CVE-2026-33999
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.
Published:Apr 23, 2026
Last Modified:Jun 8, 2026
EPS:Apr 23, 2026
EPSS Score:0.00005
CVSS Score:7.8
Affected Products
Vendor
Product
Action
Vendor
Redhat
Product
Enterprise Linux
Redhat
Enterprise Linux
Vendor
Redhat
Product
Enterprise Linux Eus
Redhat
Enterprise Linux Eus
Vendor
Redhat
Product
Rhel Aus
Redhat
Rhel Aus
Vendor
Redhat
Product
Rhel E4s
Redhat
Rhel E4s
Vendor
Redhat
Product
Rhel Els
Redhat
Rhel Els
Vendor
Redhat
Product
Rhel Eus
Redhat
Rhel Eus
Vendor
Redhat
Product
Rhel Eus Long Life
Redhat
Rhel Eus Long Life
Vendor
Redhat
Product
Rhel Tus
Redhat
Rhel Tus
Exploits
No exploit reference
Common Weakness Enumeration
Common Attack Pattern Enumeration and Classification (CAPEC)
No CAPEC recorded yet
Related CVEs
References
Common Vulnerability Scoring System
Attack Vector
Network
Adjacent
Local
Physical
Privileges Required
None
Low
High
User Interaction
None
Required
Scope
Unchanged
Changed
Confidentiality
None
Low
High
Integrity
None
Low
High
Availability
None
Low
High
