CVE-2022-50460

Local service interruption via leaked CIFS transaction IDs

Published Oct 1, 2025 · Updated Oct 1, 2025

Resource leak in the Linux kernel CIFS client allows local users to interrupt service through repeated non-flock locking requests. The cifs_flock function allocates an XID before checking FL_FLOCK, then returns ENOLCK on the non-flock path without calling free_xid. Exploitation requires local access to a CIFS-backed file; the published impact is limited to availability, with no reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.15%
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 the Linux kernel CIFS client allows local users to interrupt service through repeated non-flock locking requests. The cifs_flock function allocates an XID before checking FL_FLOCK, then returns ENOLCK on the non-flock path without calling free_xid. Exploitation requires local access to a CIFS-backed file; the published impact is limited to availability, with no reported data disclosure or modification.

The record

CVE
CVE-2022-50460
Published
Oct 1, 2025
Updated
Oct 1, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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=5.5
  2. Affected versionversion=d0677992d2af3d65f1c1c21de3323d09d4891537 <2d08311aa3056a84bfdc09bc47777de6a9b16c30
  3. Affected versionversion=d0677992d2af3d65f1c1c21de3323d09d4891537 <575e079c782b9862ec2626403922d041a42e6ed6
  4. Affected versionversion=d0677992d2af3d65f1c1c21de3323d09d4891537 <8905d13b9ede4caa88c577faed832d6c7383f4fb
  5. Affected versionversion=d0677992d2af3d65f1c1c21de3323d09d4891537 <f8c9b4a963fec5d0e37e3e8522bb19b0c28e1a73

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.5; version=d0677992d2af3d65f1c1c21de3323d09d4891537 <2d08311aa3056a84bfdc09bc47777de6a9b16c30; version=d0677992d2af3d65f1c1c21de3323d09d4891537 <575e079c782b9862ec2626403922d041a42e6ed6; version=d0677992d2af3d65f1c1c21de3323d09d4891537 <8905d13b9ede4caa88c577faed832d6c7383f4fb; version=d0677992d2af3d65f1c1c21de3323d09d4891537 <f8c9b4a963fec5d0e37e3e8522bb19b0c28e1a73

Published CVSS scores

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

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

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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