In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_nat: reject unsupported target families xt_nat SNAT a…
CVE-2026-80664 · published 28 Aug 2026
How serious is it
- Severity: high, CVSS score 7.3 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-80664?
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Who is affected
- Linux Linux: 3.7
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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. ]
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/0afc9ad987c0faa80ab5f8d6e7815085ac8dbb82
- git.kernel.org/stable/c/49abe564391411057a26a9a943c8e17867c3b9b4
- git.kernel.org/stable/c/4fbc2bac02edabb665beb2aa87ca6f1e1d4c4777
- git.kernel.org/stable/c/5d1a2240935ea47e2673d0ea17fdb058e4dc91dd
- git.kernel.org/stable/c/679ced28a9dc2f6dc679eb05027d779693e60902
- git.kernel.org/stable/c/a842dab87cab29f2a5798a47b2dc5e6a449950bf
- git.kernel.org/stable/c/e35c048d7511e9d4c2a537b8a231c49606e97c16
- git.kernel.org/stable/c/ec88fa71c82072e9189983b05b499d3507550271
Merged from NVD. Last updated 24 Oct 2026. All vulnerabilities · RSS · JSON