CVE-2026-72348
Description
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.
How to fix
- Linux Linuxf16d856b6af5fd0e7cb0b0212f70825b599ef72e, fc416870100cf16d5b9495199355a679c3a02d48, f775fcf384b06f35b612f78fa5601fee99eb6513, 2fd89a50a9783eed8ed23866b11c8b3d8779a7a8, 3578b6d92a5b1e603ae6e8c8f5538a709f03aba4, 3d441be2b1c5e98167302fa1c7b61960a067b112, d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7, 43ccc20b5a733226417832cf16ef45322e594990 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < f16d856b6af5fd0e7cb0b0212f70825b599ef72e, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < fc416870100cf16d5b9495199355a679c3a02d48, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < f775fcf384b06f35b612f78fa5601fee99eb6513, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 2fd89a50a9783eed8ed23866b11c8b3d8779a7a8, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 3578b6d92a5b1e603ae6e8c8f5538a709f03aba4, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 3d441be2b1c5e98167302fa1c7b61960a067b112, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 43ccc20b5a733226417832cf16ef45322e594990, 2.6.12 | f16d856b6af5fd0e7cb0b0212f70825b599ef72e, fc416870100cf16d5b9495199355a679c3a02d48, f775fcf384b06f35b612f78fa5601fee99eb6513, 2fd89a50a9783eed8ed23866b11c8b3d8779a7a8, 3578b6d92a5b1e603ae6e8c8f5538a709f03aba4, 3d441be2b1c5e98167302fa1c7b61960a067b112, d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7, 43ccc20b5a733226417832cf16ef45322e594990 |
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