CVE-2022-49765

Local service interruption via inconsistent 9p transport locking

Published May 1, 2025 · Updated May 11, 2026

Improper resource locking in the Linux kernel allows local users to interrupt service through the 9p file-system transport. The trans_fd path uses struct p9_client->lock with spin_lock() while IRQ-context p9_tag_remove() reaches the same lock with spin_lock_irqsave(), mixing incompatible lock state across unrelated protections. Triggering requires low-privileged local access and use of the 9p trans_fd transport; public sources do not specify whether interruption is a hang or crash.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper resource locking in the Linux kernel allows local users to interrupt service through the 9p file-system transport. The trans_fd path uses struct p9_client->lock with spin_lock() while IRQ-context p9_tag_remove() reaches the same lock with spin_lock_irqsave(), mixing incompatible lock state across unrelated protections. Triggering requires low-privileged local access and use of the 9p trans_fd transport; public sources do not specify whether interruption is a hang or crash.

The record

CVE
CVE-2022-49765
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-413
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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

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=2.6.28
  2. Affected versionversion=673d62cdaac6ffbce980a349d3174b3929ceb9e5 <296ab4a813841ba1d5f40b03190fd1bd8f25aab0
  3. Affected versionversion=673d62cdaac6ffbce980a349d3174b3929ceb9e5 <43bbadb7e4636dc02f6a283c2a39e6438e6173cd
  4. Affected versionversion=673d62cdaac6ffbce980a349d3174b3929ceb9e5 <717b9b4f38703d7f5293059e3a242d16f76fa045

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.28; version=673d62cdaac6ffbce980a349d3174b3929ceb9e5 <296ab4a813841ba1d5f40b03190fd1bd8f25aab0; version=673d62cdaac6ffbce980a349d3174b3929ceb9e5 <43bbadb7e4636dc02f6a283c2a39e6438e6173cd; version=673d62cdaac6ffbce980a349d3174b3929ceb9e5 <717b9b4f38703d7f5293059e3a242d16f76fa045

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS: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-413Improper Resource Locking

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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