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CVE-2026-50264 Red Hat CVE debrief

CVE-2026-50264 is a HIGH severity vulnerability with a CVSS score of 7.8. 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.

Vendor
Red Hat
Product
Red Hat Enterprise Linux 10
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-07-27
Advisory published
2026-06-05
Advisory updated
2026-07-27

Who should care

Users of X.Org X server and Xwayland should apply patches or mitigations to prevent exploitation of this vulnerability.

Technical summary

The vulnerability exists in the DRIGetBuffers/DRIGetBuffersWithFormat functions of the X.Org X server and Xwayland. An out-of-bounds write can occur when a client requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft attachment.

Defensive priority

HIGH

Recommended defensive actions

  • Apply patches or updates from the vendor as soon as possible.
  • Restrict access to the X server to trusted users only.
  • Monitor for suspicious activity on the X server.

Evidence notes

The CVE record was published on [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-50264). The NVD detail page is available at [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-50264). Additional information can be found at [ref-4](https://access.redhat.com/security/cve/CVE-2026-50264), [ref-5](https://bugzilla.redhat.com/show_bug.cgi?id=2485389), [ref-6](https://gitlab.freedesktop.org/xorg/xserver/-/commit/339c279514326134b0878fc23ce6e9520440ce7f), [ref-7](https://lists.x.org/archives/xorg-announce/2026-June/003702.html), and [ref-8](https://redhat.atlassian.net/browse/PSIRTSUPT-16950).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50264 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50264

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-50264 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50264

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.