{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-100070", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.456Z", "datePublished": "2026-09-25T13:06:44.311Z", "dateUpdated": "2026-09-25T13:06:44.311Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-25T13:06:44.311Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_nat_sip: rewind offset when NAT shrinks the packet\n\nsashiko says:\n If map_addr() changes the packet length, such as when the public NAT IP\n string is shorter or longer than the internal IP, coff will still point to\n the offset relative to the pre-mangled packet.\n If the packet shrinks, coff could overshoot the correct position,\n potentially causing the next ct_sip_parse_header_uri() call to silently\n skip bytes and miss subsequent Contact headers. Could this lead to a\n failure to NAT those subsequent headers and leak internal network details?"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_nat_sip.c"], "versions": [{"version": "c978cd3a937141deaf7995b849824af6dacdeae7", "lessThan": "6828aca3d82717c2fda92af81c0dda642bc2b465", "status": "affected", "versionType": "git"}, {"version": "c978cd3a937141deaf7995b849824af6dacdeae7", "lessThan": "2703f5ea8d85bc729f433ac09ee902084c947122", "status": "affected", "versionType": "git"}, {"version": "c978cd3a937141deaf7995b849824af6dacdeae7", "lessThan": "0f4d30e2e49f343fc28ba1e259fd22969b940c46", "status": "affected", "versionType": "git"}, {"version": "c978cd3a937141deaf7995b849824af6dacdeae7", "lessThan": "810da5a63549531da78348b0a4545042d84e01e2", "status": "affected", "versionType": "git"}, {"version": "c978cd3a937141deaf7995b849824af6dacdeae7", "lessThan": "668cc1c30caedc63070b10d17d5514748988a140", "status": "affected", "versionType": "git"}, {"version": "c978cd3a937141deaf7995b849824af6dacdeae7", "lessThan": "e70d48fcf8382581162608a4a322919bfd22aef3", "status": "affected", "versionType": "git"}, {"version": "c978cd3a937141deaf7995b849824af6dacdeae7", "lessThan": "c408d416618ebb8a95e3097a13f3b793ea9272ee", "status": "affected", "versionType": "git"}, {"version": "c978cd3a937141deaf7995b849824af6dacdeae7", "lessThan": "16aecbe3036f6097c26b51b12e4c1cf207769690", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_nat_sip.c"], "versions": [{"version": "2.6.26", "status": "affected"}, {"version": "0", "lessThan": "2.6.26", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6828aca3d82717c2fda92af81c0dda642bc2b465"}, {"url": "https://git.kernel.org/stable/c/2703f5ea8d85bc729f433ac09ee902084c947122"}, {"url": "https://git.kernel.org/stable/c/0f4d30e2e49f343fc28ba1e259fd22969b940c46"}, {"url": "https://git.kernel.org/stable/c/810da5a63549531da78348b0a4545042d84e01e2"}, {"url": "https://git.kernel.org/stable/c/668cc1c30caedc63070b10d17d5514748988a140"}, {"url": "https://git.kernel.org/stable/c/e70d48fcf8382581162608a4a322919bfd22aef3"}, {"url": "https://git.kernel.org/stable/c/c408d416618ebb8a95e3097a13f3b793ea9272ee"}, {"url": "https://git.kernel.org/stable/c/16aecbe3036f6097c26b51b12e4c1cf207769690"}], "title": "netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/netfilter/nf_nat_sip.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "6828aca3d82717c2fda92af81c0dda642bc2b465", "status": "affected", "version": "c978cd3a937141deaf7995b849824af6dacdeae7", "versionType": "git"}, {"lessThan": "2703f5ea8d85bc729f433ac09ee902084c947122", "status": "affected", "version": "c978cd3a937141deaf7995b849824af6dacdeae7", "versionType": "git"}, {"lessThan": "0f4d30e2e49f343fc28ba1e259fd22969b940c46", "status": "affected", "version": "c978cd3a937141deaf7995b849824af6dacdeae7", "versionType": "git"}, {"lessThan": "810da5a63549531da78348b0a4545042d84e01e2", "status": "affected", "version": "c978cd3a937141deaf7995b849824af6dacdeae7", "versionType": "git"}, {"lessThan": "668cc1c30caedc63070b10d17d5514748988a140", "status": "affected", "version": "c978cd3a937141deaf7995b849824af6dacdeae7", "versionType": "git"}, {"lessThan": "e70d48fcf8382581162608a4a322919bfd22aef3", "status": "affected", "version": "c978cd3a937141deaf7995b849824af6dacdeae7", "versionType": "git"}, {"lessThan": "c408d416618ebb8a95e3097a13f3b793ea9272ee", "status": "affected", "version": "c978cd3a937141deaf7995b849824af6dacdeae7", "versionType": "git"}, {"lessThan": "16aecbe3036f6097c26b51b12e4c1cf207769690", "status": "affected", "version": "c978cd3a937141deaf7995b849824af6dacdeae7", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/netfilter/nf_nat_sip.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.26"}, {"lessThan": "2.6.26", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_nat_sip: rewind offset when NAT shrinks the packet\n\nsashiko says:\n If map_addr() changes the packet length, such as when the public NAT IP\n string is shorter or longer than the internal IP, coff will still point to\n the offset relative to the pre-mangled packet.\n If the packet shrinks, coff could overshoot the correct position,\n potentially causing the next ct_sip_parse_header_uri() call to silently\n skip bytes and miss subsequent Contact headers. Could this lead to a\n failure to NAT those subsequent headers and leak internal network details?"}], "id": "CVE-2026-100070", "lastModified": "2026-09-30T14:10:59.253", "metrics": {}, "published": "2026-09-25T14:17:13.400", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0f4d30e2e49f343fc28ba1e259fd22969b940c46"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/16aecbe3036f6097c26b51b12e4c1cf207769690"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2703f5ea8d85bc729f433ac09ee902084c947122"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/668cc1c30caedc63070b10d17d5514748988a140"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6828aca3d82717c2fda92af81c0dda642bc2b465"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/810da5a63549531da78348b0a4545042d84e01e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c408d416618ebb8a95e3097a13f3b793ea9272ee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e70d48fcf8382581162608a4a322919bfd22aef3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet", "id": "2541421", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541421"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-212", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: nf_nat_sip: rewind offset when NAT shrinks the packet\nsashiko says:\nIf map_addr() changes the packet length, such as when the public NAT IP\nstring is shorter or longer than the internal IP, coff will still point to\nthe offset relative to the pre-mangled packet.\nIf the packet shrinks, coff could overshoot the correct position,\npotentially causing the next ct_sip_parse_header_uri() call to silently\nskip bytes and miss subsequent Contact headers. Could this lead to a\nfailure to NAT those subsequent headers and leak internal network details?", "A flaw was found in the Linux kernel. This vulnerability can result in information disclosure when processing Session Initiation Protocol (SIP) traffic through the netfilter Network Address Translation (NAT) helper. When address rewriting shortens a packet, the helper fails to adjust its internal offset, causing subsequent Contact headers to be skipped during translation. Consequently, an external recipient or network observer may receive untranslated internal IP addresses, exposing private network details."], "name": "CVE-2026-100070", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-100070\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-100070\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-100070.mbox"], "threat_severity": "Moderate"}

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