Linux Kernel Heap Out-of-Bounds Write Vulnerability
CVE-2021-22555
How serious is it
- Severity: not rated yet.
- No exploit prediction (EPSS) score yet.
- Confirmed exploited in the wild (CISA KEV).
- Public exploit code exists: EDB-50135.
Is your app affected by CVE-2021-22555?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Kernel
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
Linux Kernel contains a heap out-of-bounds write vulnerability that could allow an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space.
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
- No references listed.
Merged from CISA KEV, Exploit-DB. Last updated 24 Oct 2026. All vulnerabilities · RSS · JSON