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      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
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        "category": "summary",
        "text": "An update for xorg-x11-server is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
        "title": "Topic"
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        "text": "X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.\n\nSecurity Fix(es):\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch (CVE-2026-50256)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence() (CVE-2026-50257)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels (CVE-2026-50258)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing (CVE-2026-50259)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter() (CVE-2026-50260)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter() (CVE-2026-50261)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes (CVE-2026-50262)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow() (CVE-2026-50263)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
        "title": "Details"
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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
        "title": "Terms of Use"
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      "acknowledgments": [
        {
          "names": [
            "Anonymous"
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          "organization": "Trend Micro Zero Day Initiative",
          "summary": "Acknowledged by upstream."
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      "cve": "CVE-2026-50256",
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          "category": "description",
          "text": "A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between the X server and the libXfont2 library\u0027s maximum font name length can cause a stack buffer overflow during font alias resolution. The server allocates a 256 byte stack buffer but libXfont2\u0027s alias target name length is 1024 bytes. A font alias name between 257 and 1023 bytes causes the X server to copy that name into the undersized stack buffer without further checks. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
          "title": "Vulnerability description"
        },
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          "category": "summary",
          "text": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, the X server allocates a 256-byte stack buffer for font alias resolution but libXfont2 permits alias target names up to 1024 bytes. A local X client requesting a font alias between 257 and 1023 bytes triggers a stack buffer overflow. Any local user who can connect to the X server display can attempt exploitation. This may crash the display server or, where the X server runs with elevated privileges, could contribute to local privilege escalation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "category": "impact",
          "details": "Important"
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      ],
      "title": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Anonymous"
          ],
          "organization": "Trend Micro Zero Day Initiative",
          "summary": "Acknowledged by upstream."
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      "cve": "CVE-2026-50257",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
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      "discovery_date": "2026-05-15T03:14:46+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2485382"
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        {
          "category": "description",
          "text": "A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection destroys the fence, causing the use-after-free. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, a local X client can trigger a use-after-free function pointer call in miSyncDestroyFence() by setting up a fence trigger on one connection and destroying the fence from a second connection. Any local user who can connect to the X server display can attempt exploitation. This may crash the display server or, where the X server runs with elevated privileges, could contribute to local privilege escalation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50257"
        },
        {
          "category": "external",
          "summary": "RHBZ#2485382",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485382"
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          "category": "external",
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          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50257"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50257",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50257"
        },
        {
          "category": "external",
          "summary": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/f5abfb61994471023d8c6470428c8e30c411cc0b",
          "url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/f5abfb61994471023d8c6470428c8e30c411cc0b"
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          "category": "external",
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          "summary": "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          "category": "impact",
          "details": "Important"
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      ],
      "title": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Anonymous"
          ],
          "organization": "Trend Micro Zero Day Initiative",
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2026-50258",
      "cwe": {
        "id": "CWE-121",
        "name": "Stack-based Buffer Overflow"
      },
      "discovery_date": "2026-05-15T03:14:46+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2485383"
        }
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      "notes": [
        {
          "category": "description",
          "text": "A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify or clamp non-canonical key types to XkbMaxShiftLevel. A client can change key types to excessive shift levels and trigger stack overflows. This is caused by an incomplete fix of CVE-2025-26597. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, CheckKeyTypes() does not clamp non-canonical keyboard types to XkbMaxShiftLevel. A local X client can set excessive shift levels and trigger stack buffer overflows in multiple code paths. This is an incomplete fix of CVE-2025-26597. Any local user who can connect to the X server display can attempt exploitation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50258"
        },
        {
          "category": "external",
          "summary": "RHBZ#2485383",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485383"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-50258",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50258"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50258",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50258"
        },
        {
          "category": "external",
          "summary": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/543e108516428fc8c3bea91d6563ad266f9a801e",
          "url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/543e108516428fc8c3bea91d6563ad266f9a801e"
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          "category": "external",
          "summary": "https://lists.x.org/archives/xorg-announce/2026-June/003702.html",
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          "category": "external",
          "summary": "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Anonymous"
          ],
          "organization": "Trend Micro Zero Day Initiative",
          "summary": "Acknowledged by upstream."
