CVE-2026-64239Public exploit

Kernel memory corruption via delayed kobject release

Published Jul 24, 2026 · Updated Jul 24, 2026

Use-after-free in Linux Kernel DAMON sysfs allows local users to corrupt kernel memory by refreshing tried-region directories. damon_sysfs_scheme_regions_rm_dirs() drops kobject references but leaves region nodes linked until delayed release callbacks, so refresh can rebuild the list around objects pending deallocation. Reachability requires privileged DAMON sysfs access on a kernel built with CONFIG_DEBUG_KOBJECT_RELEASE; repeated refreshes can corrupt the list and trigger a refcount underflow or use-after-free.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel DAMON sysfs allows local users to corrupt kernel memory by refreshing tried-region directories. damon_sysfs_scheme_regions_rm_dirs() drops kobject references but leaves region nodes linked until delayed release callbacks, so refresh can rebuild the list around objects pending deallocation. Reachability requires privileged DAMON sysfs access on a kernel built with CONFIG_DEBUG_KOBJECT_RELEASE; repeated refreshes can corrupt the list and trigger a refcount underflow or use-after-free.

The record

CVE
CVE-2026-64239
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 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=6.2
  2. Affected versionversion=9277d0367ba18ef4bb98bafb1209e715844cdf7e <0ba6c05156d9ff9fc6ca22b7690e2eec9eca66f7
  3. Affected versionversion=9277d0367ba18ef4bb98bafb1209e715844cdf7e <2c33177023c92e76806c535ddbffaa3d3fc37777
  4. Affected versionversion=9277d0367ba18ef4bb98bafb1209e715844cdf7e <441f92f7d386b85bad16de49db95a307cba048a2
  5. Affected versionversion=9277d0367ba18ef4bb98bafb1209e715844cdf7e <a5fa42214de55e43d165144727ce9facb9fc6b08
  6. Affected versionversion=9277d0367ba18ef4bb98bafb1209e715844cdf7e <c0e37017a452addec873865c94cf7a665663a9b2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.2; version=9277d0367ba18ef4bb98bafb1209e715844cdf7e <0ba6c05156d9ff9fc6ca22b7690e2eec9eca66f7; version=9277d0367ba18ef4bb98bafb1209e715844cdf7e <2c33177023c92e76806c535ddbffaa3d3fc37777; version=9277d0367ba18ef4bb98bafb1209e715844cdf7e <441f92f7d386b85bad16de49db95a307cba048a2; version=9277d0367ba18ef4bb98bafb1209e715844cdf7e <a5fa42214de55e43d165144727ce9facb9fc6b08; version=9277d0367ba18ef4bb98bafb1209e715844cdf7e <c0e37017a452addec873865c94cf7a665663a9b2

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

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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