{"api_version":"1","generated_at":"2026-04-19T01:11:33+00:00","cve":"CVE-2026-23457","urls":{"html":"https://cve.report/CVE-2026-23457","api":"https://cve.report/api/cve/CVE-2026-23457.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-23457","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-23457"},"summary":{"title":"netfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp()","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-04-03 16:16:32","updated_at":"2026-04-18 09:16:28"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/d4f17256544cc37f6534a14a27a9dec3540c2015","name":"https://git.kernel.org/stable/c/d4f17256544cc37f6534a14a27a9dec3540c2015","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ed81b6a7012485acdb9c6c80735a0b7d8e5e1873","name":"https://git.kernel.org/stable/c/ed81b6a7012485acdb9c6c80735a0b7d8e5e1873","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b75209debb9adab287b3caa982f77788c1e15027","name":"https://git.kernel.org/stable/c/b75209debb9adab287b3caa982f77788c1e15027","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/75fcaee5170e7dbbee778927134ef2e9568b4659","name":"https://git.kernel.org/stable/c/75fcaee5170e7dbbee778927134ef2e9568b4659","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/528b4509c9dfc272e2e92d811915e5211650d383","name":"https://git.kernel.org/stable/c/528b4509c9dfc272e2e92d811915e5211650d383","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fbce58e719a17aa215c724473fd5baaa4a8dc57c","name":"https://git.kernel.org/stable/c/fbce58e719a17aa215c724473fd5baaa4a8dc57c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cd1b7403ec835f8a0b3f1f7e68ac26af2cb1e42f","name":"https://git.kernel.org/stable/c/cd1b7403ec835f8a0b3f1f7e68ac26af2cb1e42f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/865dba58958c3a86786f89a501971ab0e3ec6ba9","name":"https://git.kernel.org/stable/c/865dba58958c3a86786f89a501971ab0e3ec6ba9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-23457","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23457","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da ed81b6a7012485acdb9c6c80735a0b7d8e5e1873 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da cd1b7403ec835f8a0b3f1f7e68ac26af2cb1e42f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da b75209debb9adab287b3caa982f77788c1e15027 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f5b321bd37fbec9188feb1f721ab46a5ac0b35da 528b4509c9dfc272e2e92d811915e5211650d383 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.167 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.130 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.78 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.20 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.10 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"23457","cve":"CVE-2026-23457","epss":"0.000320000","percentile":"0.090980000","score_date":"2026-04-18","updated_at":"2026-04-19 00:10:43"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/nf_conntrack_sip.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ed81b6a7012485acdb9c6c80735a0b7d8e5e1873","status":"affected","version":"f5b321bd37fbec9188feb1f721ab46a5ac0b35da","versionType":"git"},{"lessThan":"cd1b7403ec835f8a0b3f1f7e68ac26af2cb1e42f","status":"affected","version":"f5b321bd37fbec9188feb1f721ab46a5ac0b35da","versionType":"git"},{"lessThan":"b75209debb9adab287b3caa982f77788c1e15027","status":"affected","version":"f5b321bd37fbec9188feb1f721ab46a5ac0b35da","versionType":"git"},{"lessThan":"528b4509c9dfc272e2e92d811915e5211650d383","status":"affected","version":"f5b321bd37fbec9188feb1f721ab46a5ac0b35da","versionType":"git"},{"lessThan":"75fcaee5170e7dbbee778927134ef2e9568b4659","status":"affected","version":"f5b321bd37fbec9188feb1f721ab46a5ac0b35da","versionType":"git"},{"lessThan":"865dba58958c3a86786f89a501971ab0e3ec6ba9","status":"affected","version":"f5b321bd37fbec9188feb1f721ab46a5ac0b35da","versionType":"git"},{"lessThan":"d4f17256544cc37f6534a14a27a9dec3540c2015","status":"affected","version":"f5b321bd37fbec9188feb1f721ab46a5ac0b35da","versionType":"git"},{"lessThan":"fbce58e719a17aa215c724473fd5baaa4a8dc57c","status":"affected","version":"f5b321bd37fbec9188feb1f721ab46a5ac0b35da","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/nf_conntrack_sip.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.34"},{"lessThan":"2.6.34","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.130","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.78","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.20","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.167","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.130","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.78","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.20","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.10","versionStartIncluding":"2.6.34","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"2.6.34","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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"},"nvd":{"publishedDate":"2026-04-03 16:16:32","lastModifiedDate":"2026-04-18 09:16:28","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"23457","Ordinal":"1","Title":"netfilter: nf_conntrack_sip: fix Content-Length u32 truncation i","CVE":"CVE-2026-23457","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"23457","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"netfilter: nf_conntrack_sip: fix Content-Length u32 truncation i"}]}}}