        }
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      "cve": "CVE-2026-50259",
      "cwe": {
        "id": "CWE-121",
        "name": "Stack-based Buffer Overflow"
      },
      "discovery_date": "2026-05-15T03:14:46+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2485384"
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      "notes": [
        {
          "category": "description",
          "text": "A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, _XkbSetMapChecks() uses a fixed 256-element stack buffer mapWidths[] indexed by a client-controlled key type index. CheckKeyTypes() writes beyond the buffer boundary, causing a stack buffer overflow. Any local user who can connect to the X server display can attempt exploitation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50259"
        },
        {
          "category": "external",
          "summary": "RHBZ#2485384",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485384"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-50259",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50259"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50259",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50259"
        },
        {
          "category": "external",
          "summary": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/867b59b33bee669cb412f1314e47c52eacf6e00b",
          "url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/867b59b33bee669cb412f1314e47c52eacf6e00b"
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          "category": "external",
          "summary": "https://lists.x.org/archives/xorg-announce/2026-June/003702.html",
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        {
          "category": "external",
          "summary": "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
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      "release_date": "2026-06-02T00:00:00+00:00",
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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          "category": "impact",
          "details": "Important"
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      ],
      "title": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Anonymous"
          ],
          "organization": "Trend Micro Zero Day Initiative",
          "summary": "Acknowledged by upstream."
        }
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      "cve": "CVE-2026-50260",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
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      "discovery_date": "2026-05-15T03:14:46+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2485385"
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        {
          "category": "description",
          "text": "A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, a local X client can trigger a use-after-free in FreeCounter() by creating SyncCounters and awaiting triggers on one connection while destroying those counters from a second connection. Any local user who can connect to the X server display can attempt exploitation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50260"
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        {
          "category": "external",
          "summary": "RHBZ#2485385",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485385"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-50260",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50260"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50260",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50260"
        },
        {
          "category": "external",
          "summary": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/f5abfb61994471023d8c6470428c8e30c411cc0b",
          "url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/f5abfb61994471023d8c6470428c8e30c411cc0b"
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          "category": "external",
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          "category": "external",
          "summary": "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
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          "category": "impact",
          "details": "Important"
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      ],
      "title": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Anonymous"
          ],
          "organization": "Trend Micro Zero Day Initiative",
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2026-50261",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
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      "discovery_date": "2026-05-15T03:14:46+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2485386"
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        {
          "category": "description",
          "text": "A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter(). A client that sets up multiple SyncCounters can trigger a use-after-free when destroying those counters via a second client connection while changing those counters. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, a local X client can trigger a use-after-free in SyncChangeCounter() by creating SyncCounters on one connection while changing and destroying them from a second connection. Any local user who can connect to the X server display can attempt exploitation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50261"
        },
        {
          "category": "external",
          "summary": "RHBZ#2485386",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485386"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-50261",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50261"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50261",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50261"
        },
        {
          "category": "external",
          "summary": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/bdd7bf57af208b1ddf57d4683d67104443b44812",
          "url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/bdd7bf57af208b1ddf57d4683d67104443b44812"
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          "category": "external",
          "summary": "https://lists.x.org/archives/xorg-announce/2026-June/003702.html",
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          "category": "external",
          "summary": "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
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            "userInteraction": "NONE",
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        {
          "category": "impact",
          "details": "Important"
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      ],
      "title": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Anonymous"
          ],
          "organization": "Trend Micro Zero Day Initiative",
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2026-50262",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "discovery_date": "2026-05-15T03:14:46+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2485387"
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      "notes": [
