netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-100070
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 14:17:13 UTC
Updated2026-09-25 14:17:13 UTC
DescriptionIn 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?

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c978cd3a937141deaf7995b849824af6dacdeae7 6828aca3d82717c2fda92af81c0dda642bc2b465 git Not specified
CNA Linux Linux affected c978cd3a937141deaf7995b849824af6dacdeae7 2703f5ea8d85bc729f433ac09ee902084c947122 git Not specified
CNA Linux Linux affected c978cd3a937141deaf7995b849824af6dacdeae7 0f4d30e2e49f343fc28ba1e259fd22969b940c46 git Not specified
CNA Linux Linux affected c978cd3a937141deaf7995b849824af6dacdeae7 810da5a63549531da78348b0a4545042d84e01e2 git Not specified
CNA Linux Linux affected c978cd3a937141deaf7995b849824af6dacdeae7 668cc1c30caedc63070b10d17d5514748988a140 git Not specified
CNA Linux Linux affected c978cd3a937141deaf7995b849824af6dacdeae7 e70d48fcf8382581162608a4a322919bfd22aef3 git Not specified
CNA Linux Linux affected c978cd3a937141deaf7995b849824af6dacdeae7 c408d416618ebb8a95e3097a13f3b793ea9272ee git Not specified
CNA Linux Linux affected c978cd3a937141deaf7995b849824af6dacdeae7 16aecbe3036f6097c26b51b12e4c1cf207769690 git Not specified
CNA Linux Linux affected 2.6.26 Not specified
CNA Linux Linux unaffected 2.6.26 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e70d48fcf8382581162608a4a322919bfd22aef3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c408d416618ebb8a95e3097a13f3b793ea9272ee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f4d30e2e49f343fc28ba1e259fd22969b940c46 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/810da5a63549531da78348b0a4545042d84e01e2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6828aca3d82717c2fda92af81c0dda642bc2b465 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/668cc1c30caedc63070b10d17d5514748988a140 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/16aecbe3036f6097c26b51b12e4c1cf207769690 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2703f5ea8d85bc729f433ac09ee902084c947122 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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