CVE-2022-48721

Local privilege escalation via SMC waitqueue race

Published Jun 20, 2024 · Updated Aug 5, 2026

An SMC waitqueue race in affected Linux kernel releases allows local users to crash the kernel during fallback from SMC to TCP. The fallback path privately moves epoll entries from smc socket->wq to clcsock->wq while their owners continue synchronizing through the original waitqueue lock, allowing concurrent removal during iteration. An unprivileged local process can create an SMC socket, attach epoll waiters, and race fallback wakeups; successful memory reuse also enables kernel reads, writes, or code execution.

CVSS severity7.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An SMC waitqueue race in affected Linux kernel releases allows local users to crash the kernel during fallback from SMC to TCP. The fallback path privately moves epoll entries from smc socket->wq to clcsock->wq while their owners continue synchronizing through the original waitqueue lock, allowing concurrent removal during iteration. An unprivileged local process can create an SMC socket, attach epoll waiters, and race fallback wakeups; successful memory reuse also enables kernel reads, writes, or code execution.

The record

CVE
CVE-2022-48721
Published
Jun 20, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=2153bd1e3d3dbf6a3403572084ef6ed31c53c5f0 <341adeec9adad0874f29a0a1af35638207352a39
  2. Affected versionversion=2153bd1e3d3dbf6a3403572084ef6ed31c53c5f0 <504078fbe9dd570d685361b57784a6050bc40aaa
  3. Affected versionversion=5.10.84 <5.11
  4. Affected versionversion=5.15.7 <5.15.22
  5. Affected versionversion=5.16
  6. Affected versionversion=5.4.164 <5.5
  7. Affected versionversion=d6e981ec9491be5ec46d838b1151e7edefe607f5
  8. Affected versionversion=fb92e025baa73e99250b79ab64f4e088d2888993 <0ef6049f664941bc0f75828b3a61877635048b27
  9. Affected versionversion=ff6eeb627898c179aac421af5d6515d3f50b84df

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2153bd1e3d3dbf6a3403572084ef6ed31c53c5f0 <341adeec9adad0874f29a0a1af35638207352a39; version=2153bd1e3d3dbf6a3403572084ef6ed31c53c5f0 <504078fbe9dd570d685361b57784a6050bc40aaa; version=5.10.84 <5.11; version=5.15.7 <5.15.22; version=5.16; version=5.4.164 <5.5; version=d6e981ec9491be5ec46d838b1151e7edefe607f5; version=fb92e025baa73e99250b79ab64f4e088d2888993 <0ef6049f664941bc0f75828b3a61877635048b27; version=ff6eeb627898c179aac421af5d6515d3f50b84df

Published CVSS scores

7.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

T1068Exploitation for Privilege Escalation

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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