Vulnerability Description
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:10739
- https://access.redhat.com/errata/RHSA-2026:11352
- https://access.redhat.com/errata/RHSA-2026:11369
- https://access.redhat.com/errata/RHSA-2026:11388
- https://access.redhat.com/errata/RHSA-2026:11656
- https://access.redhat.com/errata/RHSA-2026:11692
- https://access.redhat.com/errata/RHSA-2026:13414
- https://access.redhat.com/errata/RHSA-2026:19125
- https://access.redhat.com/errata/RHSA-2026:19342
- https://access.redhat.com/errata/RHSA-2026:19343
- https://access.redhat.com/errata/RHSA-2026:19344
- https://access.redhat.com/security/cve/CVE-2026-33999
- https://bugzilla.redhat.com/show_bug.cgi?id=2451106
FAQ
What is CVE-2026-33999?
CVE-2026-33999 is a vulnerability with a CVSS score of 7.8 (HIGH). A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a...
How severe is CVE-2026-33999?
CVE-2026-33999 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33999?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.