CVE-2025-26595
HIGH severity · CVSS 7.8 · CWE-121
7.8CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://access.redhat.com/errata/RHSA-2025:2500Advisory
- https://access.redhat.com/errata/RHSA-2025:2502Advisory
- https://access.redhat.com/errata/RHSA-2025:2861Advisory
- https://access.redhat.com/errata/RHSA-2025:2862Advisory
- https://access.redhat.com/errata/RHSA-2025:2865Advisory
- https://access.redhat.com/errata/RHSA-2025:2866Advisory
- https://access.redhat.com/errata/RHSA-2025:2873Advisory
- https://access.redhat.com/errata/RHSA-2025:2874Advisory