNot affected
Red Hat Enterprise Linux 8.8 Extended Update SupportRed Hat	0:1.12.0-15.el8_8.12 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.14.1-1.el9_5.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:1.20.11-28.el9_6 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:23.2.7-3.el9_6 and laterNot affected
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRed Hat	0:1.11.0-22.el9_0.13 and laterNot affected
Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat	0:1.12.0-14.el9_2.10 and laterNot affected
Red Hat Enterprise Linux 9.4 Extended Update SupportRed Hat	0:1.13.1-8.el9_4.5 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
Red Hat Enterprise Linux 8Red Hat
Red Hat Enterprise Linux 8Red Hat

References

RHSA-2025:2500vendor-advisory
RHSA-2025:2502vendor-advisory
RHSA-2025:2861vendor-advisory
RHSA-2025:2862vendor-advisory
RHSA-2025:2865vendor-advisory
RHSA-2025:2866vendor-advisory
RHSA-2025:2873vendor-advisory
RHSA-2025:2874vendor-advisory
RHSA-2025:2875vendor-advisory
RHSA-2025:2879vendor-advisory
RHSA-2025:2880vendor-advisory
RHSA-2025:3976vendor-advisory
RHSA-2025:7163vendor-advisory
RHSA-2025:7165vendor-advisory
RHSA-2025:7458vendor-advisory
https://access.redhat.com/security/cve/CVE-2025-26595vdb-entry
RHBZ#2345257issue-tracking
https://lists.debian.org/debian-lts-announce/2025/02/msg00036.html

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