CVE-2026-64458Public exploit

Kernel crash via unchecked DAMON intervals

Published Jul 25, 2026 · Updated Jul 25, 2026

Improper interval handling in the Linux Kernel DAMON subsystem allows local users with sysfs write access to crash the kernel. damon_max_nr_accesses() divides by zero or returns a zero denominator for zero intervals, while damon_hot_score() fails to bound scores from very large intervals before indexing regions_score_histogram. Exploitation requires privileged DAMON sysfs write access and results in a divide-error kernel oops or an out-of-bounds array access.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper interval handling in the Linux Kernel DAMON subsystem allows local users with sysfs write access to crash the kernel. damon_max_nr_accesses() divides by zero or returns a zero denominator for zero intervals, while damon_hot_score() fails to bound scores from very large intervals before indexing regions_score_histogram. Exploitation requires privileged DAMON sysfs write access and results in a divide-error kernel oops or an out-of-bounds array access.

The record

CVE
CVE-2026-64458
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-369, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <35d4a3cf70a855b50e53189ac2f8463e20a02046
  2. Affected versionversion=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <58321b4e6e4f0f412069ab27ccdd56292757343a
  3. Affected versionversion=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <74fef68d521150281e36cdaa20e9e1ee3e3aa146
  4. Affected versionversion=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <76e415ea88d20f022ed5cfcf78c50e156a267e91
  5. Affected versionversion=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <9c8f31eaae6140ecadec0c07320498a944556de2
  6. Affected versionversion=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a
  7. Affected versionversion=5.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <35d4a3cf70a855b50e53189ac2f8463e20a02046; version=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <58321b4e6e4f0f412069ab27ccdd56292757343a; version=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <74fef68d521150281e36cdaa20e9e1ee3e3aa146; version=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <76e415ea88d20f022ed5cfcf78c50e156a267e91; version=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <9c8f31eaae6140ecadec0c07320498a944556de2; version=198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f <ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a; version=5.16

Published CVSS scores

6.0Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
5.5Red HatCVSS: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

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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 exploitPublished

Weakness, pattern, technique

CWE-369Divide By Zero
T1499Endpoint Denial of Service

Public exploit references

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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