CVE-2025-37939

Memory disclosure via truncated BTF.ext header

Published May 20, 2025 · Updated May 11, 2026

Out-of-bounds read in Linux libbpf 6.13 through 6.14.1 allows local users to read memory via a malformed BTF.ext section. btf_ext_parse_info() reads optional core_relo_off and core_relo_len fields without first confirming that the BTF.ext header includes them. Triggering the read requires a local process to make libbpf parse crafted BPF object metadata; published evidence establishes a buffer over-read but no code execution or data modification.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux libbpf 6.13 through 6.14.1 allows local users to read memory via a malformed BTF.ext section. btf_ext_parse_info() reads optional core_relo_off and core_relo_len fields without first confirming that the BTF.ext header includes them. Triggering the read requires a local process to make libbpf parse crafted BPF object metadata; published evidence establishes a buffer over-read but no code execution or data modification.

The record

CVE
CVE-2025-37939
Published
May 20, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-120
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.13
  2. Affected versionversion=cf579164e9ea9cd41c7c1da931683a319d224890 <0a7c2a84359612e54328aa52030eb202093da6e2
  3. Affected versionversion=cf579164e9ea9cd41c7c1da931683a319d224890 <3a67f60f0a8be10cea7a884a1a00e9feb6645657
  4. Affected versionversion=cf579164e9ea9cd41c7c1da931683a319d224890 <d529411ec44535308c5d59cbeff74be6fe14b479

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.13; version=cf579164e9ea9cd41c7c1da931683a319d224890 <0a7c2a84359612e54328aa52030eb202093da6e2; version=cf579164e9ea9cd41c7c1da931683a319d224890 <3a67f60f0a8be10cea7a884a1a00e9feb6645657; version=cf579164e9ea9cd41c7c1da931683a319d224890 <d529411ec44535308c5d59cbeff74be6fe14b479

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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