CVE-2026-72348netfilter: ip6tables: mark malformed IPv6 extension headers for hotdrop
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: 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.
- CVSS
- 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- 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
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f16d856b6af5fd0e7cb0b0212f70825b599ef72e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fc416870100cf16d5b9495199355a679c3a02d48; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f775fcf384b06f35b612f78fa5601fee99eb6513; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2fd89a50a9783eed8ed23866b11c8b3d8779a7a8; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 3578b6d92a5b1e603ae6e8c8f5538a709f03aba4; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 3d441be2b1c5e98167302fa1c7b61960a067b112; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 43ccc20b5a733226417832cf16ef45322e594990 | CNA record |
References
- https://git.kernel.org/stable/c/f16d856b6af5fd0e7cb0b0212f70825b599ef72e
- https://git.kernel.org/stable/c/fc416870100cf16d5b9495199355a679c3a02d48
- https://git.kernel.org/stable/c/f775fcf384b06f35b612f78fa5601fee99eb6513
- https://git.kernel.org/stable/c/2fd89a50a9783eed8ed23866b11c8b3d8779a7a8
- https://git.kernel.org/stable/c/3578b6d92a5b1e603ae6e8c8f5538a709f03aba4
- https://git.kernel.org/stable/c/3d441be2b1c5e98167302fa1c7b61960a067b112
- https://git.kernel.org/stable/c/d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7
- https://git.kernel.org/stable/c/43ccc20b5a733226417832cf16ef45322e594990
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.