CVE-2024-43870

Kernel memory exhaustion via leaked perf events

Published Aug 21, 2024 · Updated May 23, 2026

Resource leakage in affected Linux kernel versions allows local users to consume kernel memory through perf events during task exit. In event_sched_out(), a failed task_work_add() call is ignored after the event reference count is incremented, so free_event() cannot release the event. Reaching the race requires a pending SIGTRAP perf event to overlap task-work shutdown; repeated leaked references can exhaust memory and interrupt service.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leakage in affected Linux kernel versions allows local users to consume kernel memory through perf events during task exit. In event_sched_out(), a failed task_work_add() call is ignored after the event reference count is incremented, so free_event() cannot release the event. Reaching the race requires a pending SIGTRAP perf event to overlap task-work shutdown; repeated leaked references can exhaust memory and interrupt service.

The record

CVE
CVE-2024-43870
Published
Aug 21, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.15.84 <5.15.165
  2. Affected versionversion=517e6a301f34613bff24a8e35b5455884f2d83d8 <05d3fd599594abf79aad4484bccb2b26e1cb0b51
  3. Affected versionversion=517e6a301f34613bff24a8e35b5455884f2d83d8 <2fd5ad3f310de22836cdacae919dd99d758a1f1b
  4. Affected versionversion=517e6a301f34613bff24a8e35b5455884f2d83d8 <3d7a63352a93bdb8a1cdf29606bf617d3ac1c22a
  5. Affected versionversion=517e6a301f34613bff24a8e35b5455884f2d83d8 <70882d7fa74f0731492a0d493e8515a4f7131831
  6. Affected versionversion=6.0.14 <6.1
  7. Affected versionversion=6.1
  8. Affected versionversion=78e1317a174edbfd1182599bf76c092a2877672c
  9. Affected versionversion=8bffa95ac19ff27c8261904f89d36c7fcf215d59 <67fad724f1b568b356c1065d50df46e6b30eb2f7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15.84 <5.15.165; version=517e6a301f34613bff24a8e35b5455884f2d83d8 <05d3fd599594abf79aad4484bccb2b26e1cb0b51; version=517e6a301f34613bff24a8e35b5455884f2d83d8 <2fd5ad3f310de22836cdacae919dd99d758a1f1b; version=517e6a301f34613bff24a8e35b5455884f2d83d8 <3d7a63352a93bdb8a1cdf29606bf617d3ac1c22a; version=517e6a301f34613bff24a8e35b5455884f2d83d8 <70882d7fa74f0731492a0d493e8515a4f7131831; version=6.0.14 <6.1; version=6.1; version=78e1317a174edbfd1182599bf76c092a2877672c; version=8bffa95ac19ff27c8261904f89d36c7fcf215d59 <67fad724f1b568b356c1065d50df46e6b30eb2f7

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

CWE-401Missing Release of Memory after Effective Lifetime
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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