CVE-2024-31076

Service interruption via unreclaimed CPU interrupt vectors

Published Jun 21, 2024 · Updated May 11, 2026

Resource exhaustion in the Linux kernel allows local users to interrupt service by leaking x86 CPU interrupt vectors during CPU offlining. When affinity migration is deferred, irq_needs_fixup() can bypass irq_force_complete_move(), and later cleanup clears prev_vector without reclaiming it from vector_matrix. The race requires the old CPU to go offline before the interrupt fires on its new CPU, and repeated leaks can exhaust available vectors.

CVSS severity5.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in the Linux kernel allows local users to interrupt service by leaking x86 CPU interrupt vectors during CPU offlining. When affinity migration is deferred, irq_needs_fixup() can bypass irq_force_complete_move(), and later cleanup clears prev_vector without reclaiming it from vector_matrix. The race requires the old CPU to go offline before the interrupt fires on its new CPU, and repeated leaks can exhaust available vectors.

The record

CVE
CVE-2024-31076
Published
Jun 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. Jun 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=4.13
  2. Affected versionversion=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <59f86a2908380d09cdc726461c0fbb8d8579c99f
  3. Affected versionversion=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <6752dfcfff3ac3e16625ebd3f0ad9630900e7e76
  4. Affected versionversion=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <9eeda3e0071a329af1eba15f4e57dc39576bb420
  5. Affected versionversion=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <a40209d355afe4ed6d533507838c9e5cd70a76d8
  6. Affected versionversion=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <a6c11c0a5235fb144a65e0cb2ffd360ddc1f6c32
  7. Affected versionversion=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <e9c96d01d520498b169ce734a8ad1142bef86a30
  8. Affected versionversion=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <ebfb16fc057a016abb46a9720a54abf0d4f6abe1
  9. Affected versionversion=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <f5f4675960609d8c5ee95f027fbf6ce380f98372

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.13; version=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <59f86a2908380d09cdc726461c0fbb8d8579c99f; version=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <6752dfcfff3ac3e16625ebd3f0ad9630900e7e76; version=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <9eeda3e0071a329af1eba15f4e57dc39576bb420; version=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <a40209d355afe4ed6d533507838c9e5cd70a76d8; version=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <a6c11c0a5235fb144a65e0cb2ffd360ddc1f6c32; version=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <e9c96d01d520498b169ce734a8ad1142bef86a30; version=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <ebfb16fc057a016abb46a9720a54abf0d4f6abe1; version=f0383c24b4855f6a4b5a358c7b2d2c16e0437e9b <f5f4675960609d8c5ee95f027fbf6ce380f98372

Published CVSS scores

5.5CanonicalCVSS: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

T1499.004Application 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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