CVE-2022-49699
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: filemap: Handle sibling entries in filemap_get_read_batch() If a read races with an invalidation followed by another read, it is possible for a folio to be replaced with a higher-order folio. If that happens, we'll see a sibling entry for the new folio in the next iteration of the loop. This manifests as a NULL pointer dereference while holding the RCU read lock. Handle this by simply returning. The next call will find the new folio and handle it correctly. The other ways of handling this rare race are more complex and it's just not worth it.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-02-26 07:01:44.640000
Last modified
2026-11-05 20:17:08.960000
View original CVE JSON
{
"id": "CVE-2022-49699",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-02-26T07:01:44.640",
"lastModified": "2026-11-05T20:17:08.960",
"vulnStatus": "Analyzed",
"cveTags": [],
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfilemap: Handle sibling entries in filemap_get_read_batch()\n\nIf a read races with an invalidation followed by another read, it is\npossible for a folio to be replaced with a higher-order folio. If that\nhappens, we'll see a sibling entry for the new folio in the next iteration\nof the loop. This manifests as a NULL pointer dereference while holding\nthe RCU read lock.\n\nHandle this by simply returning. The next call will find the new folio\nand handle it correctly. The other ways of handling this rare race are\nmore complex and it's just not worth it."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: filemap: Manejar entradas hermanas en filemap_get_read_batch() Si una lectura compite con una invalidación seguida de otra lectura, es posible que un folio sea reemplazado por un folio de orden superior. Si eso sucede, veremos una entrada hermana para el nuevo folio en la siguiente iteración del bucle. Esto se manifiesta como una desreferencia de puntero NULL mientras se mantiene el bloqueo de lectura de RCU. Gestiona esto simplemente regresando. La siguiente llamada encontrará el nuevo folio y lo manejará correctamente. Las otras formas de gestionar esta rara ejecución son más complejas y simplemente no vale la pena."
}
],
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"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
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"id": "CVE-2022-49699",
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"weaknesses": [
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"source": "[email protected]",
"type": "Primary",
"description": [
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"value": "CWE-476"
}
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