        {
          "category": "description",
          "text": "An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this issue as Moderate impact. In xorg-x11-server and xorg-x11-server-Xwayland, __glXDisp_ChangeDrawableAttributes() validates request size incorrectly, allowing a local X client to read bytes beyond the GLX request buffer\u2014information disclosure. An out-of-bounds write path also exists but requires byte-swapped clients, which is disabled by default on Red Hat builds. Any local user who can connect to the X server display can trigger the read path. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50262"
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        {
          "category": "external",
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485387"
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          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50262"
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          "category": "external",
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50262"
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        {
          "category": "external",
          "summary": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/6d459e4daf715bea8abdafa8fb130be2f8a1d145",
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          "summary": "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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        {
          "category": "impact",
          "details": "Moderate"
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      ],
      "title": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Anonymous"
          ],
          "organization": "Trend Micro Zero Day Initiative",
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2026-50263",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
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      "discovery_date": "2026-05-15T03:14:46+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2485388"
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      "notes": [
        {
          "category": "description",
          "text": "A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow()",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this issue as Moderate impact. In xorg-x11-server and xorg-x11-server-Xwayland, a local X client can trigger a use-after-free read in CreateSaverWindow() by changing window attributes and forcing the screen saver, leaking server memory to the client. Any local user who can connect to the X server display can attempt exploitation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50263"
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        {
          "category": "external",
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485388"
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-50263",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50263"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50263",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50263"
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        {
          "category": "external",
          "summary": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05",
          "url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05"
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          "category": "external",
          "summary": "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
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            "userInteraction": "NONE",
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        {
          "category": "impact",
          "details": "Moderate"
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      ],
      "title": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow()"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Peter Hutterer"
          ],
          "organization": "Red Hat",
          "summary": "This issue was discovered by Red Hat."
        }
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      "cve": "CVE-2026-50264",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "discovery_date": "2026-05-15T03:14:46+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2485389"
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      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, a local X client that requests multiple DRI2BufferBackLeft attachments together with DRI2BufferFrontLeft can trigger an out-of-bounds heap write in DRIGetBuffers/DRIGetBuffersWithFormat. Any local user with X display access can trigger this. It may crash the server or, where the X server runs with elevated privileges, could contribute to local privilege escalation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-50264"
        },
        {
          "category": "external",
          "summary": "RHBZ#2485389",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485389"
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          "category": "external",
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          "url": "https://www.cve.org/CVERecord?id=CVE-2026-50264"
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          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-50264",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50264"
        },
        {
          "category": "external",
          "summary": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/339c279514326134b0878fc23ce6e9520440ce7f",
          "url": "https://gitlab.freedesktop.org/xorg/xserver/-/commit/339c279514326134b0878fc23ce6e9520440ce7f"
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          "category": "external",
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          "category": "external",
          "summary": "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
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            "confidentialityImpact": "HIGH",
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            "AppStream-8.8.0.Z.TUS:xorg-x11-server-Xdmx-debuginfo-0:1.20.11-19.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:xorg-x11-server-Xephyr-0:1.20.11-19.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:xorg-x11-server-Xephyr-debuginfo-0:1.20.11-19.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:xorg-x11-server-Xnest-0:1.20.11-19.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:xorg-x11-server-Xnest-debuginfo-0:1.20.11-19.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:xorg-x11-server-Xorg-0:1.20.11-19.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:xorg-x11-server-Xorg-debuginfo-0:1.20.11-19.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:xorg-x11-server-Xvfb-0:1.20.11-19.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:xorg-x11-server-Xvfb-debuginfo-0:1.20.11-19.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:xorg-x11-server-common-0:1.20.11-19.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:xorg-x11-server-debuginfo-0:1.20.11-19.el8_8.x86_64",
            "AppStream-8.8.0.Z.TUS:xorg-x11-server-debugsource-0:1.20.11-19.el8_8.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat"
    }
  ]
}