CVE-2026-33999— Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
X.Org X Server是X.Org基金会的一款X Window系统显示服务器。 X.Org X Server存在数字错误漏洞，该漏洞源于XKB兼容映射处理中的整数下溢，可能导致攻击者触发缓冲区读取溢出，进而导致内存安全违规和拒绝服务。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 46
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | 0:24.1.5-6.el10_1< * |
unaffected |
0:24.1.9-4.el10_2< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | 0:24.1.5-6.el10_0< * |
unaffected |
| Red Hat | Red Hat Enterprise Linux 6 | any |
unknown |
| Red Hat | Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | 0:1.1.0-25.el6_10.16< * |
unaffected |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | 0:1.20.4-34.el7_9< * |
unaffected |
0:1.8.0-36.el7_9.4< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8 | 0:21.1.3-20.el8_10< * |
unaffected |
0:1.20.11-28.el8_10< * |
unaffected | ||
0:1.15.0-9.el8_10< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | 0:1.20.10-4.el8_4< * |
unaffected |
0:1.11.0-8.el8_4.15< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | 0:1.20.10-4.el8_4< * |
unaffected |
0:1.11.0-8.el8_4.15< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | 0:21.1.3-2.el8_6.6< * |
unaffected |
0:1.20.11-7.el8_6< * |
unaffected | ||
0:1.12.0-6.el8_6.17< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | 0:1.12.0-6.el8_6.17< * |
unaffected |
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | 0:21.1.3-2.el8_6.6< * |
unaffected |
0:1.20.11-7.el8_6< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | 0:21.1.3-2.el8_6.6< * |
unaffected |
0:1.20.11-7.el8_6< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | 0:21.1.3-13.el8_8< * |
unaffected |
0:1.20.11-18.el8_8< * |
unaffected | ||
0:1.12.0-15.el8_8.17< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | 0:21.1.3-13.el8_8< * |
unaffected |
0:1.20.11-18.el8_8< * |
unaffected | ||
0:1.12.0-15.el8_8.17< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 9 | 0:1.15.0-6.el9_7.1< * |
unaffected |
0:23.2.7-6.el9_7< * |
unaffected | ||
0:1.20.11-33.el9_7< * |
unaffected | ||
0:1.15.0-7.el9_8.1< * |
unaffected | ||
0:1.20.11-34.el9_8< * |
unaffected | ||
0:24.1.9-4.el9_8< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | 0:21.1.3-5.el9_0< * |
unaffected |
0:1.20.11-13.el9_0< * |
unaffected | ||
0:1.11.0-22.el9_0.17< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | 0:21.1.3-10.el9_2< * |
unaffected |
0:1.20.11-20.el9_2< * |
unaffected | ||
0:1.12.0-14.el9_2.14< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | 0:1.20.11-28.el9_4< * |
unaffected |
0:22.1.9-8.el9_4< * |
unaffected | ||
0:1.13.1-8.el9_4.9< * |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | 0:1.20.11-33.el9_6< * |
unaffected |
0:23.2.7-6.el9_6< * |
unaffected | ||
0:1.14.1-10.el9_6< * |
unaffected |
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I. Basic Information for CVE-2026-33999
Vulnerability Information
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Vulnerability Title
Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
X.Org X Server 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
X.Org X Server是X.Org基金会的一款X Window系统显示服务器。 X.Org X Server存在数字错误漏洞，该漏洞源于XKB兼容映射处理中的整数下溢，可能导致攻击者触发缓冲区读取溢出，进而导致内存安全违规和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | 0:24.1.5-6.el10_1 ~ * |
cpe:/o:redhat:enterprise_linux:10.1
|
|
| Red Hat | Red Hat Enterprise Linux 10 | 0:24.1.9-4.el10_2 ~ * |
cpe:/o:redhat:enterprise_linux:10.2
|
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | 0:24.1.5-6.el10_0 ~ * |
cpe:/o:redhat:enterprise_linux_eus:10.0
|
|
| Red Hat | Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | 0:1.1.0-25.el6_10.16 ~ * |
cpe:/o:redhat:rhel_els:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | 0:1.20.4-34.el7_9 ~ * |
cpe:/o:redhat:rhel_els:7
|
|
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | 0:1.8.0-36.el7_9.4 ~ * |
cpe:/o:redhat:rhel_els:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | 0:21.1.3-20.el8_10 ~ * |
cpe:/a:redhat:enterprise_linux:8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8 | 0:1.20.11-28.el8_10 ~ * |
cpe:/a:redhat:enterprise_linux:8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8 | 0:1.15.0-9.el8_10 ~ * |
cpe:/a:redhat:enterprise_linux:8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | 0:1.20.10-4.el8_4 ~ * |
cpe:/a:redhat:rhel_aus:8.4::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | 0:1.11.0-8.el8_4.15 ~ * |
cpe:/a:redhat:rhel_aus:8.4::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | 0:1.20.10-4.el8_4 ~ * |
