CVE-2022-50862Public exploit

Kernel warning via invalid BTF return type

Published Dec 30, 2025 · Updated Dec 30, 2025

Improper BTF validation in Linux kernel 5.15 through 6.0.6 allows local users to trigger a kernel warning through crafted BTF metadata. The btf_func_proto_check function accepts a BTF_KIND_DECL_TAG record as a function-prototype return type, causing btf_type_id_size to reach its warning path while resolving the invalid type. Reaching BPF_BTF_LOAD requires CAP_SYS_ADMIN; the published reproducer reports a warning, not a crash or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper BTF validation in Linux kernel 5.15 through 6.0.6 allows local users to trigger a kernel warning through crafted BTF metadata. The btf_func_proto_check function accepts a BTF_KIND_DECL_TAG record as a function-prototype return type, causing btf_type_id_size to reach its warning path while resolving the invalid type. Reaching BPF_BTF_LOAD requires CAP_SYS_ADMIN; the published reproducer reports a warning, not a crash or code execution.

The record

CVE
CVE-2022-50862
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record 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=5.16
  2. Affected versionversion=bd16dee66ae4de3f1726c69ac901d2b7a53b0c86 <e9dbb4c539d058852b76937dcd7347d3f38054f2
  3. Affected versionversion=bd16dee66ae4de3f1726c69ac901d2b7a53b0c86 <ea68376c8bed5cd156900852aada20c3a0874d17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.16; version=bd16dee66ae4de3f1726c69ac901d2b7a53b0c86 <e9dbb4c539d058852b76937dcd7347d3f38054f2; version=bd16dee66ae4de3f1726c69ac901d2b7a53b0c86 <ea68376c8bed5cd156900852aada20c3a0874d17

Published CVSS scores

No CVSS assessment is available in this record.

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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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