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CVE-2020-14386 is a Linux kernel memory-corruption vulnerability affecting kernels before 5.9-rc4. In the AF_PACKET receive path, tpacket_rcv adds the user-influenced packet-reserve value to the unsigned-short netoff value without adequate bounds handling. The resulting integer overflow can cause a subsequent offset calculation to reference memory before the start of the packet buffer. When virtual network-header handling is enabled, this enables an attacker-controlled out-of-bounds write of 1 to 10 bytes before that buffer.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept (PoC) exploit for CVE-2020-14386, a Linux kernel vulnerability affecting packet sockets. The main exploit is implemented in C (cve-cap-net-raw.c), which sets up user and network namespaces, manipulates raw packet sockets, and sends crafted packets to the loopback interface to trigger the vulnerability. The exploit is wrapped in a Bash script (wrapper.sh) that provides user-friendly output and timing, and is packaged in a Docker container for easy deployment in Kubernetes/OpenShift environments. The repository also includes a configuration file (50-reset-crio-capabilities.conf) to mitigate the vulnerability by dropping the CAP_NET_RAW capability from default container configurations. The README provides instructions for deploying the exploit as a pod in a Kubernetes cluster and describes expected outcomes. The exploit is local in nature, requiring execution on the target node, and is intended to test whether a node is vulnerable by observing if it crashes or reboots upon running the exploit.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel memory-corruption vulnerability in net/packet/af_packet.c that can lead to elevation of privilege.
A Linux kernel memory-corruption vulnerability in net/packet/af_packet.c that can lead to privilege escalation.
A Linux kernel memory-corruption vulnerability in net/packet/af_packet.c that can lead to elevation of privilege.
A Linux kernel memory-corruption vulnerability in net/packet/af_packet.c that can lead to local privilege escalation.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.