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CVE-2026-33999

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

HIGH 7.8

At a glance

Source
NVD
EPSS
EPSS 0.38 % · percentile 32 ()
State
PUBLISHED
Published
Updated
Assigner
redhat
NVD status
Awaiting Analysis

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.

Weaknesses (CWE)

  • CWE-191 — Integer Underflow (Wrap or Wraparound)

References

Scores

VersionScoreVectorScored by
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hredhat
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hredhat-SADP
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · secalert@redhat.com (Secondary)
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary)

European references

Affected products

ProductVersions
Red Hat · Red Hat Enterprise Linux 10unaffected 0:24.1.5-6.el10_1 < *
Red Hat · Red Hat Enterprise Linux 10unaffected 0:24.1.9-4.el10_2 < *
Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Supportunaffected 0:24.1.5-6.el10_0 < *
Red Hat · Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONunaffected 0:1.1.0-25.el6_10.16 < *
Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Supportunaffected 0:1.20.4-34.el7_9 < *
Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Supportunaffected 0:1.8.0-36.el7_9.4 < *
Red Hat · Red Hat Enterprise Linux 8unaffected 0:21.1.3-20.el8_10 < *
Red Hat · Red Hat Enterprise Linux 8unaffected 0:1.20.11-28.el8_10 < *
Red Hat · Red Hat Enterprise Linux 8unaffected 0:1.15.0-9.el8_10 < *
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportunaffected 0:1.20.10-4.el8_4 < *
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportunaffected 0:1.11.0-8.el8_4.15 < *
Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onunaffected 0:1.20.10-4.el8_4 < *
Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onunaffected 0:1.11.0-8.el8_4.15 < *
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportunaffected 0:21.1.3-2.el8_6.6 < *
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportunaffected 0:1.20.11-7.el8_6 < *
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportunaffected 0:1.12.0-6.el8_6.17 < *
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onunaffected 0:1.12.0-6.el8_6.17 < *
Red Hat · Red Hat Enterprise Linux 8.6 Telecommunications Update Serviceunaffected 0:21.1.3-2.el8_6.6 < *
Red Hat · Red Hat Enterprise Linux 8.6 Telecommunications Update Serviceunaffected 0:1.20.11-7.el8_6 < *
Red Hat · Red Hat Enterprise Linux 8.6 Update Services for SAP Solutionsunaffected 0:21.1.3-2.el8_6.6 < *

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD