CVE-2026-72348
Linux kernel vulnerability
- Published15 Aug 2026
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.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NRemediation
No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.
References
- 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/43ccc20b5a733226417832cf16ef45322e594990
- https://git.kernel.org/stable/c/d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7
- https://git.kernel.org/stable/c/f16d856b6af5fd0e7cb0b0212f70825b599ef72e
- https://git.kernel.org/stable/c/f775fcf384b06f35b612f78fa5601fee99eb6513
- https://git.kernel.org/stable/c/fc416870100cf16d5b9495199355a679c3a02d48
Frequently asked
Is CVE-2026-72348 being actively exploited?
CVE-2026-72348 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.63%.
How severe is CVE-2026-72348?
CVE-2026-72348 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.63% probability of exploitation.
How do I fix CVE-2026-72348?
Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2026-72348 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.