fkie_cve-2022-33745
Vulnerability from fkie_nvd
Published
2022-07-26 13:15
Modified
2024-11-21 07:08
Severity ?
Summary
insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was moved inside a function in Xen. This code movement missed a variable changing meaning / value between old and new code positions. The now wrong use of the variable did lead to a wrong TLB flush condition, omitting flushes where such are necessary.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| xen | xen | * | |
| debian | debian_linux | 11.0 | |
| fedoraproject | fedora | 35 | |
| fedoraproject | fedora | 36 |
{
"configurations": [
{
"nodes": [
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"criteria": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*",
"matchCriteriaId": "EF4E17C2-244F-4E5A-A5F8-4626CD1AC11A",
"vulnerable": true
}
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"negate": false,
"operator": "OR"
}
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},
{
"nodes": [
{
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"vulnerable": true
},
{
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was moved inside a function in Xen. This code movement missed a variable changing meaning / value between old and new code positions. The now wrong use of the variable did lead to a wrong TLB flush condition, omitting flushes where such are necessary."
},
{
"lang": "es",
"value": "Un vaciado insuficiente del TLB para hu\u00e9spedes x86 PV en modo de sombra Para la migraci\u00f3n, as\u00ed como para trabajar en torno a los kernels que no son conscientes de L1TF (v\u00e9ase XSA-273), los hu\u00e9spedes PV pueden ejecutarse en modo de paginaci\u00f3n de sombra. Para abordar XSA-401, el c\u00f3digo fue movido dentro de una funci\u00f3n en Xen. Este movimiento de c\u00f3digo pas\u00f3 por alto una variable que cambiaba de significado/valor entre las posiciones de c\u00f3digo antiguas y nuevas. El uso ahora err\u00f3neo de la variable conllevaba a una condici\u00f3n err\u00f3nea de vaciado de la TLB, omitiendo el vaciado cuando era necesario."
}
],
"id": "CVE-2022-33745",
"lastModified": "2024-11-21T07:08:27.353",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.0,
"impactScore": 6.0,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2022-07-26T13:15:10.003",
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{
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"url": "https://xenbits.xenproject.org/xsa/advisory-408.txt"
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},
{
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"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MYI3OMJ7RIZNL3C6GUWNANNPEUUID6FM/"
},
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"tags": [
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],
"url": "https://xenbits.xenproject.org/xsa/advisory-408.txt"
}
],
"sourceIdentifier": "security@xen.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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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.
- 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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