# CVE-2023-53733: net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode

> A missing undo operation in the Linux kernel's traffic control scheduler can lead to resource leaks or instability when hardware offload fails.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Oct 2025
- **Updated:** 15 Oct 2026
- **Also known as:** BELL-CVE-2023-53733, DEBIAN-CVE-2023-53733, GHSA-x89v-x9wm-242x, ROOT-OS-DEBIAN-11-CVE-2023-53733, ROOT-OS-UBUNTU-2204-CVE-2023-53733, UBUNTU-CVE-2023-53733

## What is CVE-2023-53733?

CVE-2023-53733 is a high-severity vulnerability in Linux, published on 24 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode

When u32_replace_hw_knode fails, we need to undo the tcf_bind_filter
operation done at u32_set_parms.

## Which versions are affected by CVE-2023-53733?


## How do I fix CVE-2023-53733?

Apply the vendor's patch.

## Is CVE-2023-53733 being exploited?

There is no known exploitation of CVE-2023-53733 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-53733 and fix it if it is affected.

What it is: CVE-2023-53733 is a high-severity vulnerability in Linux, published on 24 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-53733 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-53733/ (Markdown: https://insights.sbomify.com/CVE-2023-53733/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-53733
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-53733
- OSV: https://osv.dev/vulnerability/CVE-2023-53733

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-53733/
Summaries are generated and may contain mistakes; the official description above is the record.