CVE-2026-23457 (GCVE-0-2026-23457)
Vulnerability from cvelistv5
Published
2026-04-03 15:15
Modified
2026-10-19 18:35
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
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": "{\"adp\": [{\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.5\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-082556.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-457936.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-10-15T01:15:20.377Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-23457\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:08:27.615597Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-190\", \"description\": \"CWE-190 Integer Overflow or Wraparound\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:08:28.278Z\"}}], \"cna\": {\"title\": \"netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.6, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:N - The vulnerable parser is reached by TCP SIP packets processed by the in-kernel netfilter SIP conntrack helper on a firewall/NAT/SIP gateway. In a reasonable SIP ALG deployment, a remote peer can deliver the crafted SIP payload over the network.\\nAC:L - The attacker controls the SIP TCP stream contents, including the oversized Content-Length and trailing data that is reinterpreted as another SIP/SDP message. No race or condition outside the attacker\u0027s control is required once the helper is active.\\nPR:N - A remote SIP peer does not need local credentials or kernel privileges to send packets through an already configured SIP conntrack helper. Although local CAP_NET_ADMIN can configure helpers, the highest reasonable deployment is a network-facing SIP gateway where the attacker only sends traffic.\\nUI:N - No victim user action is needed after the SIP helper is deployed. The crafted TCP payload is processed automatically on packet traversal.\\nS:U - The affected logic is kernel netfilter conntrack/NAT state within the same security authority. This is not a VM escape, IOMMU bypass, or other cross-scope boundary break.\\nC:L - The bug does not expose kernel memory, but smuggled SDP can create unintended SIP media expectations that may allow limited otherwise-blocked traffic to protected endpoints. That can expose limited traffic or service responses behind the firewall.\\nI:L - The primary impact is limited integrity loss in conntrack/NAT policy state: attacker-controlled trailing bytes can be processed as a separate SIP/SDP message and create or alter expectations. This is not arbitrary kernel memory write or code execution.\\nA:H - Crafted traffic can repeatedly drive incorrect SIP helper parsing, packet drops, NAT mangling, and expectation-state pollution for affected SIP flows. In a SIP gateway scenario this can deny call or media setup through the affected subsystem.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"f5b321bd37fbec9188feb1f721ab46a5ac0b35da\", \"lessThan\": \"ed81b6a7012485acdb9c6c80735a0b7d8e5e1873\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5b321bd37fbec9188feb1f721ab46a5ac0b35da\", \"lessThan\": \"cd1b7403ec835f8a0b3f1f7e68ac26af2cb1e42f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5b321bd37fbec9188feb1f721ab46a5ac0b35da\", \"lessThan\": \"b75209debb9adab287b3caa982f77788c1e15027\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5b321bd37fbec9188feb1f721ab46a5ac0b35da\", \"lessThan\": \"528b4509c9dfc272e2e92d811915e5211650d383\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5b321bd37fbec9188feb1f721ab46a5ac0b35da\", \"lessThan\": \"75fcaee5170e7dbbee778927134ef2e9568b4659\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5b321bd37fbec9188feb1f721ab46a5ac0b35da\", \"lessThan\": \"865dba58958c3a86786f89a501971ab0e3ec6ba9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5b321bd37fbec9188feb1f721ab46a5ac0b35da\", \"lessThan\": \"d4f17256544cc37f6534a14a27a9dec3540c2015\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f5b321bd37fbec9188feb1f721ab46a5ac0b35da\", \"lessThan\": \"fbce58e719a17aa215c724473fd5baaa4a8dc57c\", \"versionType\": \"git\"}], \"programFiles\": [\"net/netfilter/nf_conntrack_sip.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.34\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.34\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.253\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.203\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.167\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.130\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.78\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.20\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/nf_conntrack_sip.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.253\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.203\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.167\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.130\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.78\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.20\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.10\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"2.6.34\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:21:56.236Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23457\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T18:35:44.867Z\", \"dateReserved\": \"2026-01-13T15:37:46.020Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-04-03T15:15:38.193Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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