CVE-2022-49709

Local denial of service via invalid RCU state

Published Feb 26, 2025 · Updated May 11, 2026

Incorrect RCU state handling in the Linux kernel allows local users to interrupt kernel operation through the CFI cpuidle path. During __cfi_slowpath_diag, RCU_NONIDLE wakes RCU around only part of the CFI shadow or module check while cpuidle enters a quiescent state, leaving the RCU state invalid. Exploitation requires local low-privilege access and the affected CFI configuration; published impact is limited to availability, with no reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect RCU state handling in the Linux kernel allows local users to interrupt kernel operation through the CFI cpuidle path. During __cfi_slowpath_diag, RCU_NONIDLE wakes RCU around only part of the CFI shadow or module check while cpuidle enters a quiescent state, leaving the RCU state invalid. Exploitation requires local low-privilege access and the affected CFI configuration; published impact is limited to availability, with no reported data disclosure or modification.

The record

CVE
CVE-2022-49709
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
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=5.13
  2. Affected versionversion=cf68fffb66d60d96209446bfc4a15291dc5a5d41 <57cd6d157eb479f0a8e820fd36b7240845c8a937
  3. Affected versionversion=cf68fffb66d60d96209446bfc4a15291dc5a5d41 <75f3a5fa2ad049c85ab5d5ee1ed9cfaa7e62c5ed
  4. Affected versionversion=cf68fffb66d60d96209446bfc4a15291dc5a5d41 <ca3897f2ac02ceae5e6fa794f83c36f9885b93da

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=cf68fffb66d60d96209446bfc4a15291dc5a5d41 <57cd6d157eb479f0a8e820fd36b7240845c8a937; version=cf68fffb66d60d96209446bfc4a15291dc5a5d41 <75f3a5fa2ad049c85ab5d5ee1ed9cfaa7e62c5ed; version=cf68fffb66d60d96209446bfc4a15291dc5a5d41 <ca3897f2ac02ceae5e6fa794f83c36f9885b93da

Published CVSS scores

5.5UbuntuCVSS: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

T1499Endpoint Denial of Service

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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