CVE-2026-50264
published 2026-06-05CVE-2026-50264: An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat. A client that requests multiple…
PriorityP347high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.15%
4.4th percentile
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.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| the_x.org_foundation | xorg-x11-server | — | — |
| x.org | x_server | < 21.1.23 | 21.1.23 |
| x.org | xwayland | < 24.1.12 | 24.1.12 |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_redhat7.8HIGH
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VulDB
X.org X11 Server Attachments out-of-bounds write (Nessus ID 318740 / WID-SEC-2026-1774)
vuldb·2026-06-06·CVSS 7.8
CVE-2026-50264 [HIGH] X.org X11 Server Attachments out-of-bounds write (Nessus ID 318740 / WID-SEC-2026-1774)
A vulnerability, which was classified as critical, has been found in X.org X11 Server. This affects an unknown function of the component Attachments Handler. The manipulation leads to out-of-bounds write.
This vulnerability is referenced as CVE-2026-50264. The attack can only be performed from a local environment. No exploit is available.
GHSA
An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat.
ghsa_unreviewed·2026-06-05
CVE-2026-50264 [HIGH] CWE-787 An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat.
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.
Red Hat
xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat
vendor_redhat·2026-06-02·CVSS 7.8
CVE-2026-50264 [HIGH] CWE-787 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat
xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat
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.
Package: xorg-x11-server-Xwayland (Red Hat Enterprise Linux 10) - Affected
Package: xorg-x11-server (Red Hat Enterprise Linux 6) - Out of support scope
Package: xorg-x11-server (Red Hat Enterprise Linux 7) - Affected
Package: xorg-x11-server (Red Hat Enterprise Linux 8) - Affected
Package: xorg-x11-server-Xwayland (Red
No detection rules found.
No public exploits indexed.
https://access.redhat.com/errata/RHSA-2026:26562https://access.redhat.com/errata/RHSA-2026:26566https://access.redhat.com/errata/RHSA-2026:26590https://access.redhat.com/errata/RHSA-2026:26610https://access.redhat.com/errata/RHSA-2026:26709https://access.redhat.com/errata/RHSA-2026:28923https://access.redhat.com/errata/RHSA-2026:29844https://access.redhat.com/security/cve/CVE-2026-50264https://bugzilla.redhat.com/show_bug.cgi?id=2485389https://gitlab.freedesktop.org/xorg/xserver/-/commit/339c279514326134b0878fc23ce6e9520440ce7fhttps://lists.x.org/archives/xorg-announce/2026-June/003702.htmlhttps://redhat.atlassian.net/browse/PSIRTSUPT-16950https://access.redhat.com/errata/RHSA-2026:26562https://access.redhat.com/errata/RHSA-2026:26566https://access.redhat.com/errata/RHSA-2026:26590https://access.redhat.com/errata/RHSA-2026:26610https://access.redhat.com/errata/RHSA-2026:26709https://access.redhat.com/errata/RHSA-2026:28923https://access.redhat.com/errata/RHSA-2026:29844https://access.redhat.com/security/cve/CVE-2026-50264https://bugzilla.redhat.com/show_bug.cgi?id=2485389https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50264.json
2026-06-05
Published