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CVE-2026-72348

CRITICALCVSS 9.1/10EPSS 0.23%

Last modified

CVE-2026-72348 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability
0.23%

14.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f16d856b6af5fd0e7cb0b0212f70825b599ef72e; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < fc416870100cf16d5b9495199355a679c3a02d48; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f775fcf384b06f35b612f78fa5601fee99eb6513; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2fd89a50a9783eed8ed23866b11c8b3d8779a7a8; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3578b6d92a5b1e603ae6e8c8f5538a709f03aba4; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3d441be2b1c5e98167302fa1c7b61960a067b112; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 43ccc20b5a733226417832cf16ef45322e594990
LinuxLinux2.6.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-72348?
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 severe is CVE-2026-72348?
CVE-2026-72348 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72348?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST