CVE-2023-52527 (GCVE-0-2023-52527)

Vulnerability from cvelistv5 – Published: 2024-03-02 21:52 – Updated: 2025-05-04 07:38
VLAI?
Title
ipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data()
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv4, ipv6: Fix handling of transhdrlen in __ip{,6}_append_data() Including the transhdrlen in length is a problem when the packet is partially filled (e.g. something like send(MSG_MORE) happened previously) when appending to an IPv4 or IPv6 packet as we don't want to repeat the transport header or account for it twice. This can happen under some circumstances, such as splicing into an L2TP socket. The symptom observed is a warning in __ip6_append_data(): WARNING: CPU: 1 PID: 5042 at net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800 that occurs when MSG_SPLICE_PAGES is used to append more data to an already partially occupied skbuff. The warning occurs when 'copy' is larger than the amount of data in the message iterator. This is because the requested length includes the transport header length when it shouldn't. This can be triggered by, for example: sfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_L2TP); bind(sfd, ...); // ::1 connect(sfd, ...); // ::1 port 7 send(sfd, buffer, 4100, MSG_MORE); sendfile(sfd, dfd, NULL, 1024); Fix this by only adding transhdrlen into the length if the write queue is empty in l2tp_ip6_sendmsg(), analogously to how UDP does things. l2tp_ip_sendmsg() looks like it won't suffer from this problem as it builds the UDP packet itself.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a32e0eec7042b21ccb52896cf715e3e2641fed93 , < 7626b9fed53092aa2147978070e610ecb61af844 (git)
Affected: a32e0eec7042b21ccb52896cf715e3e2641fed93 , < 559d697c5d072593d22b3e0bd8b8081108aeaf59 (git)
Affected: a32e0eec7042b21ccb52896cf715e3e2641fed93 , < 1fc793d68d50dee4782ef2e808913d5dd880bcc6 (git)
Affected: a32e0eec7042b21ccb52896cf715e3e2641fed93 , < 96b2e1090397217839fcd6c9b6d8f5d439e705ed (git)
Affected: a32e0eec7042b21ccb52896cf715e3e2641fed93 , < cd1189956393bf850b2e275e37411855d3bd86bb (git)
Affected: a32e0eec7042b21ccb52896cf715e3e2641fed93 , < f6a7182179c0ed788e3755ee2ed18c888ddcc33f (git)
Affected: a32e0eec7042b21ccb52896cf715e3e2641fed93 , < fe80658c08e3001c80c5533cd41abfbb0e0e28fd (git)
Affected: a32e0eec7042b21ccb52896cf715e3e2641fed93 , < 9d4c75800f61e5d75c1659ba201b6c0c7ead3070 (git)
Create a notification for this product.
    Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 4.14.327 , ≤ 4.14.* (semver)
Unaffected: 4.19.296 , ≤ 4.19.* (semver)
Unaffected: 5.4.258 , ≤ 5.4.* (semver)
Unaffected: 5.10.198 , ≤ 5.10.* (semver)
Unaffected: 5.15.135 , ≤ 5.15.* (semver)
Unaffected: 6.1.57 , ≤ 6.1.* (semver)
Unaffected: 6.5.7 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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previously)\\nwhen appending to an IPv4 or IPv6 packet as we don\u0027t want to repeat the\\ntransport header or account for it twice.  This can happen under some\\ncircumstances, such as splicing into an L2TP socket.\\n\\nThe symptom observed is a warning in __ip6_append_data():\\n\\n    WARNING: CPU: 1 PID: 5042 at net/ipv6/ip6_output.c:1800 __ip6_append_data.isra.0+0x1be8/0x47f0 net/ipv6/ip6_output.c:1800\\n\\nthat occurs when MSG_SPLICE_PAGES is used to append more data to an already\\npartially occupied skbuff.  The warning occurs when \u0027copy\u0027 is larger than\\nthe amount of data in the message iterator.  This is because the requested\\nlength includes the transport header length when it shouldn\u0027t.  This can be\\ntriggered by, for example:\\n\\n        sfd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_L2TP);\\n        bind(sfd, ...); // ::1\\n        connect(sfd, ...); // ::1 port 7\\n        send(sfd, buffer, 4100, MSG_MORE);\\n        sendfile(sfd, dfd, NULL, 1024);\\n\\nFix this by only adding transhdrlen into the length if the write queue is\\nempty in l2tp_ip6_sendmsg(), analogously to how UDP does things.\\n\\nl2tp_ip_sendmsg() looks like it won\u0027t suffer from this problem as it builds\\nthe UDP packet itself.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.327\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.296\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.258\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.198\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.135\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.57\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5.7\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6\", \"versionStartIncluding\": \"3.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:38:37.636Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52527\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:38:37.636Z\", \"dateReserved\": \"2024-02-20T12:30:33.318Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-02T21:52:32.890Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.