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Fencer Vulns
high 7.8

CVE-2026-50264 json

Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds heap write in dri2 drigetbuffers/drigetbufferswithformat

published 2026-06-05 5 mo ago modified 2026-11-04 4 d ago also EUVD-2026-34818

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat. A client that requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft can trigger an out-of-bounds heap write. This may be used to crash the server, or for privilege escalation if the X server runs as root.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:24.1.9-4.el10_2.2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:24.1.5-6.el10_0.1
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:1.8.0-36.el7_9.5, 0:1.20.4-35.el7_9
  • Red Hat Red Hat Enterprise Linux 8 0:1.15.0-10.el8_10, 0:1.20.11-28.el8_10.2, 0:21.1.3-20.el8_10.2
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:1.11.0-8.el8_4.16, 0:1.20.10-5.el8_4
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:1.11.0-8.el8_4.16, 0:1.20.10-5.el8_4
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:1.12.0-6.el8_6.18, 0:1.20.11-8.el8_6, 0:21.1.3-2.el8_6.7
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:1.12.0-6.el8_6.18, 0:1.20.11-8.el8_6, 0:21.1.3-2.el8_6.7
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:1.12.0-15.el8_8.18, 0:1.20.11-19.el8_8, 0:21.1.3-13.el8_8.1
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:1.12.0-15.el8_8.18, 0:1.20.11-19.el8_8, 0:21.1.3-13.el8_8.1
  • Red Hat Red Hat Enterprise Linux 9 0:1.15.0-7.el9_8.2, 0:1.20.11-34.el9_8.2, 0:24.1.9-4.el9_8.2
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:1.12.0-14.el9_2.15, 0:1.20.11-21.el9_2, 0:21.1.3-10.el9_2.1
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:1.13.1-8.el9_4.10, 0:1.20.11-29.el9_4, 0:22.1.9-8.el9_4.1
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:1.14.1-11.el9_6, 0:1.20.11-34.el9_6, 0:23.2.7-6.el9_6.1
  • xwayland Debian 14 2:24.1.12-1
  • xorg-server Debian 12 2:21.1.7-3+deb12u13
  • xorg-server Debian 13 2:21.1.16-1.3+deb13u3
  • xorg-server Debian 14 2:21.1.23-1

debian advisories DEBIAN-CVE-2026-50264

  • tigervnc RHEL 9 1.15.0-7.el9_8.2
  • tigervnc-icons RHEL 9 1.15.0-7.el9_8.2
  • tigervnc-server RHEL 9 1.15.0-7.el9_8.2
  • tigervnc-license RHEL 9 1.15.0-7.el9_8.2
  • tigervnc-selinux RHEL 9 1.15.0-7.el9_8.2
  • tigervnc-server-module RHEL 9 1.15.0-7.el9_8.2
  • tigervnc-server-minimal RHEL 9 1.15.0-7.el9_8.2
  • tigervnc RHEL 8 1.15.0-10.el8_10

red hat advisories RHSA-2026:46473RHSA-2026:46456RHSA-2026:46460RHSA-2026:46392RHSA-2026:46385RHSA-2026:46382

  • tigervnc AlmaLinux 9 1.15.0-7.el9_8.2
  • tigervnc-icons AlmaLinux 9 1.15.0-7.el9_8.2
  • tigervnc-server AlmaLinux 9 1.15.0-7.el9_8.2
  • tigervnc-license AlmaLinux 9 1.15.0-7.el9_8.2
  • tigervnc-selinux AlmaLinux 9 1.15.0-7.el9_8.2
  • tigervnc-server-module AlmaLinux 9 1.15.0-7.el9_8.2
  • tigervnc-server-minimal AlmaLinux 9 1.15.0-7.el9_8.2
  • tigervnc AlmaLinux 8 1.15.0-10.el8_10

almalinux advisories ALSA-2026:29844ALSA-2026:28923ALSA-2026:26562ALSA-2026:26566ALSA-2026:26590ALSA-2026:26610

