Integer overflow in Red Hat Enterprise Linux 10
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…
EPSS: 0.000 (0.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Red Hat Enterprise Linux 10 — versions 0:24.1.5-6.el10_1, 0:24.1.9-4.el10_2
- Red Hat Enterprise Linux 10.0 Extended Update Support — versions 0:24.1.5-6.el10_0
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 6 Extended Lifecycle Support - Extension — versions 0:1.1.0-25.el6_10.16
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 7 Extended Lifecycle Support — versions 0:1.20.4-34.el7_9, 0:1.8.0-36.el7_9.4
- Red Hat Enterprise Linux 8 — versions 0:21.1.3-20.el8_10, 0:1.20.11-28.el8_10, 0:1.15.0-9.el8_10
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support — versions 0:1.11.0-8.el8_4.15, 0:1.20.10-4.el8_4
- Red Hat Enterprise Linux 8.4 Extended Update Support Long-life Add-on — versions 0:1.11.0-8.el8_4.15, 0:1.20.10-4.el8_4
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support — versions 0:21.1.3-2.el8_6.6, 0:1.20.11-7.el8_6
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
- secalert@redhat.com (x_refsource_REDHAT, issue-tracking)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
Frequently asked questions
- What is CVE-2026-33999?
- CVE-2026-33999 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Integer Underflow. CVSS score: 7.8/10. Published 2026-04-23.
- How severe is CVE-2026-33999?
- High severity. CVSS v3 base score is 7.8 out of 10.