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CVE Record

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

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue lets a user trigger an unnecessary kernel warning from the BPF verifier log. The source states normal behavior continues and only part of one log line may be truncated. Treat it as low business urgency unless your exposure depends on strict kernel warning policies or untrusted BPF use.

Executive priority

Handle through normal Linux kernel maintenance. Current sources support user-triggered warning noise, not confirmed compromise or data loss. Escalate only for environments with untrusted local users and sensitive BPF exposure.

Technical view

The BPF verifier used a fixed 1024-byte log buffer. User-controlled BTF names and BTF.ext source-line strings could exceed that buffer and trigger a WARN_ONCE for truncated verifier log output. The fix removes the warning because truncation can be expected and the code still behaves correctly.

Likely exposure

Potential exposure is Linux systems running affected kernel versions listed in the CVE record, especially where users or applications can submit BPF content. The provided sources do not define privilege requirements, distributions, or package versions.

Exploitation context

The source says the warning is trivial for a user to trigger. It does not cite active exploitation, KEV listing, privilege escalation, data exposure, or remote attack paths.

Researcher notes

Evidence is narrow. No CVSS, CWE, KEV, exploit status, or distro mapping is provided. The commits resolve behavior by dropping WARN_ONCE, not by changing verifier acceptance logic or adding access controls.

Mitigation direction

  • Update to a vendor kernel containing the referenced stable fixes.
  • Check distribution advisories for package-specific fixed versions.
  • Prioritize routinely unless internal policy treats kernel warnings as high impact.
  • Review BPF access controls for untrusted users where applicable.

Validation and detection

  • Inventory Linux kernel versions against the CVE record.
  • Confirm whether the referenced stable commits are present in your kernel tree.
  • Check vendor advisories for your exact distribution and package branch.
  • Review kernel logs for related verifier truncation warnings as supporting context only.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
4Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxa2a7d5701052542cd2260e7659b12443e0a74733, a2a7d5701052542cd2260e7659b12443e0a74733, a2a7d5701052542cd2260e7659b12443e0a74733unaffected
LinuxLinux4.15, 0, 6.1.107, 6.4.7, 6.5affected
Weakness

CWE details

No CWE listed

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