WID-SEC-W-2026-3503
Vulnerability from csaf_certbund - Published: 2026-09-21 22:00 - Updated: 2026-11-12 23:00Summary
X.Org X11: Schwachstelle ermöglicht Codeausführung
Severity
Mittel
Notes
Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.
Produktbeschreibung: Das X Window System dient der Erzeugung grafischer Oberflächen auf Unix Systemen.
Angriff: Ein entfernter, anonymer Angreifer kann eine Schwachstelle in X.Org X11 ausnutzen, um potentiell Code zur Ausführung zu bringen.
Betroffene Betriebssysteme: - Linux
- UNIX
Affected products
Known affected
9 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Oracle Linux
Oracle
|
cpe:/o:oracle:linux:-
|
— | |
|
RESF Rocky Linux
RESF
|
cpe:/o:resf:rocky_linux:-
|
— | |
|
Red Hat Enterprise Linux
Red Hat
|
cpe:/o:redhat:enterprise_linux:-
|
— | |
|
Ubuntu Linux
Ubuntu
|
cpe:/o:canonical:ubuntu_linux:-
|
— | |
|
SUSE openSUSE
SUSE
|
cpe:/o:suse:opensuse:-
|
— | |
|
Fedora Linux
Fedora
|
cpe:/o:fedoraproject:fedora:-
|
— | |
|
Amazon Linux 2
Amazon
|
cpe:/o:amazon:linux_2:-
|
— | |
|
SUSE Linux
SUSE
|
cpe:/o:suse:suse_linux:-
|
— | |
|
Open Source X.Org X11 <1.8.14
Open Source / X.Org X11
|
<1.8.14 |
References
52 references
{
"document": {
"aggregate_severity": {
"text": "mittel"
},
"category": "csaf_base",
"csaf_version": "2.0",
"distribution": {
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "de-DE",
"notes": [
{
"category": "legal_disclaimer",
"text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
},
{
"category": "description",
"text": "Das X Window System dient der Erzeugung grafischer Oberfl\u00e4chen auf Unix Systemen.",
"title": "Produktbeschreibung"
},
{
"category": "summary",
"text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in X.Org X11 ausnutzen, um potentiell Code zur Ausf\u00fchrung zu bringen.",
"title": "Angriff"
},
{
"category": "general",
"text": "- Linux\n- UNIX",
"title": "Betroffene Betriebssysteme"
}
],
"publisher": {
"category": "other",
"contact_details": "csaf-provider@cert-bund.de",
"name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
"namespace": "https://www.bsi.bund.de"
},
"references": [
{
"category": "self",
"summary": "WID-SEC-W-2026-3503 - CSAF Version",
"url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3503.json"
},
{
"category": "self",
"summary": "WID-SEC-2026-3503 - Portal Version",
"url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-3503"
},
{
"category": "external",
"summary": "GitHub Security Advisory GHSA-xrgw-w7v2-3qp8 vom 2026-09-21",
"url": "https://github.com/advisories/GHSA-xrgw-w7v2-3qp8"
},
{
"category": "external",
"summary": "GitLab freedesktop vom 2026-09-21",
"url": "https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/309"
},
{
"category": "external",
"summary": "openSUSE Security Update OPENSUSE-SU-2026:11833-1 vom 2026-09-23",
"url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/VMGJMDHH5N75WKPK3RKCE2FKPV4MXMHR/"
},
{
"category": "external",
"summary": "openSUSE Security Update OPENSUSE-SU-2026:21908-1 vom 2026-09-24",
"url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/Z7UKRLBRI2CY6RNY24JJQXRWEUHT5NPR/"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:23899-1 vom 2026-09-29",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-September/029472.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:23885-1 vom 2026-09-29",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-September/029449.html"
},
{
"category": "external",
"summary": "Fedora Security Advisory FEDORA-2026-0072911D9D vom 2026-09-30",
"url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-0072911d9d"
},
{
"category": "external",
"summary": "Fedora Security Advisory FEDORA-2026-0D57B0D529 vom 2026-10-01",
"url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-0d57b0d529"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:4410-1 vom 2026-10-01",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-October/029525.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:4501-1 vom 2026-10-05",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-October/029576.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:4500-1 vom 2026-10-05",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-October/029577.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:4502-1 vom 2026-10-05",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-October/029575.html"
},
{
"category": "external",
"summary": "Amazon Linux Security Advisory ALAS2-2026-3977 vom 2026-10-13",
"url": "https://alas.aws.amazon.com/AL2/ALAS2-2026-3977.html"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-8913-1 vom 2026-10-12",
"url": "https://ubuntu.com/security/notices/USN-8913-1"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:89730 vom 2026-10-26",
"url": "https://access.redhat.com/errata/RHSA-2026:89730"
},
{
"category": "external",
"summary": "Oracle Linux Security Advisory ELSA-2026-89730 vom 2026-10-27",
"url": "http://linux.oracle.com/errata/ELSA-2026-89730.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:24365-1 vom 2026-10-27",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-October/030166.html"
