CVE-2022-50302Network attack vector

Remote kernel panic via uninitialized lock state

Published Sep 15, 2025 · Updated Sep 15, 2025

Denial of service in Linux kernel lockd allows remote attackers to panic re-exporting NFSv3 servers through crafted NLM requests. The nlm_unlock_files path passes a partially initialized file_lock to vfs_lock_file, leaving fl_file NULL until nlmclnt_setlockargs dereferences it. Network reachability to an allowed NFS/NLM export on a server re-exporting NFSv3 is sufficient; the bounded consequence is a kernel panic and service interruption.

CVSS severity7.5
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel lockd allows remote attackers to panic re-exporting NFSv3 servers through crafted NLM requests. The nlm_unlock_files path passes a partially initialized file_lock to vfs_lock_file, leaving fl_file NULL until nlmclnt_setlockargs dereferences it. Network reachability to an allowed NFS/NLM export on a server re-exporting NFSv3 is sufficient; the bounded consequence is a kernel panic and service interruption.

The record

CVE
CVE-2022-50302
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=486c1acf14233b1ff7b37e6f026a737a2f7f53f1 <31c93ee5f1e4dc278b562e20f3c3274ac34997f3
  2. Affected versionversion=5.19
  3. Affected versionversion=58c3f48a540b821b3253e2dc31c8fa237293ffc9
  4. Affected versionversion=9c3eef773cf4a8a18f959234bbb4c0a55c31ab71 <95d42a8d3d4ae84a0bd3ee23e1fee240cdf0a9f0
  5. Affected versionversion=aec158242b87a43d83322e99bc71ab4428e5ab79 <18ebd35b61b4693a0ddc270b6d4f18def232e770
  6. Affected versionversion=aec158242b87a43d83322e99bc71ab4428e5ab79 <688575aef211b0986fc51010116f5888a99d76a2
  7. Affected versionversion=aec158242b87a43d83322e99bc71ab4428e5ab79 <d7aa9f7778316beb690f6e2763b6d672ad8b256f

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=486c1acf14233b1ff7b37e6f026a737a2f7f53f1 <31c93ee5f1e4dc278b562e20f3c3274ac34997f3; version=5.19; version=58c3f48a540b821b3253e2dc31c8fa237293ffc9; version=9c3eef773cf4a8a18f959234bbb4c0a55c31ab71 <95d42a8d3d4ae84a0bd3ee23e1fee240cdf0a9f0; version=aec158242b87a43d83322e99bc71ab4428e5ab79 <18ebd35b61b4693a0ddc270b6d4f18def232e770; version=aec158242b87a43d83322e99bc71ab4428e5ab79 <688575aef211b0986fc51010116f5888a99d76a2; version=aec158242b87a43d83322e99bc71ab4428e5ab79 <d7aa9f7778316beb690f6e2763b6d672ad8b256f

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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