Answer in brief
CVE-2026-100070 records a Unknown severity vulnerability in netfilter: nf_nat_sip: rewind offset when NAT shrinks the packet. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c978cd3a937141deaf7995b849824af6dacdeae7 <6828aca3d82717c2fda92af81c0dda642bc2b465 || >=c978cd3a937141deaf7995b849824af6dacdeae7 <2703f5ea8d85bc729f433ac09ee902084c947122 || >=c978cd3a937141deaf7995b849824af6dacdeae7 <0f4d30e2e49f343fc28ba1e259fd22969b940c46 || >=c978cd3a937141deaf7995b849824af6dacdeae7 <810da5a63549531da78348b0a4545042d84e01e2 || >=c978cd3a937141deaf7995b849824af6dacdeae7 <668cc1c30caedc63070b10d17d5514748988a140 || >=c978cd3a937141deaf7995b849824af6dacdeae7 <e70d48fcf8382581162608a4a322919bfd22aef3 || >=c978cd3a937141deaf7995b849824af6dacdeae7 <c408d416618ebb8a95e3097a13f3b793ea9272ee || >=c978cd3a937141deaf7995b849824af6dacdeae7 <16aecbe3036f6097c26b51b12e4c1cf207769690 | 6828aca3d82717c2fda92af81c0dda642bc2b465, 2703f5ea8d85bc729f433ac09ee902084c947122, 0f4d30e2e49f343fc28ba1e259fd22969b940c46, 810da5a63549531da78348b0a4545042d84e01e2, 668cc1c30caedc63070b10d17d5514748988a140, e70d48fcf8382581162608a4a322919bfd22aef3, c408d416618ebb8a95e3097a13f3b793ea9272ee, 16aecbe3036f6097c26b51b12e4c1cf207769690 |
| Linux/Linuxgeneric | 2.6.26 | Not reported |
Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 25, 2026
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?
Quoted source text, attributed separately from HOL analysis.