  • tigervnc Rocky Linux 9 1.15.0-7.el9_8.2
  • tigervnc Rocky Linux 8 1.15.0-10.el8_10
  • xorg-x11-server-Xwayland Rocky Linux 10 24.1.9-4.el10_2.2
  • xorg-x11-server-Xwayland Rocky Linux 9 24.1.9-4.el9_8.2
  • xorg-x11-server Rocky Linux 9 1.20.11-34.el9_8.2
  • xorg-x11-server-Xwayland Rocky Linux 8 21.1.3-20.el8_10.2
  • xorg-x11-server Rocky Linux 8 1.20.11-28.el8_10.2

rocky linux advisories RLSA-2026:29844RLSA-2026:28923RLSA-2026:26566RLSA-2026:26590RLSA-2026:26610RLSA-2026:26562

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-50264 updated cvss 7.8

xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat

  • Red Hat Enterprise Linux 6 tigervnc, tigervnc-server, xorg-x11-server, xorg-x11-server-Xdmx, xorg-x11-server-Xorg, xorg-x11-server-Xvfb, +6 more
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder EUS (v.9.6) xorg-x11-server-source 1.20.11-34.el9_6, xorg-x11-server-Xwayland 23.2.7-6.el9_6.1
    fixed: vendor fix RHSA-2026:36085
  • Red Hat Enterprise Linux AppStream (v. 8) tigervnc 1.15.0-10.el8_10, tigervnc-icons 1.15.0-10.el8_10, tigervnc-server 1.15.0-10.el8_10, tigervnc-license 1.15.0-10.el8_10, tigervnc-selinux 1.15.0-10.el8_10, xorg-x11-server 1.20.11-28.el8_10.2, +9 more
    fixed: vendor fix RHSA-2026:28923
  • Red Hat Enterprise Linux AppStream (v. 9) tigervnc 1.15.0-7.el9_8.2, tigervnc-icons 1.15.0-7.el9_8.2, tigervnc-server 1.15.0-7.el9_8.2, tigervnc-license 1.15.0-7.el9_8.2, tigervnc-selinux 1.15.0-7.el9_8.2, xorg-x11-server 1.20.11-34.el9_8.2, +9 more
    fixed: vendor fix RHSA-2026:29844
  • Red Hat Enterprise Linux AppStream (v. 10) xorg-x11-server-Xwayland 24.1.9-4.el10_2.2
    fixed: vendor fix RHSA-2026:26566
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) tigervnc 1.11.0-8.el8_4.16, xorg-x11-server 1.20.10-5.el8_4, tigervnc-icons 1.11.0-8.el8_4.16, tigervnc-server 1.11.0-8.el8_4.16, tigervnc-license 1.11.0-8.el8_4.16, tigervnc-selinux 1.11.0-8.el8_4.16, +9 more
    fixed: vendor fix RHSA-2026:46382
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) tigervnc 1.12.0-6.el8_6.18, xorg-x11-server 1.20.11-8.el8_6, tigervnc-icons 1.12.0-6.el8_6.18, tigervnc-server 1.12.0-6.el8_6.18, tigervnc-license 1.12.0-6.el8_6.18, tigervnc-selinux 1.12.0-6.el8_6.18, +9 more
    fixed: vendor fix RHSA-2026:46460
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) tigervnc 1.12.0-15.el8_8.18, xorg-x11-server 1.20.11-19.el8_8, tigervnc-icons 1.12.0-15.el8_8.18, tigervnc-server 1.12.0-15.el8_8.18, tigervnc-license 1.12.0-15.el8_8.18, tigervnc-selinux 1.12.0-15.el8_8.18, +9 more
    fixed: vendor fix RHSA-2026:46385
show 12 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) tigervnc 1.12.0-14.el9_2.15, xorg-x11-server 1.20.11-21.el9_2, tigervnc-icons 1.12.0-14.el9_2.15, tigervnc-server 1.12.0-14.el9_2.15, tigervnc-license 1.12.0-14.el9_2.15, tigervnc-selinux 1.12.0-14.el9_2.15, +9 more
    fixed: vendor fix RHSA-2026:46377
