CVE-2024-49926

Kernel panic via nonexistent per-CPU RCU access

Published Oct 21, 2024 · Updated May 11, 2026

Denial of service in affected Linux kernels allows local users to trigger a system panic on CONFIG_FORCE_NR_CPUS builds. The rcu_tasks_need_gpcb() path sizes enqueue and dequeue limits with nr_cpu_ids, then reaches a nonexistent per-CPU rtpcp slot when CPU-number holes exist. The flaw requires that build option and a sparse possible-CPU map; triggering it crashes the kernel and interrupts all services on the host.

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

Denial of service in affected Linux kernels allows local users to trigger a system panic on CONFIG_FORCE_NR_CPUS builds. The rcu_tasks_need_gpcb() path sizes enqueue and dequeue limits with nr_cpu_ids, then reaches a nonexistent per-CPU rtpcp slot when CPU-number holes exist. The flaw requires that build option and a sparse possible-CPU map; triggering it crashes the kernel and interrupts all services on the host.

The record

CVE
CVE-2024-49926
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 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=5.17
  2. Affected versionversion=8610b65680390a103b58f46282a1b05f7eebbba4 <05095271a4fb0f6497121a057f9a2edf386d5d96
  3. Affected versionversion=8610b65680390a103b58f46282a1b05f7eebbba4 <3104bddc666ff64b90491868bbc4c7ebdd90aedf
  4. Affected versionversion=8610b65680390a103b58f46282a1b05f7eebbba4 <b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf
  5. Affected versionversion=8610b65680390a103b58f46282a1b05f7eebbba4 <fd70e9f1d85f5323096ad313ba73f5fe3d15ea41

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.17; version=8610b65680390a103b58f46282a1b05f7eebbba4 <05095271a4fb0f6497121a057f9a2edf386d5d96; version=8610b65680390a103b58f46282a1b05f7eebbba4 <3104bddc666ff64b90491868bbc4c7ebdd90aedf; version=8610b65680390a103b58f46282a1b05f7eebbba4 <b3b2431ed27f4ebc28e26cdf005c1de42dc60bdf; version=8610b65680390a103b58f46282a1b05f7eebbba4 <fd70e9f1d85f5323096ad313ba73f5fe3d15ea41

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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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