Vulnerability-Lookup

RHSA-2026:50100

Vulnerability from csaf_redhat - Published: 2026-08-04 14:48 - Updated: 2026-08-11 15:27

Summary

Red Hat Security Advisory: xorg-x11-server-Xwayland security update

Severity

Important

Notes

Topic: An update for xorg-x11-server-Xwayland is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red 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.

Details: Xwayland is an X server for running X clients under Wayland. Security Fix(es): * xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow (CVE-2026-55999) * X.org: xorg-x11-server: GLX contextTags Use-After-Free in CommonMakeCurrent() (CVE-2026-56000) For 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.

Terms of Use: 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.

CVE-2026-55999

A flaw was found in the glamor_font_get() function of the xorg-x11-server. This vulnerability, a heap buffer overflow, occurs when the server processes a specially crafted PCF font file where individual glyph metrics exceed the declared maximum bounds. An authenticated X client can exploit this by loading a malicious font and drawing text, potentially leading to arbitrary code execution with attacker-controlled content and extent. This affects servers utilizing the glamor acceleration backend, such as Xorg with the modesetting driver and Xwayland.

7.5 (High)


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

CWE-805 - Buffer Access with Incorrect Length Value

Affected products

Fixed 25 products

Product	Version	Remediation
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-0:24.1.5-6.el10_0.2.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-0:24.1.5-6.el10_0.2.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-0:24.1.5-6.el10_0.2.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-0:24.1.5-6.el10_0.2.src	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-0:24.1.5-6.el10_0.2.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-debuginfo-0:24.1.5-6.el10_0.2.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-debuginfo-0:24.1.5-6.el10_0.2.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-debuginfo-0:24.1.5-6.el10_0.2.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-debuginfo-0:24.1.5-6.el10_0.2.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-debugsource-0:24.1.5-6.el10_0.2.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-debugsource-0:24.1.5-6.el10_0.2.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-debugsource-0:24.1.5-6.el10_0.2.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-10.0.Z.E2S:xorg-x11-server-Xwayland-debugsource-0:24.1.5-6.el10_0.2.x86_64	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-debuginfo-0:24.1.5-6.el10_0.2.aarch64	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-debuginfo-0:24.1.5-6.el10_0.2.ppc64le	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-debuginfo-0:24.1.5-6.el10_0.2.s390x	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-debuginfo-0:24.1.5-6.el10_0.2.x86_64	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-debugsource-0:24.1.5-6.el10_0.2.aarch64	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-debugsource-0:24.1.5-6.el10_0.2.ppc64le	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-debugsource-0:24.1.5-6.el10_0.2.s390x	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-debugsource-0:24.1.5-6.el10_0.2.x86_64	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-devel-0:24.1.5-6.el10_0.2.aarch64	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-devel-0:24.1.5-6.el10_0.2.ppc64le	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-devel-0:24.1.5-6.el10_0.2.s390x	—	Vendor Fix fix
Unresolved product id: CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-devel-0:24.1.5-6.el10_0.2.x86_64	—	Vendor Fix fix

Threats

Impact Important

CVE-2026-56000

A flaw was found in the X.org X11 server, specifically within the GLX (OpenGL Extension to the X Window System) dispatch layer. A remote attacker can exploit this vulnerability by sending a series of crafted X11 requests. This can lead to a use-after-free condition, where the server attempts to write data to memory that has already been released. The primary consequence of this memory corruption is a denial of service, potentially causing the X server to crash.

6.5 (Medium)


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

CWE-825 - Expired Pointer Dereference

Affected products

Fixed 25 products, the same list as for CVE-2026-55999

Threats

Impact Important

References

13 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:50100	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2496165	external
https://bugzilla.redhat.com/show_bug.cgi?id=2496193	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-55999	self
https://bugzilla.redhat.com/show_bug.cgi?id=2496165	external
https://www.cve.org/CVERecord?id=CVE-2026-55999	external
https://nvd.nist.gov/vuln/detail/CVE-2026-55999	external
https://access.redhat.com/security/cve/CVE-2026-56000	self
https://bugzilla.redhat.com/show_bug.cgi?id=2496193	external
https://www.cve.org/CVERecord?id=CVE-2026-56000	external
https://nvd.nist.gov/vuln/detail/CVE-2026-56000	external

