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CVE-2026-80664

HIGHCVSS 7.3/10EPSS 0.18%

Last modified

CVE-2026-80664 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_nat: reject unsupported target families xt_nat SNAT and DNAT target handlers assume IP-family conntrack state is present and can dereference a NULL pointer when instantiated from an unsupported family through nft_compat. A bridge-family compat rule can therefore trigger a NULL-dereference in nf_nat_setup_info(). Reject non-IP families in xt_nat_checkentry() so unsupported targets cannot be installed. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_nat: reject unsupported target families xt_nat SNAT and DNAT target handlers assume IP-family conntrack state is present and can dereference a NULL pointer when instantiated from an unsupported family through nft_compat. A bridge-family compat rule can therefore trigger a NULL-dereference in nf_nat_setup_info(). Reject non-IP families in xt_nat_checkentry() so unsupported targets cannot be installed. Keep NFPROTO_INET allowed for valid inet NAT compat users and leave the runtime fast path unchanged. [ The crash was fixed via 9dbba7e694ec ("netfilter: nft_compat: ebtables emulation must reject non-bridge targets"), so this patch is no longer critical. Nevertheless, NAT is only relevant for ipv4/ipv6, so this extra family check is a good idea in any case. ]

Metrics

CVSS 3.1
7.3/10

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

EPSS Probability
0.18%

7.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

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

VendorProductVersions
LinuxLinux>= c7232c9979cba684c50b64c513c4a83c9aa70563, < 49abe564391411057a26a9a943c8e17867c3b9b4; >= c7232c9979cba684c50b64c513c4a83c9aa70563, < 0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82; >= c7232c9979cba684c50b64c513c4a83c9aa70563, < 4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777; >= c7232c9979cba684c50b64c513c4a83c9aa70563, < a842dab87cab29f2a5798a47b2dc5e6a449950bf; >= c7232c9979cba684c50b64c513c4a83c9aa70563, < e35c048d7511e9d4c2a537b8a231c49606e97c16; >= c7232c9979cba684c50b64c513c4a83c9aa70563, < 679ced28a9dc2f6dc679eb05027d779693e60902; >= c7232c9979cba684c50b64c513c4a83c9aa70563, < ec88fa71c82072e9189983b05b499d3507550271; >= c7232c9979cba684c50b64c513c4a83c9aa70563, < 5d1a2240935ea47e2673d0ea17fdb058e4dc91dd
LinuxLinux3.7

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-80664?
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_nat: reject unsupported target families xt_nat SNAT and DNAT target handlers assume IP-family conntrack state is present and can dereference a NULL pointer when instantiated from an unsupported family through nft_compat. A bridge-family compat rule can therefore trigger a NULL-dereference in nf_nat_setup_info(). Reject non-IP families in xt_nat_checkentry() so unsupported targets cannot be installed. Keep NFPROTO_INET allowed for valid inet NAT compat users and leave the runtime fast path unchanged. [ The crash was fixed via 9dbba7e694ec ("netfilter: nft_compat: ebtables emulation must reject non-bridge targets"), so this patch is no longer critical. Nevertheless, NAT is only relevant for ipv4/ipv6, so this extra family check is a good idea in any case. ]
How severe is CVE-2026-80664?
CVE-2026-80664 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-80664?
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