Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/JustineDevs/premortemnpx agentmods add skills/justinedevs/premortem/kernel-exploitationWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/justinedevs/premortem/kernel-exploitation)<a href="https://agentmods.dev/skills/justinedevs/premortem/kernel-exploitation"><img src="https://agentmods.dev/badge/skills/justinedevs/premortem/kernel-exploitation/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/justinedevs/premortem/kernel-exploitation"><img src="https://agentmods.dev/badge/skills/justinedevs/premortem/kernel-exploitation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00054 | $0.02952 |
| Opus 5 | $0.00027 | $0.01476 |
| Sonnet 5 | $0.00011 | $0.00590 |
| Haiku 4.5 | $0.00005 | $0.00295 |
Grade B, and why
kernel-exploitation scanned grade B with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
echo 'cp /flag /tmp/flag && chmod 777 /tmp/flag' >> /tmp/x Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
wget https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.1.tar.xz This is a copy
100% identical to kernel-exploitation — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 308 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL: Linux Kernel Exploitation — Expert Attack Playbook
AI LOAD INSTRUCTION: Expert kernel exploitation techniques. Covers environment setup (QEMU), vulnerability classes, privilege escalation targets, kernel ROP, ret2usr, stack pivoting, and cross-cache attacks. Distilled from ctf-wiki kernel-mode sections and real-world kernel CVEs. Base models often confuse user-mode and kernel-mode exploitation constraints, especially regarding SMEP/SMAP/KPTI.
0. RELATED ROUTING
- binary-protection-bypass — userspace protections (NX, ASLR) also apply in kernel context
- stack-overflow-and-rop — kernel ROP reuses many userspace ROP concepts
- heap-exploitation — kernel SLUB is conceptually related to userspace heap
- linux-privilege-escalation — non-exploit kernel privesc techniques
Advanced References
- KERNEL_MITIGATION_BYPASS.md — KASLR, SMEP, SMAP, KPTI, FG-KASLR, CFI bypass techniques
- KERNEL_HEAP_TECHNIQUES.md — SLUB internals, cross-cache attacks, msg_msg/pipe_buffer/sk_buff exploitation
1. EXPLOITATION MODEL
┌─────────────────────────────────────────────────────┐
│ 1. Find Vulnerability │
│ (UAF, OOB, race, integer overflow, type confusion)│
├─────────────────────────────────────────────────────┤
│ 2. Build Primitive │
│ (arbitrary read, arbitrary write, controlled RIP)│
├─────────────────────────────────────────────────────┤
│ 3. Bypass Mitigations │
│ (KASLR, SMEP, SMAP, KPTI) │
├─────────────────────────────────────────────────────┤
│ 4. Escalate Privileges │
│ (commit_creds, modprobe_path, namespace escape) │
├─────────────────────────────────────────────────────┤
│ 5. Return to Userspace Cleanly │
│ (KPTI trampoline, iretq/sysretq, swapgs) │
└─────────────────────────────────────────────────────┘
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 308 lines · 54 tokens per session scan B 9f5deef00930
kernel-exploitation is a skill published in the GitHub repository JustineDevs/premortem (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 54 tokens to every session and 2,952 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it B with 2 findings (asks for root, makes network calls). It is 100% identical to kernel-exploitation, differing in 0 lines, and is treated as a copy.
Other skills, from other repositories
awesome-azd-template-submit
Submit an azd template to the awesome-azd gallery. Use when asked to submit, add, or contribute a template to awesome-azd. Requires only a GitHub repository URL — all metadata (title, description, languages, frameworks, Azure services, IaC) is auto-detected by the submission pipeline.
azure-cli
Use the Azure CLI to manage subscriptions, resource groups, AKS, App Service, Key Vault, and role assignments.
bitbottle
Reference for the bitbottle CLI — a gh-style tool for Bitbucket Server/DC and Cloud. Load when the user asks about bitbottle commands, auth setup, PRs, repos, branches, tags, commits, pipelines, or why a command failed. Load even if the user just says "bitbottle", mentions "Bitbucket", or pastes a bitbottle error…
azure-cli
A command-line tool for managing Microsoft Azure, Microsoft's cloud platform, from a terminal. It covers account sign-in, subscriptions, resource groups, virtual machines, and other cloud resources.
extract-api
This skill should be used when the user asks to "extract API from", "import API from", "add commands from this repo", "register API from docs", "convert docs to CLI commands", "import Postman collection", or provides a GitHub repository URL, a documentation site URL, a Postman collection file/URL, or a local API…
sidekick
ALWAYS run sdkck search FIRST before using ANY tool, MCP server, Bash command, or external API. sdkck is the canonical command surface for Jira, Sentry, MySQL, Postgres, Supabase, Bitbucket, Confluence, and imported OpenAPI/Postman specs. Trigger on every task involving external systems, APIs, databases, tickets…