},
{
"category": "external",
"summary": "Rocky Linux Security Advisory RLSA-2026:89730 vom 2026-10-27",
"url": "https://errata.build.resf.org/RLSA-2026:89730"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:91366 vom 2026-10-28",
"url": "https://access.redhat.com/errata/RHSA-2026:91366"
},
{
"category": "external",
"summary": "Oracle Linux Security Advisory ELSA-2026-91366 vom 2026-10-29",
"url": "http://linux.oracle.com/errata/ELSA-2026-91366.html"
},
{
"category": "external",
"summary": "Oracle Linux Security Advisory ELSA-2026-91365 vom 2026-10-30",
"url": "http://linux.oracle.com/errata/ELSA-2026-91365.html"
},
{
"category": "external",
"summary": "Rocky Linux Security Advisory RLSA-2026:91366 vom 2026-10-30",
"url": "https://errata.build.resf.org/RLSA-2026:91366"
},
{
"category": "external",
"summary": "Rocky Linux Security Advisory RLSA-2026:91365 vom 2026-10-30",
"url": "https://errata.build.resf.org/RLSA-2026:91365"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:94802 vom 2026-11-04",
"url": "https://access.redhat.com/errata/RHSA-2026:94802"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:24472-1 vom 2026-11-03",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-November/030371.html"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:95499 vom 2026-11-05",
"url": "https://access.redhat.com/errata/RHSA-2026:95499"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:95496 vom 2026-11-05",
"url": "https://access.redhat.com/errata/RHSA-2026:95496"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:95497 vom 2026-11-05",
"url": "https://access.redhat.com/errata/RHSA-2026:95497"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:95498 vom 2026-11-05",
"url": "https://access.redhat.com/errata/RHSA-2026:95498"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2026:24552-1 vom 2026-11-06",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-November/030481.html"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98427 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98427"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98432 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98432"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98431 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98431"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98439 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98439"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98434 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98434"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98430 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98430"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98441 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98441"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98429 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98429"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98423 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98423"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98440 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98440"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98437 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98437"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98436 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98436"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98438 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98438"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98435 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98435"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98461 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98461"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:98564 vom 2026-11-11",
"url": "https://access.redhat.com/errata/RHSA-2026:98564"
},
{
"category": "external",
"summary": "Rocky Linux Security Advisory RLSA-2026:98461 vom 2026-11-12",
"url": "https://errata.build.resf.org/RLSA-2026:98461"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:99566 vom 2026-11-12",
"url": "https://access.redhat.com/errata/RHSA-2026:99566"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:99565 vom 2026-11-12",
"url": "https://access.redhat.com/errata/RHSA-2026:99565"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2026:99754 vom 2026-11-12",
"url": "https://access.redhat.com/errata/RHSA-2026:99754"
}
],
"source_lang": "en-US",
"title": "X.Org X11: Schwachstelle erm\u00f6glicht Codeausf\u00fchrung",
"tracking": {
"current_release_date": "2026-11-12T23:00:00.000+00:00",
"generator": {
"date": "2026-11-13T10:38:00.603+00:00",
"engine": {
"name": "BSI-WID",
"version": "1.7.0"
}
},
"id": "WID-SEC-W-2026-3503",
"initial_release_date": "2026-09-21T22:00:00.000+00:00",
"revision_history": [
{
"date": "2026-09-21T22:00:00.000+00:00",
"number": "1",
"summary": "Initiale Fassung"
},
{
"date": "2026-09-23T22:00:00.000+00:00",
"number": "2",
"summary": "Neue Updates von openSUSE aufgenommen"
},
{
"date": "2026-09-24T22:00:00.000+00:00",
"number": "3",
"summary": "Neue Updates von openSUSE aufgenommen"
