msrc_cve-2021-20268
Vulnerability from csaf_microsoft
Published
2021-03-02 00:00
Modified
2021-03-25 00:00
Summary
An out-of-bounds access flaw was found in the Linux kernel's implementation of the eBPF code verifier in the way a user running the eBPF script calls dev_map_init_map or sock_map_alloc. This flaw allows a local user to crash the system or possibly escalate their privileges. The highest threat from this vulnerability is to confidentiality integrity as well as system availability.
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.
{
"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-2021-20268 An out-of-bounds access flaw was found in the Linux kernel\u0027s implementation of the eBPF code verifier in the way a user running the eBPF script calls dev_map_init_map or sock_map_alloc. This flaw allows a local user to crash the system or possibly escalate their privileges. The highest threat from this vulnerability is to confidentiality integrity as well as system availability. - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-20268.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": "An out-of-bounds access flaw was found in the Linux kernel\u0027s implementation of the eBPF code verifier in the way a user running the eBPF script calls dev_map_init_map or sock_map_alloc. This flaw allows a local user to crash the system or possibly escalate their privileges. The highest threat from this vulnerability is to confidentiality integrity as well as system availability.",
"tracking": {
"current_release_date": "2021-03-25T00:00:00.000Z",
"generator": {
"date": "2025-10-19T21:50:22.157Z",
"engine": {
"name": "MSRC Generator",
"version": "1.0"
}
},
"id": "msrc_CVE-2021-20268",
"initial_release_date": "2021-03-02T00:00:00.000Z",
"revision_history": [
{
"date": "2021-03-25T00:00:00.000Z",
"legacy_version": "1",
"number": "1",
"summary": "Information published."
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version",
"name": "1.0",
"product": {
"name": "CBL Mariner 1.0 x64",
"product_id": "12137"
}
},
{
"category": "product_version",
"name": "1.0",
"product": {
"name": "CBL Mariner 1.0 ARM",
"product_id": "12138"
}
}
],
"category": "product_name",
"name": "Azure Linux"
}
],
"category": "vendor",
"name": "Microsoft"
}
],
"relationships": [
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "12137-16"
},
"product_reference": "16",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "13851-12137"
},
"product_reference": "13851",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-devel-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "12137-15"
},
"product_reference": "15",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-devel-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "13852-12137"
},
"product_reference": "13852",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-drivers-accessibility-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "12137-14"
},
"product_reference": "14",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-drivers-accessibility-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "13853-12137"
},
"product_reference": "13853",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-drivers-sound-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "12137-13"
},
"product_reference": "13",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-drivers-sound-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "13854-12137"
},
"product_reference": "13854",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-docs-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "12137-12"
},
"product_reference": "12",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-docs-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "13855-12137"
},
"product_reference": "13855",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-oprofile-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "12137-11"
},
"product_reference": "11",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-oprofile-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "13856-12137"
},
"product_reference": "13856",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-tools-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "12137-10"
},
"product_reference": "10",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-tools-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "13857-12137"
},
"product_reference": "13857",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-debuginfo-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "12137-9"
},
"product_reference": "9",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-debuginfo-5.10.57.1-1.cm1.x86_64.rpm as a component of CBL Mariner 1.0 x64",
"product_id": "13858-12137"
},
"product_reference": "13858",
"relates_to_product_reference": "12137"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "12138-8"
},
"product_reference": "8",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "13859-12138"
},
"product_reference": "13859",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-devel-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "12138-7"
},
"product_reference": "7",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-devel-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "13860-12138"
},
"product_reference": "13860",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-drivers-accessibility-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "12138-6"
},
"product_reference": "6",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-drivers-accessibility-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "13861-12138"
},
"product_reference": "13861",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-drivers-sound-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "12138-5"
},
"product_reference": "5",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-drivers-sound-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "13862-12138"
},
"product_reference": "13862",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-docs-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "12138-4"
},
"product_reference": "4",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-docs-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "13863-12138"
},
"product_reference": "13863",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-tools-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "12138-3"
},
"product_reference": "3",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-tools-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "13864-12138"
},
"product_reference": "13864",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-dtb-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "12138-2"
},
"product_reference": "2",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-dtb-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "13865-12138"
},
"product_reference": "13865",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "\u003ckernel-debuginfo-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "12138-1"
},
"product_reference": "1",
"relates_to_product_reference": "12138"
},
{
"category": "default_component_of",
"full_product_name": {
"name": "kernel-debuginfo-5.10.57.1-1.cm1.aarch64.rpm as a component of CBL Mariner 1.0 ARM",
"product_id": "13866-12138"
},
"product_reference": "13866",
"relates_to_product_reference": "12138"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2021-20268",
"cwe": {
"id": "CWE-190",
"name": "Integer Overflow or Wraparound"
},
"notes": [
{
"category": "general",
"text": "redhat",
"title": "Assigning CNA"
}
],
"product_status": {
"fixed": [
"13851-12137",
"13852-12137",
"13853-12137",
"13854-12137",
"13855-12137",
"13856-12137",
"13857-12137",
"13858-12137",
"13859-12138",
"13860-12138",
"13861-12138",
"13862-12138",
"13863-12138",
"13864-12138",
"13865-12138",
"13866-12138"
],
"known_affected": [
"12137-16",
"12137-15",
"12137-14",
"12137-13",
"12137-12",
"12137-11",
"12137-10",
"12137-9",
"12138-8",
"12138-7",
"12138-6",
"12138-5",
"12138-4",
"12138-3",
"12138-2",
"12138-1"
]
},
"references": [
{
"category": "self",
"summary": "CVE-2021-20268 An out-of-bounds access flaw was found in the Linux kernel\u0027s implementation of the eBPF code verifier in the way a user running the eBPF script calls dev_map_init_map or sock_map_alloc. This flaw allows a local user to crash the system or possibly escalate their privileges. The highest threat from this vulnerability is to confidentiality integrity as well as system availability. - VEX",
"url": "https://msrc.microsoft.com/csaf/vex/2021/msrc_cve-2021-20268.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"date": "2021-03-25T00:00:00.000Z",
"details": "-:Security Update:https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade",
"product_ids": [
"12137-16",
"12137-15",
"12137-14",
"12137-13",
"12137-12",
"12137-11",
"12137-10",
"12137-9",
"12138-8",
"12138-7",
"12138-6",
"12138-5",
"12138-4",
"12138-3",
"12138-2",
"12138-1"
],
"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": [
"12137-16",
"12137-15",
"12137-14",
"12137-13",
"12137-12",
"12137-11",
"12137-10",
"12137-9",
"12138-8",
"12138-7",
"12138-6",
"12138-5",
"12138-4",
"12138-3",
"12138-2",
"12138-1"
]
}
],
"title": "An out-of-bounds access flaw was found in the Linux kernel\u0027s implementation of the eBPF code verifier in the way a user running the eBPF script calls dev_map_init_map or sock_map_alloc. This flaw allows a local user to crash the system or possibly escalate their privileges. The highest threat from this vulnerability is to confidentiality integrity as well as system availability."
}
]
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…