CVE-2026-56000 (GCVE-0-2026-56000)

Vulnerability from cvelistv5 – Published: 2026-07-08 07:36 – Updated: 2026-07-08 08:12
VLAI
Title
xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()
Summary
Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a Heap Use After Free, due to CommonMakeCurrent() pointing into potentially reallocated memory.
Severity
9 (Critical)
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CWE
Assigner
References
Impacted products
Vendor Product Version
X.Org xorg-x11-server Affected: 0 , < 21.1.24 (rpm)
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X.Org xwayland Affected: 0 , < 24.1.13 (rpmver)
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Date Public
2026-07-08 07:30
Credits
Anonymous working with Trend Micro Zero Day Initiative.
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            "Recovery": "NOT_DEFINED",
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              "description": "CWE-416 Use after free",
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        "dateUpdated": "2026-07-08T08:12:50.380Z",
        "orgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb",
        "shortName": "suse"
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          "url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/2779affbdb4354e894f490e56f962527d6125043"
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        }
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      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()",
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    "assignerShortName": "suse",
    "cveId": "CVE-2026-56000",
    "datePublished": "2026-07-08T07:36:15.357Z",
    "dateReserved": "2026-06-18T09:26:55.988Z",
    "dateUpdated": "2026-07-08T08:12:50.380Z",
    "state": "PUBLISHED"
  },
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.