CVE-2022-50076

Service interruption via leaked deferred-close structures

Published Jun 18, 2025 · Updated May 23, 2026

A CIFS memory leak in affected Linux kernels allows local users to exhaust kernel memory by canceling deferred file closes. In fs/cifs/misc.c, deferred-close cancellation leaves the associated cifs_deferred_close structure allocated instead of releasing it. Exploitation requires low-privileged local access and repeated CIFS close activity; accumulated orphan allocations can interrupt system availability.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A CIFS memory leak in affected Linux kernels allows local users to exhaust kernel memory by canceling deferred file closes. In fs/cifs/misc.c, deferred-close cancellation leaves the associated cifs_deferred_close structure allocated instead of releasing it. Exploitation requires low-privileged local access and repeated CIFS close activity; accumulated orphan allocations can interrupt system availability.

The record

CVE
CVE-2022-50076
Published
Jun 18, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=0ca6ac8a2691762307beaa4841255d1cfe6b2684
  2. Affected versionversion=5.13.12 <5.14
  3. Affected versionversion=5.14
  4. Affected versionversion=9e992755be8f2d458a0bcbefd19e493483c1dba2 <60b6d38add7b9c17d6e5d49ee8e930ea1a5650c5
  5. Affected versionversion=9e992755be8f2d458a0bcbefd19e493483c1dba2 <860efae127888ae535bc4eda1b7f27642727c69e
  6. Affected versionversion=9e992755be8f2d458a0bcbefd19e493483c1dba2 <ca08d0eac020d48a3141dbec0a3cf64fbdb17cde

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0ca6ac8a2691762307beaa4841255d1cfe6b2684; version=5.13.12 <5.14; version=5.14; version=9e992755be8f2d458a0bcbefd19e493483c1dba2 <60b6d38add7b9c17d6e5d49ee8e930ea1a5650c5; version=9e992755be8f2d458a0bcbefd19e493483c1dba2 <860efae127888ae535bc4eda1b7f27642727c69e; version=9e992755be8f2d458a0bcbefd19e493483c1dba2 <ca08d0eac020d48a3141dbec0a3cf64fbdb17cde

Published CVSS scores

5.5UbuntuCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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