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

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Summary

CVECVE-2026-50264
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-05 12:16:40 UTC
Updated2026-06-25 14:16:45 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001430000 probability, percentile 0.039020000 (date 2026-06-25)

Problem Types: CWE-787 | CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Redhat Enterprise Linux 10.0 All All All
Operating System Redhat Enterprise Linux 7.0 All All All
Operating System Redhat Enterprise Linux 8.0 All All All
Operating System Redhat Enterprise Linux 9.0 All All All
Application X.org Xwayland All All All All
Application X.org X Server All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 unaffected 0:24.1.9-4.el10_2.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:21.1.3-20.el8_10.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:1.20.11-28.el8_10.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:1.15.0-10.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:24.1.9-4.el9_8.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:1.20.11-34.el9_8.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:1.15.0-7.el9_8.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/security/cve/CVE-2026-50264 [email protected] access.redhat.com Third Party Advisory
gitlab.freedesktop.org/xorg/xserver/-/commit/339c279514326134b0878fc23ce6e9520440ce7f [email protected] gitlab.freedesktop.org Patch
lists.x.org/archives/xorg-announce/2026-June/003702.html [email protected] lists.x.org Mailing List, Vendor Advisory
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com Issue Tracking, Third Party Advisory
access.redhat.com/errata/RHSA-2026:26590 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:26566 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:26709 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:29844 [email protected] access.redhat.com
redhat.atlassian.net/browse/PSIRTSUPT-16950 [email protected] redhat.atlassian.net Permissions Required
access.redhat.com/errata/RHSA-2026:26610 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:28923 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:26562 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: This issue was discovered by Peter Hutterer (Red Hat). (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-15T03:14:46.000ZReported to Red Hat.
CNA2026-06-02T00:00:00.000ZMade public.
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