CVE-2026-100070

netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet

State: Published
Severity: Not scored
Published: Sep 25, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

Description

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?

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c978cd3a937141deaf7995b849824af6dacdeae7 to before 6828aca3d82717c2fda92af81c0dda642bc2b465Affected c978cd3a937141deaf7995b849824af6dacdeae7 to before 2703f5ea8d85bc729f433ac09ee902084c947122Affected c978cd3a937141deaf7995b849824af6dacdeae7 to before 0f4d30e2e49f343fc28ba1e259fd22969b940c46Affected c978cd3a937141deaf7995b849824af6dacdeae7 to before 810da5a63549531da78348b0a4545042d84e01e2Affected c978cd3a937141deaf7995b849824af6dacdeae7 to before 668cc1c30caedc63070b10d17d5514748988a140Affected c978cd3a937141deaf7995b849824af6dacdeae7 to before e70d48fcf8382581162608a4a322919bfd22aef3Affected c978cd3a937141deaf7995b849824af6dacdeae7 to before c408d416618ebb8a95e3097a13f3b793ea9272eeAffected c978cd3a937141deaf7995b849824af6dacdeae7 to before 16aecbe3036f6097c26b51b12e4c1cf207769690Affected
LinuxLinux	2.6.26Affected before 2.6.26Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.52 through 6.18.Not affected 7.2.6 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

c978cd3a937141deaf7995b849824af6dacdeae7 to before 6828aca3d82717c2fda92af81c0dda642bc2b465Affected
c978cd3a937141deaf7995b849824af6dacdeae7 to before 2703f5ea8d85bc729f433ac09ee902084c947122Affected
c978cd3a937141deaf7995b849824af6dacdeae7 to before 0f4d30e2e49f343fc28ba1e259fd22969b940c46Affected
c978cd3a937141deaf7995b849824af6dacdeae7 to before 810da5a63549531da78348b0a4545042d84e01e2Affected
c978cd3a937141deaf7995b849824af6dacdeae7 to before 668cc1c30caedc63070b10d17d5514748988a140Affected
c978cd3a937141deaf7995b849824af6dacdeae7 to before e70d48fcf8382581162608a4a322919bfd22aef3Affected
c978cd3a937141deaf7995b849824af6dacdeae7 to before c408d416618ebb8a95e3097a13f3b793ea9272eeAffected
c978cd3a937141deaf7995b849824af6dacdeae7 to before 16aecbe3036f6097c26b51b12e4c1cf207769690Affected

LinuxLinux

2.6.26Affected
before 2.6.26Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.52 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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