CVE-2022-49767

Local denial of service via blocking 9p pipes

Published May 1, 2025 · Updated May 11, 2026

Denial of service in Linux kernel 9p transport code allows local users to hang kernel workqueue tasks through pipe-backed file descriptors. The p9_fd_open path leaves supplied pipe descriptors blocking, so p9_mux_poll_stop cannot interrupt kernel_read or kernel_write during connection teardown. Exploitation requires local access to create a pipe-backed 9p transport and close it while I/O is pending, causing affected workqueue tasks to remain hung.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel 9p transport code allows local users to hang kernel workqueue tasks through pipe-backed file descriptors. The p9_fd_open path leaves supplied pipe descriptors blocking, so p9_mux_poll_stop cannot interrupt kernel_read or kernel_write during connection teardown. Exploitation requires local access to create a pipe-backed 9p transport and close it while I/O is pending, causing affected workqueue tasks to remain hung.

The record

CVE
CVE-2022-49767
Published
May 1, 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. 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

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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=2.6.17
  2. Affected versionversion=27979bb2ff748613dba96ae66392a76fb0678527 <0b5e6bd72b8171364616841603a70e4ba9837063
  3. Affected versionversion=27979bb2ff748613dba96ae66392a76fb0678527 <0e07032b4b4724b8ad1003698cb81083c1818999
  4. Affected versionversion=27979bb2ff748613dba96ae66392a76fb0678527 <5af16182c5639349415118e9e9aecd8355f7a08b
  5. Affected versionversion=27979bb2ff748613dba96ae66392a76fb0678527 <7abf40f06a76c0dff42eada10597917e9776fbd4
  6. Affected versionversion=27979bb2ff748613dba96ae66392a76fb0678527 <9f8554615df668e4bf83294633ee9d232b28ce45
  7. Affected versionversion=27979bb2ff748613dba96ae66392a76fb0678527 <a8e2fc8f7b41fa9d9ca5f624f4e4d34fce5b40a9
  8. Affected versionversion=27979bb2ff748613dba96ae66392a76fb0678527 <b1ad04da7fe4515e2ce2d5f2dcab3b5b6d45614b
  9. Affected versionversion=27979bb2ff748613dba96ae66392a76fb0678527 <ef575281b21e9a34dfae544a187c6aac2ae424a9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.17; version=27979bb2ff748613dba96ae66392a76fb0678527 <0b5e6bd72b8171364616841603a70e4ba9837063; version=27979bb2ff748613dba96ae66392a76fb0678527 <0e07032b4b4724b8ad1003698cb81083c1818999; version=27979bb2ff748613dba96ae66392a76fb0678527 <5af16182c5639349415118e9e9aecd8355f7a08b; version=27979bb2ff748613dba96ae66392a76fb0678527 <7abf40f06a76c0dff42eada10597917e9776fbd4; version=27979bb2ff748613dba96ae66392a76fb0678527 <9f8554615df668e4bf83294633ee9d232b28ce45; version=27979bb2ff748613dba96ae66392a76fb0678527 <a8e2fc8f7b41fa9d9ca5f624f4e4d34fce5b40a9; version=27979bb2ff748613dba96ae66392a76fb0678527 <b1ad04da7fe4515e2ce2d5f2dcab3b5b6d45614b; version=27979bb2ff748613dba96ae66392a76fb0678527 <ef575281b21e9a34dfae544a187c6aac2ae424a9

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 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.

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Technologies

Your stack

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Your stack

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