JSON

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          "text": "A flaw was found in the glamor_font_get() function of the xorg-x11-server. This vulnerability, a heap buffer overflow, occurs when the server processes a specially crafted PCF font file where individual glyph metrics exceed the declared maximum bounds. An authenticated X client can exploit this by loading a malicious font and drawing text, potentially leading to arbitrary code execution with attacker-controlled content and extent. This affects servers utilizing the glamor acceleration backend, such as Xorg with the modesetting driver and Xwayland.",
          "title": "Vulnerability description"
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          "text": "xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow",
          "title": "Vulnerability summary"
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          "category": "other",
          "text": "This Important flaw in xorg-x11-server allows an authenticated X client to achieve arbitrary code execution. By processing a malicious PCF font file where glyph metrics exceed declared bounds, a heap buffer overflow occurs within the glamor acceleration backend. This vulnerability primarily impacts Red Hat systems running Xorg with the modesetting driver or Xwayland, typically found in desktop environments.",
          "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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      "title": "xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow"
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          "title": "Vulnerability description"
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          "title": "Vulnerability summary"
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          "category": "other",
          "text": "An Important use-after-free vulnerability in the X.org X11 server\u0027s GLX dispatch layer allows a remote, unauthenticated attacker to trigger a denial of service. By sending a sequence of crafted X11 requests, an attacker can cause the X server to crash, impacting the availability of systems with a running graphical environment. This is considered Important due to the remote attack vector and the potential for unauthenticated denial of service.",
          "title": "Statement"
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          "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.",
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            "CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-debugsource-0:24.1.5-6.el10_0.2.x86_64",
            "CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-devel-0:24.1.5-6.el10_0.2.aarch64",
            "CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-devel-0:24.1.5-6.el10_0.2.ppc64le",
            "CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-devel-0:24.1.5-6.el10_0.2.s390x",
            "CRB-10.0.Z.E2S:xorg-x11-server-Xwayland-devel-0:24.1.5-6.el10_0.2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "X.org: xorg-x11-server: GLX contextTags Use-After-Free in CommonMakeCurrent()"
    }
  ]
}

CVE-2026-55999 (GCVE-0-2026-55999)

Vulnerability from cvelistv5 – Published: 2026-07-08 08:07 – Updated: 2026-07-09 03:55

Title

xorg-server / xwayland glamor font atlas Heap Buffer Overflow

Summary

Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks.

Severity

8.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-08 00:00 UTC

CWE

CWE-122 - Heap-based buffer overflow

Assigner

suse mitre root

References

2 references

URL	Tags
https://gitlab.freedesktop.org/xorg/xserver/-/com…	patch
https://www.openwall.com/lists/oss-security/2026/…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
X.Org	xorg-server	Affected: 0 , < 21.1.24 (rpm)
X.Org	xwayland	Affected: 0 , < 24.1.13 (rpm)

Date Public

2026-07-08 07:51

Credits

Anonymous working with Trend Micro Zero Day Initiative.

Show details on NVD website

JSON

To clipboard

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

Vulnerability from cvelistv5 – Published: 2026-07-08 07:36 – Updated: 2026-07-08 12:42

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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-08 12:41 UTC

CWE

CWE-416 - Use after free

Assigner

suse mitre root

References

2 references

URL	Tags
https://gitlab.freedesktop.org/xorg/xserver/-/com…	patch
https://www.openwall.com/lists/oss-security/2026/…	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
X.Org	xorg-x11-server	Affected: 0 , < 21.1.24 (rpm)
X.Org	xwayland	Affected: 0 , < 24.1.13 (rpmver)

Date Public

2026-07-08 07:30

Credits

Anonymous working with Trend Micro Zero Day Initiative.

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

RHSA-2026:50100

CVE-2026-55999 (GCVE-0-2026-55999)

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

Tags

Sightings

Nomenclature

Related by attack behaviour