CVE-2022-49103

Memory exhaustion via leaked NFS open contexts

Published Feb 26, 2025 · Updated May 11, 2026

Resource leak in Linux kernel NFSv4.2 allows local users to exhaust memory through repeated failed COPY_NOTIFY requests. The _nfs42_proc_copy_notify() function returns on two error paths without releasing the ctx reference acquired by get_nfs_open_context(). Reaching the flaw requires low-privileged local access and the affected NFSv4.2 copy-notify path; repeated failures can interrupt service by consuming memory.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in Linux kernel NFSv4.2 allows local users to exhaust memory through repeated failed COPY_NOTIFY requests. The _nfs42_proc_copy_notify() function returns on two error paths without releasing the ctx reference acquired by get_nfs_open_context(). Reaching the flaw requires low-privileged local access and the affected NFSv4.2 copy-notify path; repeated failures can interrupt service by consuming memory.

The record

CVE
CVE-2022-49103
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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=0491567b51efeca807da1125a1a0d5193875e286 <9b9feec97c1fc7dd9bb69f62c4905cddf1801599
  2. Affected versionversion=0491567b51efeca807da1125a1a0d5193875e286 <b37f482ba9f0e6382c188e3fccf6c4b2fdc938eb
  3. Affected versionversion=0491567b51efeca807da1125a1a0d5193875e286 <b7f114edd54326f730a754547e7cfb197b5bc132
  4. Affected versionversion=0491567b51efeca807da1125a1a0d5193875e286 <f46f632f9cfae4b2e3635fa58840a8ec584c42e3
  5. Affected versionversion=0491567b51efeca807da1125a1a0d5193875e286 <fb73bf6305f4eb8f0cf9a61ee874d55f019d6dc4
  6. Affected versionversion=5.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0491567b51efeca807da1125a1a0d5193875e286 <9b9feec97c1fc7dd9bb69f62c4905cddf1801599; version=0491567b51efeca807da1125a1a0d5193875e286 <b37f482ba9f0e6382c188e3fccf6c4b2fdc938eb; version=0491567b51efeca807da1125a1a0d5193875e286 <b7f114edd54326f730a754547e7cfb197b5bc132; version=0491567b51efeca807da1125a1a0d5193875e286 <f46f632f9cfae4b2e3635fa58840a8ec584c42e3; version=0491567b51efeca807da1125a1a0d5193875e286 <fb73bf6305f4eb8f0cf9a61ee874d55f019d6dc4; version=5.5

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NISTCVSS: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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