CVE-2023-46838 (GCVE-0-2023-46838)

Vulnerability from cvelistv5 – Published: 2024-01-29 10:18 – Updated: 2025-11-04 18:18
VLAI?
Summary
Transmit requests in Xen's virtual network protocol can consist of multiple parts. While not really useful, except for the initial part any of them may be of zero length, i.e. carry no data at all. Besides a certain initial portion of the to be transferred data, these parts are directly translated into what Linux calls SKB fragments. Such converted request parts can, when for a particular SKB they are all of length zero, lead to a de-reference of NULL in core networking code.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
XEN
References
Impacted products
Vendor Product Version
Linux Linux Unknown: consult Xen advisory XSA-448
Create a notification for this product.
Credits
This issue was discovered by Pratyush Yadav of Amazon.
Show details on NVD website
To clipboard 

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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://xenbits.xenproject.org/xsa/advisory-448.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZFYW6R64GPLUOXSQBJI3JBUX3HGLAYPP/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGEKT4DKSDXDS34EL7M4UVJMMPH7Z3ZZ/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"http://xenbits.xen.org/xsa/advisory-448.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-04T18:18:51.507Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-46838\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-06-02T19:06:43.742416Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-06-02T19:07:28.758Z\"}}], \"cna\": {\"title\": \"Linux: netback processing of zero-length transmit fragment\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"This issue was discovered by Pratyush Yadav of Amazon.\"}], \"impacts\": [{\"descriptions\": [{\"lang\": \"en\", \"value\": \"An unprivileged guest can cause Denial of Service (DoS) of the host by\\nsending network packets to the backend, causing the backend to crash.\\n\\nData corruption or privilege escalation have not been ruled out.\"}]}], \"affected\": [{\"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"unknown\", \"version\": \"consult Xen advisory XSA-448\"}], \"defaultStatus\": \"unknown\"}], \"datePublic\": \"2024-01-22T18:30:00.000Z\", \"references\": [{\"url\": \"https://xenbits.xenproject.org/xsa/advisory-448.html\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZFYW6R64GPLUOXSQBJI3JBUX3HGLAYPP/\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGEKT4DKSDXDS34EL7M4UVJMMPH7Z3ZZ/\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Using a userspace PV network backend (e.g. the qemu based \\\"qnic\\\" backend)\\nwill mitigate the problem.\\n\\nUsing a dedicated network driver domain per guest will mitigate the\\nproblem.\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Transmit requests in Xen\u0027s virtual network protocol can consist of\\nmultiple parts.  While not really useful, except for the initial part\\nany of them may be of zero length, i.e. carry no data at all.  Besides a\\ncertain initial portion of the to be transferred data, these parts are\\ndirectly translated into what Linux calls SKB fragments.  Such converted\\nrequest parts can, when for a particular SKB they are all of length\\nzero, lead to a de-reference of NULL in core networking code.\"}], \"configurations\": [{\"lang\": \"en\", \"value\": \"All systems using a Linux based network backend with kernel 4.14 and\\nnewer are vulnerable.  Earlier versions may also be vulnerable.  Systems\\nusing other network backends are not known to be vulnerable.\"}], \"providerMetadata\": {\"orgId\": \"23aa2041-22e1-471f-9209-9b7396fa234f\", \"shortName\": \"XEN\", \"dateUpdated\": \"2024-06-27T12:06:46.609Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-46838\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-04T18:18:51.507Z\", \"dateReserved\": \"2023-10-27T07:55:35.332Z\", \"assignerOrgId\": \"23aa2041-22e1-471f-9209-9b7396fa234f\", \"datePublished\": \"2024-01-29T10:18:48.418Z\", \"assignerShortName\": \"XEN\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.