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CVE-2025-26595

Public on 2025-02-25
Modified on 2025-02-28
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.

Severity
Medium
See what this means
CVSS v3 Base Score
4.5
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Core xorg-x11-server 2025-03-08 23:17 ALAS2-2025-2791
Amazon Linux 2023 xorg-x11-server 2025-03-06 23:13 ALAS2023-2025-892
Amazon Linux 2023 xorg-x11-server-Xwayland 2025-03-06 23:13 ALAS2023-2025-891
Amazon Linux 2023 xorg-x11-server-Xwayland 2025-03-13 04:48 ALAS2023-2025-895

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.5 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
NVD CVSSv3 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Red Hat: CVE-2025-26595 Mitre: CVE-2025-26595 FAQs regarding Amazon Linux ALAS/CVE Severity