# CVE-2023-54145: bpf: drop unnecessary user-triggerable WARN_ONCE in verifierl log

> A local attacker can trigger a kernel warning by providing large BTF data, potentially causing log noise or resource exhaustion in the Linux kernel verifier.

- **Severity:** Not scored
- **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 Dec 2025
- **Updated:** 11 May 2026
- **Also known as:** BELL-CVE-2023-54145, DEBIAN-CVE-2023-54145, GHSA-m575-6r3m-823p, ROOT-OS-DEBIAN-11-CVE-2023-54145, ROOT-OS-UBUNTU-2204-CVE-2023-54145, UBUNTU-CVE-2023-54145

## What is CVE-2023-54145?

CVE-2023-54145 is a denial of service vulnerability in Linux, published on 24 Dec 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:

bpf: drop unnecessary user-triggerable WARN_ONCE in verifierl log

It's trivial for user to trigger "verifier log line truncated" warning,
as verifier has a fixed-sized buffer of 1024 bytes (as of now), and there are at
least two pieces of user-provided information that can be output through
this buffer, and both can be arbitrarily sized by user:
  - BTF names;
  - BTF.ext source code lines strings.

Verifier log buffer should be properly sized for typical verifier state
output. But it's sort-of expected that this buffer won't be long enough
in some circumstances. So let's drop the check. In any case code will
work correctly, at worst truncating a part of a single line output.

## Which versions are affected by CVE-2023-54145?


## How do I fix CVE-2023-54145?

Apply the vendor's patch.

## Is CVE-2023-54145 being exploited?

There is no known exploitation of CVE-2023-54145 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-54145 and fix it if it is affected.

What it is: CVE-2023-54145 is a denial of service vulnerability in Linux, published on 24 Dec 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-2023-54145 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-2023-54145/ (Markdown: https://insights.sbomify.com/CVE-2023-54145/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-54145
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-54145
- OSV: https://osv.dev/vulnerability/CVE-2023-54145

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-54145/
Summaries are generated and may contain mistakes; the official description above is the record.