},
{
"date": "2026-09-29T22:00:00.000+00:00",
"number": "4",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2026-09-30T22:00:00.000+00:00",
"number": "5",
"summary": "Neue Updates von Fedora aufgenommen"
},
{
"date": "2026-10-01T22:00:00.000+00:00",
"number": "6",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2026-10-05T22:00:00.000+00:00",
"number": "7",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2026-10-12T22:00:00.000+00:00",
"number": "8",
"summary": "Neue Updates von Amazon und Ubuntu aufgenommen"
},
{
"date": "2026-10-25T23:00:00.000+00:00",
"number": "9",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2026-10-26T23:00:00.000+00:00",
"number": "10",
"summary": "Neue Updates von Oracle Linux und SUSE aufgenommen"
},
{
"date": "2026-10-27T23:00:00.000+00:00",
"number": "11",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2026-10-28T23:00:00.000+00:00",
"number": "12",
"summary": "Neue Updates von Oracle Linux aufgenommen"
},
{
"date": "2026-10-29T23:00:00.000+00:00",
"number": "13",
"summary": "Neue Updates von Oracle Linux aufgenommen"
},
{
"date": "2026-11-03T23:00:00.000+00:00",
"number": "14",
"summary": "Neue Updates von Red Hat und SUSE aufgenommen"
},
{
"date": "2026-11-04T23:00:00.000+00:00",
"number": "15",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2026-11-05T23:00:00.000+00:00",
"number": "16",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2026-11-10T23:00:00.000+00:00",
"number": "17",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2026-11-11T23:00:00.000+00:00",
"number": "18",
"summary": "Neue Updates von Red Hat und Rocky Enterprise Software Foundation aufgenommen"
},
{
"date": "2026-11-12T23:00:00.000+00:00",
"number": "19",
"summary": "Neue Updates von Red Hat aufgenommen"
}
],
"status": "final",
"version": "19"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"category": "product_name",
"name": "Amazon Linux 2",
"product": {
"name": "Amazon Linux 2",
"product_id": "398363",
"product_identification_helper": {
"cpe": "cpe:/o:amazon:linux_2:-"
}
}
}
],
"category": "vendor",
"name": "Amazon"
},
{
"branches": [
{
"category": "product_name",
"name": "Fedora Linux",
"product": {
"name": "Fedora Linux",
"product_id": "74178",
"product_identification_helper": {
"cpe": "cpe:/o:fedoraproject:fedora:-"
}
}
}
],
"category": "vendor",
"name": "Fedora"
},
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "\u003c1.8.14",
"product": {
"name": "Open Source X.Org X11 \u003c1.8.14",
"product_id": "T059953"
}
},
{
"category": "product_version",
"name": "1.8.14",
"product": {
"name": "Open Source X.Org X11 1.8.14",
"product_id": "T059953-fixed",
"product_identification_helper": {
"cpe": "cpe:/a:x:x.org_x11:1.8.14"
}
}
}
],
"category": "product_name",
"name": "X.Org X11"
}
],
"category": "vendor",
"name": "Open Source"
},
{
"branches": [
{
"category": "product_name",
"name": "Oracle Linux",
"product": {
"name": "Oracle Linux",
"product_id": "T056236",
"product_identification_helper": {
"cpe": "cpe:/o:oracle:linux:-"
}
}
}
],
"category": "vendor",
"name": "Oracle"
},
{
"branches": [
{
"category": "product_name",
"name": "RESF Rocky Linux",
"product": {
"name": "RESF Rocky Linux",
"product_id": "T054581",
"product_identification_helper": {
"cpe": "cpe:/o:resf:rocky_linux:-"
}
}
}
],
"category": "vendor",
"name": "RESF"
},
{
"branches": [
{
"category": "product_name",
"name": "Red Hat Enterprise Linux",
"product": {
"name": "Red Hat Enterprise Linux",
"product_id": "67646",
"product_identification_helper": {
"cpe": "cpe:/o:redhat:enterprise_linux:-"
}
}
}
],
"category": "vendor",
"name": "Red Hat"
},
{
"branches": [
{
"category": "product_name",
"name": "SUSE Linux",
"product": {
"name": "SUSE Linux",
"product_id": "T054646",
"product_identification_helper": {
"cpe": "cpe:/o:suse:suse_linux:-"
}
}
},
{
"category": "product_name",
"name": "SUSE openSUSE",
"product": {
"name": "SUSE openSUSE",
"product_id": "T055946",
"product_identification_helper": {
"cpe": "cpe:/o:suse:opensuse:-"
}
}
}
],
"category": "vendor",
"name": "SUSE"
},
{
"branches": [
{
"category": "product_name",
"name": "Ubuntu Linux",
"product": {
"name": "Ubuntu Linux",
"product_id": "T055947",
"product_identification_helper": {
"cpe": "cpe:/o:canonical:ubuntu_linux:-"
}
}
}
],
"category": "vendor",
"name": "Ubuntu"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-88806",
"product_status": {
"known_affected": [
"T056236",
"T054581",
"67646",
"T055947",
"T055946",
"74178",
"398363",
"T054646",
"T059953"
]
},
"release_date": "2026-09-21T22:00:00.000+00:00",
"title": "CVE-2026-88806"
}
]
}
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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
| 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.
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- 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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.
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.
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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.