CVE-2024-46797

Hard lockup via stale MCS queue node

Published Sep 18, 2024 · Updated May 11, 2026

Race condition in the PowerPC qspinlock code in the Linux kernel allows local users to trigger a hard lockup under lock contention. queued_spin_lock_slowpath increments qnodesp->count before initializing node->lock, so an interrupt can leave a stale lock value that makes get_tail_qnode update the wrong node's next pointer. The condition requires PowerPC queued spinlocks, contended locks, and precisely timed interrupt handling; the affected CPU can then spin indefinitely and stall the system.

CVSS severity5.5
Medium
EPSS probability0.16%
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 the PowerPC qspinlock code in the Linux kernel allows local users to trigger a hard lockup under lock contention. queued_spin_lock_slowpath increments qnodesp->count before initializing node->lock, so an interrupt can leave a stale lock value that makes get_tail_qnode update the wrong node's next pointer. The condition requires PowerPC queued spinlocks, contended locks, and precisely timed interrupt handling; the affected CPU can then spin indefinitely and stall the system.

The record

CVE
CVE-2024-46797
Published
Sep 18, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2024CVE 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=6.2
  2. Affected versionversion=84990b169557428c318df87b7836cd15f65b62dc <734ad0af3609464f8f93e00b6c0de1e112f44559
  3. Affected versionversion=84990b169557428c318df87b7836cd15f65b62dc <d84ab6661e8d09092de9b034b016515ef9b66085
  4. Affected versionversion=84990b169557428c318df87b7836cd15f65b62dc <f06af737e4be28c0e926dc25d5f0a111da4e2987

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=84990b169557428c318df87b7836cd15f65b62dc <734ad0af3609464f8f93e00b6c0de1e112f44559; version=84990b169557428c318df87b7836cd15f65b62dc <d84ab6661e8d09092de9b034b016515ef9b66085; version=84990b169557428c318df87b7836cd15f65b62dc <f06af737e4be28c0e926dc25d5f0a111da4e2987

Published CVSS scores

5.5NISTCVSS: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

CWE-667Improper Locking

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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