CVE-2022-50280Public exploit

Kernel crash via unterminated mount peer traversal

Published Sep 15, 2025 · Updated Sep 15, 2025

NULL pointer dereference in Linux kernel mount propagation allows local users to crash the kernel through an unprivileged user namespace. The propagate_mnt() traversal fails to stop at peers of the source mount while locating source copies that become masters above destination-tree slaves, eventually following a NULL mount pointer. Exploitation requires local low-privileged access with unprivileged user namespaces enabled and causes a system-wide kernel crash rather than data disclosure or modification.

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

What happened

NULL pointer dereference in Linux kernel mount propagation allows local users to crash the kernel through an unprivileged user namespace. The propagate_mnt() traversal fails to stop at peers of the source mount while locating source copies that become masters above destination-tree slaves, eventually following a NULL mount pointer. Exploitation requires local low-privileged access with unprivileged user namespaces enabled and causes a system-wide kernel crash rather than data disclosure or modification.

The record

CVE
CVE-2022-50280
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.15
  2. Affected versionversion=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <11933cf1d91d57da9e5c53822a540bbdc2656c16
  3. Affected versionversion=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <2dae4211b579ce98985876a73a78466e285238ff
  4. Affected versionversion=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <784a4f995ee24460aa72e00b085612fad57ebce5
  5. Affected versionversion=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <7f57df69de7f05302fad584eb8e3f34de39e0311
  6. Affected versionversion=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <b591b2919d018ef91b4a9571edca94105bcad3df
  7. Affected versionversion=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <c24cc476acd8bccb5af54849aac5e779d8223bf5
  8. Affected versionversion=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <cad0d17fb2b0540180ab59e2cd48ad348cc1ee4c
  9. Affected versionversion=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <cc997490be65da0af8c75a6244fc80bb66c53ce0
  10. Affected versionversion=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <e7c9f10c44a8919cd8bbd51b228c84d0caf7d518
  11. Affected versionversion=fc7b1646bf29f722277bdd19551e01420ce9da8f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.15; version=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <11933cf1d91d57da9e5c53822a540bbdc2656c16; version=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <2dae4211b579ce98985876a73a78466e285238ff; version=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <784a4f995ee24460aa72e00b085612fad57ebce5; version=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <7f57df69de7f05302fad584eb8e3f34de39e0311; version=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <b591b2919d018ef91b4a9571edca94105bcad3df; version=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <c24cc476acd8bccb5af54849aac5e779d8223bf5; version=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <cad0d17fb2b0540180ab59e2cd48ad348cc1ee4c; version=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <cc997490be65da0af8c75a6244fc80bb66c53ce0; version=f2ebb3a921c1ca1e2ddd9242e95a1989a50c4c68 <e7c9f10c44a8919cd8bbd51b228c84d0caf7d518; version=fc7b1646bf29f722277bdd19551e01420ce9da8f

Published CVSS scores

5.5NVDCVSS: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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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