fkie_cve-2024-56638
Vulnerability from fkie_nvd
Published
2024-12-27 15:15
Modified
2024-12-27 15:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_inner: incorrect percpu area handling under softirq Softirq can interrupt ongoing packet from process context that is walking over the percpu area that contains inner header offsets. Disable bh and perform three checks before restoring the percpu inner header offsets to validate that the percpu area is valid for this skbuff: 1) If the NFT_PKTINFO_INNER_FULL flag is set on, then this skbuff has already been parsed before for inner header fetching to register. 2) Validate that the percpu area refers to this skbuff using the skbuff pointer as a cookie. If there is a cookie mismatch, then this skbuff needs to be parsed again. 3) Finally, validate if the percpu area refers to this tunnel type. Only after these three checks the percpu area is restored to a on-stack copy and bh is enabled again. After inner header fetching, the on-stack copy is stored back to the percpu area.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53c7314208c865086d78b4e88da53bc33da0b603
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7b1d83da254be3bf054965c8f3b1ad976f460ae5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da5cc778e7bf78fe525bc90ec2043f41415c31d9
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_inner: incorrect percpu area handling under softirq\n\nSoftirq can interrupt ongoing packet from process context that is\nwalking over the percpu area that contains inner header offsets.\n\nDisable bh and perform three checks before restoring the percpu inner\nheader offsets to validate that the percpu area is valid for this\nskbuff:\n\n1) If the NFT_PKTINFO_INNER_FULL flag is set on, then this skbuff\n   has already been parsed before for inner header fetching to\n   register.\n\n2) Validate that the percpu area refers to this skbuff using the\n   skbuff pointer as a cookie. If there is a cookie mismatch, then\n   this skbuff needs to be parsed again.\n\n3) Finally, validate if the percpu area refers to this tunnel type.\n\nOnly after these three checks the percpu area is restored to a on-stack\ncopy and bh is enabled again.\n\nAfter inner header fetching, the on-stack copy is stored back to the\npercpu area."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nft_inner: gesti\u00f3n incorrecto del \u00e1rea percpu bajo softirq Softirq puede interrumpir el paquete en curso del contexto del proceso que recorre el \u00e1rea percpu que contiene desplazamientos de encabezado interno. Deshabilite bh y realice tres comprobaciones antes de restaurar los desplazamientos de encabezado interno percpu para validar que el \u00e1rea percpu sea v\u00e1lida para este skbuff: 1) Si el indicador NFT_PKTINFO_INNER_FULL est\u00e1 activado, este skbuff ya se ha analizado antes para que la obtenci\u00f3n del encabezado interno se registre. 2) Valide que el \u00e1rea percpu haga referencia a este skbuff usando el puntero skbuff como una cookie. Si hay una discrepancia de cookies, este skbuff debe analizarse nuevamente. 3) Finalmente, valide si el \u00e1rea percpu hace referencia a este tipo de t\u00fanel. Solo despu\u00e9s de estas tres comprobaciones, el \u00e1rea percpu se restaura a una copia en la pila y bh se habilita nuevamente. Despu\u00e9s de obtener el encabezado interno, la copia en la pila se almacena nuevamente en el \u00e1rea perCPU."
    }
  ],
  "id": "CVE-2024-56638",
  "lastModified": "2024-12-27T15:15:23.527",
  "metrics": {},
  "published": "2024-12-27T15:15:23.527",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/53c7314208c865086d78b4e88da53bc33da0b603"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7b1d83da254be3bf054965c8f3b1ad976f460ae5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da5cc778e7bf78fe525bc90ec2043f41415c31d9"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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