gsd-2022-26362
Vulnerability from gsd
Modified
2023-12-13 01:19
Details
x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen's safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, the logic for acquiring a type reference has a race condition, whereby a safely TLB flush is issued too early and creates a window where the guest can re-establish the read/write mapping before writeability is prohibited.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2022-26362",
"description": "x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen\u0027s safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, the logic for acquiring a type reference has a race condition, whereby a safely TLB flush is issued too early and creates a window where the guest can re-establish the read/write mapping before writeability is prohibited.",
"id": "GSD-2022-26362",
"references": [
"https://www.suse.com/security/cve/CVE-2022-26362.html",
"https://www.debian.org/security/2022/dsa-5184"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
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],
"details": "x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen\u0027s safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, the logic for acquiring a type reference has a race condition, whereby a safely TLB flush is issued too early and creates a window where the guest can re-establish the read/write mapping before writeability is prohibited.",
"id": "GSD-2022-26362",
"modified": "2023-12-13T01:19:39.219385Z",
"schema_version": "1.4.0"
}
},
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"ID": "CVE-2022-26362",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "xen",
"version": {
"version_data": [
{
"version_affected": "?",
"version_value": "consult Xen advisory XSA-401"
}
]
}
}
]
},
"vendor_name": "Xen"
}
]
}
},
"configuration": {
"configuration_data": {
"description": {
"description_data": [
{
"lang": "eng",
"value": "All versions of Xen are vulnerable.\n\nOnly x86 PV guests can trigger this vulnerability.\n\nTo exploit the vulnerability, there needs to be an undue delay at just\nthe wrong moment in _get_page_type(). The degree to which an x86 PV\nguest can practically control this race condition is unknown."
}
]
}
}
},
"credit": {
"credit_data": {
"description": {
"description_data": [
{
"lang": "eng",
"value": "This issue was discovered by Jann Horn of Google Project Zero."
}
]
}
}
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}
]
},
"impact": {
"impact_data": {
"description": {
"description_data": [
{
"lang": "eng",
"value": "Malicious x86 PV guest administrators may be able to escalate privilege\nso as to control the whole system."
}
]
}
}
},
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"value": "unknown"
}
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"name": "https://xenbits.xenproject.org/xsa/advisory-401.txt",
"refsource": "MISC",
"url": "https://xenbits.xenproject.org/xsa/advisory-401.txt"
},
{
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"refsource": "CONFIRM",
"url": "http://xenbits.xen.org/xsa/advisory-401.html"
},
{
"name": "[oss-security] 20220609 Xen Security Advisory 401 v2 (CVE-2022-26362) - x86 pv: Race condition in typeref acquisition",
"refsource": "MLIST",
"url": "http://www.openwall.com/lists/oss-security/2022/06/09/3"
},
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"name": "FEDORA-2022-0142d562ca",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OH65U6FTTB5MLH5A6Q3TW7KVCGOG4MYI/"
},
{
"name": "http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.html",
"refsource": "MISC",
"url": "http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.html"
},
{
"name": "DSA-5184",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2022/dsa-5184"
},
{
"name": "FEDORA-2022-2c9f8224f8",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/"
},
{
"name": "GLSA-202208-23",
"refsource": "GENTOO",
"url": "https://security.gentoo.org/glsa/202208-23"
}
]
},
"workaround": {
"workaround_data": {
"description": {
"description_data": [
{
"lang": "eng",
"value": "Not running x86 PV guests will avoid the vulnerability."
}
]
}
}
}
},
"nvd.nist.gov": {
"configurations": {
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"nodes": [
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"children": [],
"cpe_match": [
{
"cpe23Uri": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*",
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"vulnerable": true
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"operator": "OR"
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"ID": "CVE-2022-26362"
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}
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"problemtype": {
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"references": {
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{
"name": "[oss-security] 20220609 Xen Security Advisory 401 v2 (CVE-2022-26362) - x86 pv: Race condition in typeref acquisition",
"refsource": "MLIST",
"tags": [
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],
"url": "http://www.openwall.com/lists/oss-security/2022/06/09/3"
},
{
"name": "https://xenbits.xenproject.org/xsa/advisory-401.txt",
"refsource": "MISC",
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"url": "https://xenbits.xenproject.org/xsa/advisory-401.txt"
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},
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"name": "http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.html",
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"url": "http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.html"
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]
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},
"impact": {
"baseMetricV2": {
"acInsufInfo": false,
"cvssV2": {
"accessComplexity": "MEDIUM",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 6.9,
"confidentialityImpact": "COMPLETE",
"integrityImpact": "COMPLETE",
"vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C",
"version": "2.0"
},
"exploitabilityScore": 3.4,
"impactScore": 10.0,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "MEDIUM",
"userInteractionRequired": false
},
"baseMetricV3": {
"cvssV3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.4,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 0.5,
"impactScore": 5.9
}
},
"lastModifiedDate": "2022-08-24T18:35Z",
"publishedDate": "2022-06-09T17:15Z"
}
}
}
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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.
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