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) tigervnc 1.13.1-8.el9_4.10, tigervnc-icons 1.13.1-8.el9_4.10, xorg-x11-server 1.20.11-29.el9_4, tigervnc-server 1.13.1-8.el9_4.10, tigervnc-license 1.13.1-8.el9_4.10, tigervnc-selinux 1.13.1-8.el9_4.10, +9 more
    fixed: vendor fix RHSA-2026:46456
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) xorg-x11-server-Xwayland 24.1.5-6.el10_0.1
    fixed: vendor fix RHSA-2026:36798
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) tigervnc 1.14.1-11.el9_6, tigervnc-icons 1.14.1-11.el9_6, tigervnc-server 1.14.1-11.el9_6, tigervnc-license 1.14.1-11.el9_6, tigervnc-selinux 1.14.1-11.el9_6, xorg-x11-server 1.20.11-34.el9_6, +9 more
    fixed: vendor fix RHSA-2026:46392
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) tigervnc 1.11.0-8.el8_4.16, xorg-x11-server 1.20.10-5.el8_4, tigervnc-icons 1.11.0-8.el8_4.16, tigervnc-server 1.11.0-8.el8_4.16, tigervnc-license 1.11.0-8.el8_4.16, tigervnc-selinux 1.11.0-8.el8_4.16, +9 more
    fixed: vendor fix RHSA-2026:46382
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) tigervnc 1.12.0-6.el8_6.18, xorg-x11-server 1.20.11-8.el8_6, tigervnc-icons 1.12.0-6.el8_6.18, tigervnc-server 1.12.0-6.el8_6.18, tigervnc-license 1.12.0-6.el8_6.18, tigervnc-selinux 1.12.0-6.el8_6.18, +9 more
    fixed: vendor fix RHSA-2026:46460
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) tigervnc 1.12.0-15.el8_8.18, xorg-x11-server 1.20.11-19.el8_8, tigervnc-icons 1.12.0-15.el8_8.18, tigervnc-server 1.12.0-15.el8_8.18, tigervnc-license 1.12.0-15.el8_8.18, tigervnc-selinux 1.12.0-15.el8_8.18, +9 more
    fixed: vendor fix RHSA-2026:46385
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) xorg-x11-server-source 1.20.11-34.el9_8.2, xorg-x11-server-Xwayland 24.1.9-4.el9_8.2
    fixed: vendor fix RHSA-2026:26610
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) xorg-x11-server-Xwayland-devel 24.1.9-4.el10_2.2, xorg-x11-server-Xwayland-debuginfo 24.1.9-4.el10_2.2, xorg-x11-server-Xwayland-debugsource 24.1.9-4.el10_2.2
    fixed: vendor fix RHSA-2026:26566
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) xorg-x11-server-Xwayland-devel 24.1.5-6.el10_0.1, xorg-x11-server-Xwayland-debuginfo 24.1.5-6.el10_0.1, xorg-x11-server-Xwayland-debugsource 24.1.5-6.el10_0.1
    fixed: vendor fix RHSA-2026:36798
  • Red Hat Enterprise Linux CRB (v. 8) xorg-x11-server-source 1.20.11-28.el8_10.2
    fixed: vendor fix RHSA-2026:26709
  • Red Hat Enterprise Linux Server (v. 7 ELS) tigervnc 1.8.0-36.el7_9.5, tigervnc-icons 1.8.0-36.el7_9.5, xorg-x11-server 1.20.4-35.el7_9, tigervnc-server 1.8.0-36.el7_9.5, tigervnc-license 1.8.0-36.el7_9.5, xorg-x11-server-Xorg 1.20.4-35.el7_9, +3 more Red Hat Enterprise Linux Server Optional (v. 7 ELS) xorg-x11-server-Xdmx 1.20.4-35.el7_9, xorg-x11-server-Xvfb 1.20.4-35.el7_9, xorg-x11-server-Xnest 1.20.4-35.el7_9, xorg-x11-server-source 1.20.4-35.el7_9, tigervnc-server-applet 1.8.0-36.el7_9.5, tigervnc-server-module 1.8.0-36.el7_9.5, +1 more
    fixed: vendor fix RHSA-2026:46473

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.