CVE-2022-49443

Service interruption via lockless epoll list access

Published Feb 26, 2025 · Updated May 11, 2026

Race condition in affected Linux kernel releases allows local users to interrupt service through concurrent epoll wait calls. The ep_poll path calls ep_events_available without a lock, while list_empty_careful reads rdllist->prev as another path can reinitialize the list head, permitting an eight-byte load to tear against a concurrent store. Exploitation requires low-privileged local access, concurrent execution, and winning a high-complexity timing window; the reported consequence is limited to system availability.

CVSS severity4.7
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in affected Linux kernel releases allows local users to interrupt service through concurrent epoll wait calls. The ep_poll path calls ep_events_available without a lock, while list_empty_careful reads rdllist->prev as another path can reinitialize the list head, permitting an eight-byte load to tear against a concurrent store. Exploitation requires low-privileged local access, concurrent execution, and winning a high-complexity timing window; the reported consequence is limited to system availability.

The record

CVE
CVE-2022-49443
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499
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=4.12
  2. Affected versionversion=bf3b9f6372c45b0fbf24d86b8794910d20170017 <5d5d993f16be15d124be7b8ec71b28ef7b7dc3af
  3. Affected versionversion=bf3b9f6372c45b0fbf24d86b8794910d20170017 <cb3e48f7a35033deb9455abe3932e63cb500b9eb
  4. Affected versionversion=bf3b9f6372c45b0fbf24d86b8794910d20170017 <d679ae94fdd5d3ab00c35078f5af5f37e068b03d
  5. Affected versionversion=bf3b9f6372c45b0fbf24d86b8794910d20170017 <e039c0b5985999b150594126225e1ee51df7b4c9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=bf3b9f6372c45b0fbf24d86b8794910d20170017 <5d5d993f16be15d124be7b8ec71b28ef7b7dc3af; version=bf3b9f6372c45b0fbf24d86b8794910d20170017 <cb3e48f7a35033deb9455abe3932e63cb500b9eb; version=bf3b9f6372c45b0fbf24d86b8794910d20170017 <d679ae94fdd5d3ab00c35078f5af5f37e068b03d; version=bf3b9f6372c45b0fbf24d86b8794910d20170017 <e039c0b5985999b150594126225e1ee51df7b4c9

Published CVSS scores

4.7CISA ADP VulnrichmentCVSS:3.1/AV:L/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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