CVE-2026-23457 (GCVE-0-2026-23457)
Vulnerability from cvelistv5
Published
2026-04-03 15:15
Modified
2026-04-18 08:59
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp() sip_help_tcp() parses the SIP Content-Length header with simple_strtoul(), which returns unsigned long, but stores the result in unsigned int clen. On 64-bit systems, values exceeding UINT_MAX are silently truncated before computing the SIP message boundary. For example, Content-Length 4294967328 (2^32 + 32) is truncated to 32, causing the parser to miscalculate where the current message ends. The loop then treats trailing data in the TCP segment as a second SIP message and processes it through the SDP parser. Fix this by changing clen to unsigned long to match the return type of simple_strtoul(), and reject Content-Length values that exceed the remaining TCP payload length.
References
Impacted products
Vendor Product Version
Linux Linux Version: f5b321bd37fbec9188feb1f721ab46a5ac0b35da
Version: f5b321bd37fbec9188feb1f721ab46a5ac0b35da
Version: f5b321bd37fbec9188feb1f721ab46a5ac0b35da
Version: f5b321bd37fbec9188feb1f721ab46a5ac0b35da
Version: f5b321bd37fbec9188feb1f721ab46a5ac0b35da
Version: f5b321bd37fbec9188feb1f721ab46a5ac0b35da
Version: f5b321bd37fbec9188feb1f721ab46a5ac0b35da
Version: f5b321bd37fbec9188feb1f721ab46a5ac0b35da
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_sip.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "2.6.34"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.1.167",
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            {
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              "version": "6.6.130",
              "versionType": "semver"
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              "version": "6.12.78",
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp()\n\nsip_help_tcp() parses the SIP Content-Length header with\nsimple_strtoul(), which returns unsigned long, but stores the result in\nunsigned int clen.  On 64-bit systems, values exceeding UINT_MAX are\nsilently truncated before computing the SIP message boundary.\n\nFor example, Content-Length 4294967328 (2^32 + 32) is truncated to 32,\ncausing the parser to miscalculate where the current message ends.  The\nloop then treats trailing data in the TCP segment as a second SIP\nmessage and processes it through the SDP parser.\n\nFix this by changing clen to unsigned long to match the return type of\nsimple_strtoul(), and reject Content-Length values that exceed the\nremaining TCP payload length."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-18T08:59:06.832Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ed81b6a7012485acdb9c6c80735a0b7d8e5e1873"
        },
        {
          "url": "https://git.kernel.org/stable/c/cd1b7403ec835f8a0b3f1f7e68ac26af2cb1e42f"
        },
        {
          "url": "https://git.kernel.org/stable/c/b75209debb9adab287b3caa982f77788c1e15027"
        },
        {
          "url": "https://git.kernel.org/stable/c/528b4509c9dfc272e2e92d811915e5211650d383"
        },
        {
          "url": "https://git.kernel.org/stable/c/75fcaee5170e7dbbee778927134ef2e9568b4659"
        },
        {
          "url": "https://git.kernel.org/stable/c/865dba58958c3a86786f89a501971ab0e3ec6ba9"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4f17256544cc37f6534a14a27a9dec3540c2015"
        },
        {
          "url": "https://git.kernel.org/stable/c/fbce58e719a17aa215c724473fd5baaa4a8dc57c"
        }
      ],
      "title": "netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23457",
    "datePublished": "2026-04-03T15:15:38.193Z",
    "dateReserved": "2026-01-13T15:37:46.020Z",
    "dateUpdated": "2026-04-18T08:59:06.832Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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