Answer in brief
CVE-2026-72348 records a Unknown severity vulnerability in netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop. 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.
Answer in brief
CVE-2026-72348 records a Unknown severity vulnerability in netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop. 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 | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f16d856b6af5fd0e7cb0b0212f70825b599ef72e || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc416870100cf16d5b9495199355a679c3a02d48 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f775fcf384b06f35b612f78fa5601fee99eb6513 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2fd89a50a9783eed8ed23866b11c8b3d8779a7a8 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3578b6d92a5b1e603ae6e8c8f5538a709f03aba4 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3d441be2b1c5e98167302fa1c7b61960a067b112 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <43ccc20b5a733226417832cf16ef45322e594990 | f16d856b6af5fd0e7cb0b0212f70825b599ef72e, fc416870100cf16d5b9495199355a679c3a02d48, f775fcf384b06f35b612f78fa5601fee99eb6513, 2fd89a50a9783eed8ed23866b11c8b3d8779a7a8, 3578b6d92a5b1e603ae6e8c8f5538a709f03aba4, 3d441be2b1c5e98167302fa1c7b61960a067b112, d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7, 43ccc20b5a733226417832cf16ef45322e594990 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop The ah, hbh and rt matches check that the fixed extension header is present, then use the header length field to derive the advertised extension header length for matching. For the ah match, add the missing advertised-length check. For hbh and rt, update the existing advertised-length checks. In all three cases, set hotdrop to true before returning false when the advertised extension header length exceeds the available skb data. Returning false treats the packet as a rule mismatch. Set hotdrop to true and drop malformed packets so they cannot bypass rules intended to drop packets with these IPv6 extension headers.
Quoted source text, attributed separately from HOL analysis.
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 | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f16d856b6af5fd0e7cb0b0212f70825b599ef72e || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc416870100cf16d5b9495199355a679c3a02d48 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f775fcf384b06f35b612f78fa5601fee99eb6513 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2fd89a50a9783eed8ed23866b11c8b3d8779a7a8 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3578b6d92a5b1e603ae6e8c8f5538a709f03aba4 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3d441be2b1c5e98167302fa1c7b61960a067b112 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <43ccc20b5a733226417832cf16ef45322e594990 | f16d856b6af5fd0e7cb0b0212f70825b599ef72e, fc416870100cf16d5b9495199355a679c3a02d48, f775fcf384b06f35b612f78fa5601fee99eb6513, 2fd89a50a9783eed8ed23866b11c8b3d8779a7a8, 3578b6d92a5b1e603ae6e8c8f5538a709f03aba4, 3d441be2b1c5e98167302fa1c7b61960a067b112, d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7, 43ccc20b5a733226417832cf16ef45322e594990 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop The ah, hbh and rt matches check that the fixed extension header is present, then use the header length field to derive the advertised extension header length for matching. For the ah match, add the missing advertised-length check. For hbh and rt, update the existing advertised-length checks. In all three cases, set hotdrop to true before returning false when the advertised extension header length exceeds the available skb data. Returning false treats the packet as a rule mismatch. Set hotdrop to true and drop malformed packets so they cannot bypass rules intended to drop packets with these IPv6 extension headers.
Quoted source text, attributed separately from HOL analysis.