← CVE Intelligence

CVE-2026-33999

Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Red Hat / Red Hat Enterprise Linux 10unaffected 0:24.1.5-6.el10_1 before *
Red Hat / Red Hat Enterprise Linux 10unaffected 0:24.1.9-4.el10_2 before *
Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Supportunaffected 0:24.1.5-6.el10_0 before *
Red Hat / Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONunaffected 0:1.1.0-25.el6_10.16 before *
Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Supportunaffected 0:1.20.4-34.el7_9 before *
Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Supportunaffected 0:1.8.0-36.el7_9.4 before *
Red Hat / Red Hat Enterprise Linux 8unaffected 0:21.1.3-20.el8_10 before *
Red Hat / Red Hat Enterprise Linux 8unaffected 0:1.20.11-28.el8_10 before *
Red Hat / Red Hat Enterprise Linux 8unaffected 0:1.15.0-9.el8_10 before *
Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportunaffected 0:1.20.10-4.el8_4 before *
Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportunaffected 0:1.11.0-8.el8_4.15 before *
Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onunaffected 0:1.20.10-4.el8_4 before *
Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onunaffected 0:1.11.0-8.el8_4.15 before *
Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportunaffected 0:21.1.3-2.el8_6.6 before *
Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportunaffected 0:1.20.11-7.el8_6 before *
Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportunaffected 0:1.12.0-6.el8_6.17 before *
Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onunaffected 0:1.12.0-6.el8_6.17 before *
Red Hat / Red Hat Enterprise Linux 8.6 Telecommunications Update Serviceunaffected 0:21.1.3-2.el8_6.6 before *
Red Hat / Red Hat Enterprise Linux 8.6 Telecommunications Update Serviceunaffected 0:1.20.11-7.el8_6 before *
Red Hat / Red Hat Enterprise Linux 8.6 Update Services for SAP Solutionsunaffected 0:21.1.3-2.el8_6.6 before *
Red Hat / Red Hat Enterprise Linux 8.6 Update Services for SAP Solutionsunaffected 0:1.20.11-7.el8_6 before *
Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Serviceunaffected 0:21.1.3-13.el8_8 before *
Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Serviceunaffected 0:1.20.11-18.el8_8 before *
Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Serviceunaffected 0:1.12.0-15.el8_8.17 before *
Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionsunaffected 0:21.1.3-13.el8_8 before *
Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionsunaffected 0:1.20.11-18.el8_8 before *
Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionsunaffected 0:1.12.0-15.el8_8.17 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:1.15.0-6.el9_7.1 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:23.2.7-6.el9_7 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:1.20.11-33.el9_7 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:1.15.0-7.el9_8.1 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:1.20.11-34.el9_8 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:24.1.9-4.el9_8 before *
Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutionsunaffected 0:21.1.3-5.el9_0 before *
Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutionsunaffected 0:1.20.11-13.el9_0 before *
Red Hat / Red Hat Enterprise Linux 9.0 Update Services for SAP Solutionsunaffected 0:1.11.0-22.el9_0.17 before *
Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutionsunaffected 0:21.1.3-10.el9_2 before *
Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutionsunaffected 0:1.20.11-20.el9_2 before *
Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutionsunaffected 0:1.12.0-14.el9_2.14 before *
Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Supportunaffected 0:1.20.11-28.el9_4 before *
Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Supportunaffected 0:22.1.9-8.el9_4 before *
Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Supportunaffected 0:1.13.1-8.el9_4.9 before *
Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Supportunaffected 0:1.20.11-33.el9_6 before *
Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Supportunaffected 0:23.2.7-6.el9_6 before *
Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Supportunaffected 0:1.14.1-10.el9_6 before *
Red Hat / Red Hat Enterprise Linux 6unknown

CWE

CWE-191

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

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.