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netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet sashiko says: If map_addr() changes the packet length, such as when the public NAT IP string is shorter or longer than the internal IP, coff will still point to the offset relative to the pre-mangled packet. If the packet shrinks, coff could overshoot the correct position, potentially causing the next ct_sip_parse_header_uri() call to silently skip bytes and miss subsequent Contact headers. Could this lead to a failure to NAT those subsequent headers and leak internal network details?

Announced Group revision 1
Original source ↗

CVE-2026-100070

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-100070

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "c978cd3a937141deaf7995b849824af6dacdeae7",
        "lessThan": "6828aca3d82717c2fda92af81c0dda642bc2b465",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c978cd3a937141deaf7995b849824af6dacdeae7",
        "lessThan": "2703f5ea8d85bc729f433ac09ee902084c947122",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c978cd3a937141deaf7995b849824af6dacdeae7",
        "lessThan": "0f4d30e2e49f343fc28ba1e259fd22969b940c46",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c978cd3a937141deaf7995b849824af6dacdeae7",
        "lessThan": "810da5a63549531da78348b0a4545042d84e01e2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c978cd3a937141deaf7995b849824af6dacdeae7",
        "lessThan": "668cc1c30caedc63070b10d17d5514748988a140",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c978cd3a937141deaf7995b849824af6dacdeae7",
        "lessThan": "e70d48fcf8382581162608a4a322919bfd22aef3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c978cd3a937141deaf7995b849824af6dacdeae7",
        "lessThan": "c408d416618ebb8a95e3097a13f3b793ea9272ee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c978cd3a937141deaf7995b849824af6dacdeae7",
        "lessThan": "16aecbe3036f6097c26b51b12e4c1cf207769690",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_nat_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": "2.6.26"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.26",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_nat_sip.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-100070

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#34770 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-100070 · Revision 1Source updated