MSRC_CVE-2026-34001
Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-05-06 14:44Summary
Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
7.8 (High)
Affected products
Fixed
2 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 21247-17084 | — | ||
| Unresolved product id: 21316-17084 | — |
References
| URL | Category | |
|---|---|---|
{
"document": {
"category": "csaf_vex",
"csaf_version": "2.0",
"distribution": {
"text": "Public",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en-US",
"notes": [
{
"category": "general",
"text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
"title": "Additional Resources"
},
{
"category": "legal_disclaimer",
"text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
"title": "Disclaimer"
}
],
"publisher": {
"category": "vendor",
"contact_details": "secure@microsoft.com",
"name": "Microsoft Security Response Center",
"namespace": "https://msrc.microsoft.com"
},
"references": [
{
"category": "self",
"summary": "CVE-2026-34001 Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-34001.json"
},
{
"category": "external",
"summary": "Microsoft Support Lifecycle",
"url": "https://support.microsoft.com/lifecycle"
},
{
"category": "external",
"summary": "Common Vulnerability Scoring System",
"url": "https://www.first.org/cvss"
}
],
"title": "Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption",
"tracking": {
"current_release_date": "2026-05-06T14:44:03.000Z",
"generator": {
"date": "2026-05-07T08:29:04.885Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2026-34001",
"initial_release_date": "2026-04-02T00:00:00.000Z",
"revision_history": [
{
"date": "2026-04-29T01:11:22.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
},
{
"date": "2026-05-06T01:42:06.000Z",
"legacy_version": "2",
"number": "2",
"summary": "Information published."
},
{
"date": "2026-05-06T14:44:03.000Z",
"legacy_version": "3",
"number": "3",
"summary": "Information published."
}
],
"status": "final",
"version": "3"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version",
"name": "2.0",
"product": {
"name": "CBL Mariner 2.0",
"product_id": "17086"
}
},
{
"category": "product_version",
"name": "3.0",
"product": {
"name": "Azure Linux 3.0",
"product_id": "17084"
}
}
],
"category": "product_name",
"name": "Azure Linux"
},
{
"branches": [
{
"category": "product_version_range",
"name": "cbl2 xorg-x11-server 0:1.20.10-16.cbl2",
"product": {
"name": "cbl2 xorg-x11-server 0:1.20.10-16.cbl2",
"product_id": "3"
}
}
],
"category": "product_name",
"name": "xorg-x11-server"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003cazl3 xorg-x11-server-Xwayland 0:24.1.6-3.azl3",
"product": {
"name": "\u003cazl3 xorg-x11-server-Xwayland 0:24.1.6-3.azl3",
"product_id": "2"
}
},
{
"category": "product_version",
"name": "azl3 xorg-x11-server-Xwayland 0:24.1.6-3.azl3",
"product": {
"name": "azl3 xorg-x11-server-Xwayland 0:24.1.6-3.azl3",
"product_id": "21247"
}
},
{
"category": "product_version_range",
"name": "\u003cazl3 xorg-x11-server-Xwayland 0:24.1.6-4.azl3",
"product": {
"name": "\u003cazl3 xorg-x11-server-Xwayland 0:24.1.6-4.azl3",
"product_id": "1"
}
},
{
"category": "product_version",
"name": "azl3 xorg-x11-server-Xwayland 0:24.1.6-4.azl3",
"product": {
"name": "azl3 xorg-x11-server-Xwayland 0:24.1.6-4.azl3",
"product_id": "21316"
}
}
],
"category": "product_name",
"name": "xorg-x11-server-Xwayland"
}
],
"category": "vendor",
"name": "Microsoft"
}
],
"relationships": [
{
"category": "default_component_of",
"full_product_name": {
"name": "cbl2 xorg-x11-server 0:1.20.10-16.cbl2 as a component of CBL Mariner 2.0",
"product_id": "17086-3"
},
"product_reference": "3",
"relates_to_product_reference": "17086"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003cazl3 xorg-x11-server-Xwayland 0:24.1.6-3.azl3 as a component of Azure Linux 3.0",
"product_id": "17084-2"
},
"product_reference": "2",
"relates_to_product_reference": "17084"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "azl3 xorg-x11-server-Xwayland 0:24.1.6-3.azl3 as a component of Azure Linux 3.0",
"product_id": "21247-17084"
},
"product_reference": "21247",
"relates_to_product_reference": "17084"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003cazl3 xorg-x11-server-Xwayland 0:24.1.6-4.azl3 as a component of Azure Linux 3.0",
"product_id": "17084-1"
},
"product_reference": "1",
"relates_to_product_reference": "17084"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "azl3 xorg-x11-server-Xwayland 0:24.1.6-4.azl3 as a component of Azure Linux 3.0",
"product_id": "21316-17084"
},
"product_reference": "21316",
"relates_to_product_reference": "17084"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-34001",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"notes": [
{
"category": "general",
"text": "redhat",
"title": "Assigning CNA"
}
],
"product_status": {
"fixed": [
"21247-17084",
"21316-17084"
],
"known_affected": [
"17086-3",
"17084-2",
"17084-1"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2026-34001 Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-34001.json"
}
],
"remediations": [
{
"category": "none_available",
"date": "2026-04-29T01:11:22.000Z",
"details": "There is no fix available for this vulnerability as of now",
"product_ids": [
"17086-3"
]
},
{
"category": "vendor_fix",
"date": "2026-04-29T01:11:22.000Z",
"details": "0:24.1.6-4.azl3:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
"product_ids": [
"17084-2",
"17084-1"
],
"url": "https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"environmentalsScore": 0.0,
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"temporalScore": 7.8,
"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"
},
"products": [
"17086-3",
"17084-2",
"17084-1"
]
}
],
"title": "Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption"
}
]
}
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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.
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