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CVE-2022-36946 is an input-validation flaw in the Linux kernel Netfilter nfnetlink_queue queue handler, affecting the nfqnl_mangle function. Processing an NFQUEUE verdict containing a one-byte nfta_payload attribute can cause skb_pull() to operate on a negative skb length, producing a malformed socket buffer. The resulting invalid state can panic the kernel.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept (PoC) exploit for CVE-2022-36946, a vulnerability in the Linux kernel's netfilter nfnetlink_queue module that allows a local user to trigger a kernel panic (denial of service) by sending a verdict with a 0-byte payload. The exploit is implemented in C and includes three main variants: 'panic6.c' (standard), 'panic6_podman.c' (for use in Podman containers), and 'panic6_rootless.c' (for rootless exploitation using user namespaces). The exploit works by creating a netfilter queue, associating it with TCP port 1337 via iptables, and then sending a crafted verdict to the kernel. The repository also includes a Dockerfile for building the exploit in a container, a shell script ('run.sh') for running the exploit with the correct libraries, and prebuilt shared libraries for different architectures. The README provides detailed instructions, including a remote script for automated exploitation. The exploit targets Linux kernels prior to 5.19 and requires CAP_NET_ADMIN, which can be obtained in a user namespace if the system is configured accordingly. The main attack vector is local, but the exploit can be run in containers or with unprivileged users if user namespaces are enabled.
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A high-severity remote denial-of-service vulnerability in the Linux kernel Netfilter NFQUEUE implementation. A crafted one-byte NFTA_PAYLOAD attribute in an NFQUEUE verdict can cause a negative skb length during skb_pull, triggering a kernel panic.
Linux kernel denial-of-service flaw in Netfilter nfqnl_mangle().
Linux kernel Netfilter nfnetlink_queue denial-of-service vulnerability in nfqnl_mangle().
Linux kernel Netfilter nfnetlink_queue denial-of-service vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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