cpe:/a:redhat:rhel_aus:8.4::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | 0:1.11.0-8.el8_4.15 ~ * |
cpe:/a:redhat:rhel_aus:8.4::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | 0:21.1.3-2.el8_6.6 ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | 0:1.20.11-7.el8_6 ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | 0:1.12.0-6.el8_6.17 ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | 0:1.12.0-6.el8_6.17 ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | 0:21.1.3-2.el8_6.6 ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | 0:1.20.11-7.el8_6 ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | 0:21.1.3-2.el8_6.6 ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | 0:1.20.11-7.el8_6 ~ * |
cpe:/a:redhat:rhel_aus:8.6::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | 0:21.1.3-13.el8_8 ~ * |
cpe:/a:redhat:rhel_e4s:8.8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | 0:1.20.11-18.el8_8 ~ * |
cpe:/a:redhat:rhel_e4s:8.8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | 0:1.12.0-15.el8_8.17 ~ * |
cpe:/a:redhat:rhel_e4s:8.8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | 0:21.1.3-13.el8_8 ~ * |
cpe:/a:redhat:rhel_e4s:8.8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | 0:1.20.11-18.el8_8 ~ * |
cpe:/a:redhat:rhel_e4s:8.8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | 0:1.12.0-15.el8_8.17 ~ * |
cpe:/a:redhat:rhel_e4s:8.8::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 9 | 0:1.15.0-6.el9_7.1 ~ * |
cpe:/a:redhat:enterprise_linux:9::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 9 | 0:23.2.7-6.el9_7 ~ * |
cpe:/a:redhat:enterprise_linux:9::appstream
|
|
| Red Hat | Red Hat Enterprise Linux 9 | 0:1.20.11-33.el9_7 ~ * |
cpe:/a:redhat:enterprise_linux:9::appstream
|
|
II. Public POCs for CVE-2026-33999
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Vendor Advisories for CVE-2026-33999 (19)
-
🔗 RHSA-2026:11692 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:20558 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
-
🔗 RHSA-2026:20560 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:19342 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:11352 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:24341 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:23254 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:20563 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:23496 - Security Advisory - Red Hat 客户门户网站 Read full article vendor-advisory x_refsource_REDHAT
-
-
🔗 RHSA-2026:20557 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
-
🔗 RHSA-2026:11369 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
-
🔗 RHSA-2026:13414 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
-
🔗 RHSA-2026:20561 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
-
🔗 RHSA-2026:21718 - Security Advisory - Red Hat Customer Portal Read full article vendor-advisory x_refsource_REDHAT
Other References for CVE-2026-33999 (14)
Same Patch Batch · Red Hat · 2026-04-23 · 6 CVEs total
| CVE-2026-34003 | 7.8 HIGH | Xorg: xwayland: x.org x server: information exposure and denial of service via out-of-boun |
| CVE-2026-34001 | 7.8 HIGH | Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and pot |
| CVE-2026-6732 | 6.5 MEDIUM | Libxml2: libxml2: denial of service via crafted xsd-validated document |
| CVE-2025-66286 | 4.7 MEDIUM | Webkitgtk: authorization bypass through webpage::send-request signal handler |
| CVE-2026-2708 | 3.7 LOW | Libsoup: libsoup: http request smuggling via duplicate content-length headers |
IV. Related Vulnerabilities
Same product: Red Hat Enterprise Linux 10
-
CVE-2026-103641
Gegl: gegl04: gegl: out-of-bounds read in the radiance hdr u -
CVE-2026-103399
Libsoup: soupserver: http/1 request smuggling via undrained -
CVE-2026-103242
Rpm: heap-based buffer overflow write in hex2binv() via a mi -
CVE-2026-102560
Libsoup: libsoup: heap buffer overflow during outgoing perme -
CVE-2026-102559
Libsoup: libsoup: heap buffer overflow during websocket clie
Same vendor: Red Hat
-
CVE-2026-103641
Gegl: gegl04: gegl: out-of-bounds read in the radiance hdr u -
CVE-2026-103399
Libsoup: soupserver: http/1 request smuggling via undrained -
CVE-2026-101295
Oc-mirror: oc-mirror: path traversal / arbitrary file write -
CVE-2026-103242
Rpm: heap-based buffer overflow write in hex2binv() via a mi -
CVE-2026-62146
Cri-o: cri-o: sandbox state poisoning via pod annotations ma
Same weakness: CWE-191
V. Comments for CVE-2026-33999
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