CVE-2024-26752 (GCVE-0-2024-26752)

Vulnerability from cvelistv5 – Published: 2024-04-03 17:00 – Updated: 2025-05-04 12:54
VLAI?
Title
l2tp: pass correct message length to ip6_append_data
Summary
In the Linux kernel, the following vulnerability has been resolved: l2tp: pass correct message length to ip6_append_data l2tp_ip6_sendmsg needs to avoid accounting for the transport header twice when splicing more data into an already partially-occupied skbuff. To manage this, we check whether the skbuff contains data using skb_queue_empty when deciding how much data to append using ip6_append_data. However, the code which performed the calculation was incorrect: ulen = len + skb_queue_empty(&sk->sk_write_queue) ? transhdrlen : 0; ...due to C operator precedence, this ends up setting ulen to transhdrlen for messages with a non-zero length, which results in corrupted packets on the wire. Add parentheses to correct the calculation in line with the original intent.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 559d697c5d072593d22b3e0bd8b8081108aeaf59 , < 4c3ce64bc9d36ca9164dd6c77ff144c121011aae (git)
Affected: 1fc793d68d50dee4782ef2e808913d5dd880bcc6 , < c1d3a84a67db910ce28a871273c992c3d7f9efb5 (git)
Affected: 96b2e1090397217839fcd6c9b6d8f5d439e705ed , < dcb4d14268595065c85dc5528056713928e17243 (git)
Affected: cd1189956393bf850b2e275e37411855d3bd86bb , < 0da15a70395182ee8cb75716baf00dddc0bea38d (git)
Affected: f6a7182179c0ed788e3755ee2ed18c888ddcc33f , < 13cd1daeea848614e585b2c6ecc11ca9c8ab2500 (git)
Affected: 9d4c75800f61e5d75c1659ba201b6c0c7ead3070 , < 804bd8650a3a2bf3432375f8c97d5049d845ce56 (git)
Affected: 9d4c75800f61e5d75c1659ba201b6c0c7ead3070 , < 83340c66b498e49353530e41542500fc8a4782d6 (git)
Affected: 9d4c75800f61e5d75c1659ba201b6c0c7ead3070 , < 359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79 (git)
Affected: 7626b9fed53092aa2147978070e610ecb61af844 (git)
Affected: fe80658c08e3001c80c5533cd41abfbb0e0e28fd (git)
Create a notification for this product.
    Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 4.19.308 , ≤ 4.19.* (semver)
Unaffected: 5.4.270 , ≤ 5.4.* (semver)
Unaffected: 5.10.211 , ≤ 5.10.* (semver)
Unaffected: 5.15.150 , ≤ 5.15.* (semver)
Unaffected: 6.1.80 , ≤ 6.1.* (semver)
Unaffected: 6.6.19 , ≤ 6.6.* (semver)
Unaffected: 6.7.7 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"https://git.kernel.org/stable/c/359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nl2tp: pass correct message length to ip6_append_data\\n\\nl2tp_ip6_sendmsg needs to avoid accounting for the transport header\\ntwice when splicing more data into an already partially-occupied skbuff.\\n\\nTo manage this, we check whether the skbuff contains data using\\nskb_queue_empty when deciding how much data to append using\\nip6_append_data.\\n\\nHowever, the code which performed the calculation was incorrect:\\n\\n     ulen = len + skb_queue_empty(\u0026sk-\u003esk_write_queue) ? transhdrlen : 0;\\n\\n...due to C operator precedence, this ends up setting ulen to\\ntranshdrlen for messages with a non-zero length, which results in\\ncorrupted packets on the wire.\\n\\nAdd parentheses to correct the calculation in line with the original\\nintent.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.308\", \"versionStartIncluding\": \"4.19.296\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.270\", \"versionStartIncluding\": \"5.4.258\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.211\", \"versionStartIncluding\": \"5.10.198\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.150\", \"versionStartIncluding\": \"5.15.135\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.80\", \"versionStartIncluding\": \"6.1.57\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.19\", \"versionStartIncluding\": \"6.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.7\", \"versionStartIncluding\": \"6.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"6.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.327\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.5.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:54:40.861Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26752\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:54:40.861Z\", \"dateReserved\": \"2024-02-19T14:20:24.169Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-03T17:00:37.340Z\", \"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.