fkie_cve-2021-47183
Vulnerability from fkie_nvd
Published
2024-04-10 19:15
Modified
2025-01-27 15:03
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
scsi: lpfc: Fix link down processing to address NULL pointer dereference
If an FC link down transition while PLOGIs are outstanding to fabric well
known addresses, outstanding ABTS requests may result in a NULL pointer
dereference. Driver unload requests may hang with repeated "2878" log
messages.
The Link down processing results in ABTS requests for outstanding ELS
requests. The Abort WQEs are sent for the ELSs before the driver had set
the link state to down. Thus the driver is sending the Abort with the
expectation that an ABTS will be sent on the wire. The Abort request is
stalled waiting for the link to come up. In some conditions the driver may
auto-complete the ELSs thus if the link does come up, the Abort completions
may reference an invalid structure.
Fix by ensuring that Abort set the flag to avoid link traffic if issued due
to conditions where the link failed.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * |
{
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"versionEndExcluding": "5.15.5",
"vulnerable": true
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: lpfc: Fix link down processing to address NULL pointer dereference\n\nIf an FC link down transition while PLOGIs are outstanding to fabric well\nknown addresses, outstanding ABTS requests may result in a NULL pointer\ndereference. Driver unload requests may hang with repeated \"2878\" log\nmessages.\n\nThe Link down processing results in ABTS requests for outstanding ELS\nrequests. The Abort WQEs are sent for the ELSs before the driver had set\nthe link state to down. Thus the driver is sending the Abort with the\nexpectation that an ABTS will be sent on the wire. The Abort request is\nstalled waiting for the link to come up. In some conditions the driver may\nauto-complete the ELSs thus if the link does come up, the Abort completions\nmay reference an invalid structure.\n\nFix by ensuring that Abort set the flag to avoid link traffic if issued due\nto conditions where the link failed."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: lpfc: Se soluciona el procesamiento de enlace inactivo para abordar la desreferencia de puntero NULL Si una transici\u00f3n de enlace inactivo FC mientras hay PLOGI pendientes para direcciones conocidas de Fabric, las solicitudes ABTS pendientes pueden resultar en una desreferencia de puntero NULL. Las solicitudes de descarga del controlador pueden bloquearse con mensajes de registro \"2878\" repetidos. El procesamiento de enlace inactivo da como resultado solicitudes ABTS para solicitudes ELS pendientes. Los WQE de cancelaci\u00f3n se env\u00edan para los ELS antes de que el controlador haya establecido el estado del enlace en inactivo. Por lo tanto, el controlador env\u00eda la cancelaci\u00f3n con la expectativa de que se env\u00ede una ABTS en el cable. La solicitud de cancelaci\u00f3n se detiene esperando que se active el enlace. En algunas condiciones, el controlador puede completar autom\u00e1ticamente los ELS, por lo que si el enlace se activa, las finalizaciones de cancelaci\u00f3n pueden hacer referencia a una estructura no v\u00e1lida. Se soluciona asegur\u00e1ndose de que la cancelaci\u00f3n establezca el indicador para evitar el tr\u00e1fico de enlace si se emite debido a condiciones en las que el enlace fall\u00f3."
}
],
"id": "CVE-2021-47183",
"lastModified": "2025-01-27T15:03:17.013",
"metrics": {
"cvssMetricV31": [
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"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2024-04-10T19:15:47.287",
"references": [
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"tags": [
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"url": "https://git.kernel.org/stable/c/1854f53ccd88ad4e7568ddfafafffe71f1ceb0a6"
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"url": "https://git.kernel.org/stable/c/1854f53ccd88ad4e7568ddfafafffe71f1ceb0a6"
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"tags": [
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"url": "https://git.kernel.org/stable/c/28de48a7cea495ab48082d9ff4ef63f7cb4e563a"
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
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"description": [
{
"lang": "en",
"value": "CWE-476"
}
],
"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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