VULNpocalypse

CVE-2026-50264: Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds heap write in dri2 drigetbuffers/drigetbufferswithformat

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

Generated by VEDAS. Scores as of 2026-11-11 15:49 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.

What it is

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.

Description quoted from the CVE record (assigned by redhat, published 2026-06-05).

Weakness: Out-of-bounds Write

How it can be exploited

Exploitable with local access with low attack complexity needing low privileges and no user interaction. Impact: 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

CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: no. Technical impact: total.

Public exploit evidence (Exploit Observer)

Exploit Observer found 1 research write-up naming this CVE.

See all 11 references on Exploit Observer

Live scores

EPSS
0.001
low predicted chance of attack
VEDAS
0.794
likely exploited
On CISA KEV
Not listed
Detection rule
No public rule yet

Who is affected

ProductAffectedNot affected
Red Hat Enterprise Linux 10 (xorg-x11-server-Xwayland)Not stated0:24.1.9-4.el10_2.2 is not affected (up to *)
Red Hat Enterprise Linux 10.0 Extended Update Support (xorg-x11-server-Xwayland)Not stated0:24.1.5-6.el10_0.1 is not affected (up to *)
Red Hat Enterprise Linux 7 Extended Lifecycle Support (xorg-x11-server)Not stated0:1.20.4-35.el7_9 is not affected (up to *)
Red Hat Enterprise Linux 7 Extended Lifecycle Support (tigervnc)Not stated0:1.8.0-36.el7_9.5 is not affected (up to *)
Red Hat Enterprise Linux 8 (xorg-x11-server-Xwayland)Not stated0:21.1.3-20.el8_10.2 is not affected (up to *)
Red Hat Enterprise Linux 8 (xorg-x11-server)Not stated0:1.20.11-28.el8_10.2 is not affected (up to *)
Red Hat Enterprise Linux 8 (tigervnc)Not stated0:1.15.0-10.el8_10 is not affected (up to *)
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (xorg-x11-server)Not stated0:1.20.10-5.el8_4 is not affected (up to *)
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (tigervnc)Not stated0:1.11.0-8.el8_4.16 is not affected (up to *)
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (xorg-x11-server)Not stated0:1.20.10-5.el8_4 is not affected (up to *)
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (tigervnc)Not stated0:1.11.0-8.el8_4.16 is not affected (up to *)
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (xorg-x11-server)Not stated0:1.20.11-8.el8_6 is not affected (up to *)
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (xorg-x11-server-Xwayland)Not stated0:21.1.3-2.el8_6.7 is not affected (up to *)
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (tigervnc)Not stated0:1.12.0-6.el8_6.18 is not affected (up to *)
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (xorg-x11-server)Not stated0:1.20.11-8.el8_6 is not affected (up to *)
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (xorg-x11-server-Xwayland)Not stated0:21.1.3-2.el8_6.7 is not affected (up to *)
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (tigervnc)Not stated0:1.12.0-6.el8_6.18 is not affected (up to *)
Red Hat Enterprise Linux 8.8 Telecommunications Update Service (xorg-x11-server)Not stated0:1.20.11-19.el8_8 is not affected (up to *)
Red Hat Enterprise Linux 8.8 Telecommunications Update Service (xorg-x11-server-Xwayland)Not stated0:21.1.3-13.el8_8.1 is not affected (up to *)
Red Hat Enterprise Linux 8.8 Telecommunications Update Service (tigervnc)Not stated0:1.12.0-15.el8_8.18 is not affected (up to *)

17 more products are listed in the CVE record.

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

How to fix it

Vendor guidance:

19 more

How to detect it

There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.

References

Vendor advisories and patches

15 more

Technical analysis and advisories

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.

Supporting partners

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