CVE-2024-26765

Service interruption via enabled IRQ during CPU hotplug

Published Apr 3, 2024 · Updated May 11, 2026

An IRQ-state flaw in the Linux kernel allows local users to interrupt LoongArch secondary-CPU initialization during hotplug. In arch/loongarch/kernel/smp.c, arch_cpu_idle_dead invokes the restart init_fn while interrupts remain enabled, allowing an unexpected interrupt before startup state is ready. Reachability requires a LoongArch system with CPU hotplug and local access; the documented result is an RCU warning and service interruption.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An IRQ-state flaw in the Linux kernel allows local users to interrupt LoongArch secondary-CPU initialization during hotplug. In arch/loongarch/kernel/smp.c, arch_cpu_idle_dead invokes the restart init_fn while interrupts remain enabled, allowing an unexpected interrupt before startup state is ready. Reachability requires a LoongArch system with CPU hotplug and local access; the documented result is an RCU warning and service interruption.

The record

CVE
CVE-2024-26765
Published
Apr 3, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 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=5.19
  2. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <1001db6c42e4012b55e5ee19405490f23e033b5a
  3. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <8bf2ca8c60712af288b88ba80f8e4df4573d923f
  4. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <a262b78dd085dbe9b3c75dc1d9c4cd102b110b53
  5. Affected versionversion=fa96b57c149061f71a70bd6582d995f6424fbbf4 <dffdf7c783ef291eef38a5a0037584fd1a7fa464

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <1001db6c42e4012b55e5ee19405490f23e033b5a; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <8bf2ca8c60712af288b88ba80f8e4df4573d923f; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <a262b78dd085dbe9b3c75dc1d9c4cd102b110b53; version=fa96b57c149061f71a70bd6582d995f6424fbbf4 <dffdf7c783ef291eef38a5a0037584fd1a7fa464

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

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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