CVE-2026-100070netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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?
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Undergoing Analysis
- Record last updated
- Sep 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from c978cd3a937141deaf7995b849824af6dacdeae7 before 6828aca3d82717c2fda92af81c0dda642bc2b465; from c978cd3a937141deaf7995b849824af6dacdeae7 before 2703f5ea8d85bc729f433ac09ee902084c947122; from c978cd3a937141deaf7995b849824af6dacdeae7 before 0f4d30e2e49f343fc28ba1e259fd22969b940c46; from c978cd3a937141deaf7995b849824af6dacdeae7 before 810da5a63549531da78348b0a4545042d84e01e2; from c978cd3a937141deaf7995b849824af6dacdeae7 before 668cc1c30caedc63070b10d17d5514748988a140; from c978cd3a937141deaf7995b849824af6dacdeae7 before e70d48fcf8382581162608a4a322919bfd22aef3; from c978cd3a937141deaf7995b849824af6dacdeae7 before c408d416618ebb8a95e3097a13f3b793ea9272ee; from c978cd3a937141deaf7995b849824af6dacdeae7 before 16aecbe3036f6097c26b51b12e4c1cf207769690 | CNA record |
References
- https://git.kernel.org/stable/c/6828aca3d82717c2fda92af81c0dda642bc2b465
- https://git.kernel.org/stable/c/2703f5ea8d85bc729f433ac09ee902084c947122
- https://git.kernel.org/stable/c/0f4d30e2e49f343fc28ba1e259fd22969b940c46
- https://git.kernel.org/stable/c/810da5a63549531da78348b0a4545042d84e01e2
- https://git.kernel.org/stable/c/668cc1c30caedc63070b10d17d5514748988a140
- https://git.kernel.org/stable/c/e70d48fcf8382581162608a4a322919bfd22aef3
- https://git.kernel.org/stable/c/c408d416618ebb8a95e3097a13f3b793ea9272ee
- https://git.kernel.org/stable/c/16aecbe3036f6097c26b51b12e4c1cf207769690
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.