CVE-2026-64417

Kernel panic via unchecked shrinker callback

Published Jul 25, 2026 · Updated Jul 25, 2026

NULL pointer dereference in the Linux Kernel shrinker debugfs interface allows local users to panic the kernel through file writes. shrinker_debugfs_add() unconditionally creates count and scan files when the corresponding shrinker callback is NULL, so a write calls a NULL function pointer. The path requires local high privileges and an affected shrinker, such as xen-backend; successful exploitation crashes the running kernel without affecting data confidentiality or integrity.

CVSS severity4.4
Medium
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

NULL pointer dereference in the Linux Kernel shrinker debugfs interface allows local users to panic the kernel through file writes. shrinker_debugfs_add() unconditionally creates count and scan files when the corresponding shrinker callback is NULL, so a write calls a NULL function pointer. The path requires local high privileges and an affected shrinker, such as xen-backend; successful exploitation crashes the running kernel without affecting data confidentiality or integrity.

The record

CVE
CVE-2026-64417
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
admin

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=6.0
  2. Affected versionversion=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <006467ab932698612398f853344a7405164541f4
  3. Affected versionversion=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <09d2407985b8ce3e831f9d4310fe7ac06a6b3ae9
  4. Affected versionversion=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <36f8534f461222291a74156ab91f3ba9f09b6f93
  5. Affected versionversion=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <b9beed2322f3538b0d2d53307062da4102b8d8d8
  6. Affected versionversion=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <e30453c61e185e914fde83c650e268067b140218
  7. Affected versionversion=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <ebb45c2648b1f60715fd283700f651e05e431231

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.0; version=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <006467ab932698612398f853344a7405164541f4; version=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <09d2407985b8ce3e831f9d4310fe7ac06a6b3ae9; version=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <36f8534f461222291a74156ab91f3ba9f09b6f93; version=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <b9beed2322f3538b0d2d53307062da4102b8d8d8; version=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <e30453c61e185e914fde83c650e268067b140218; version=bbf535fd6f06b94b9d07ed6f09397a936d4a58d8 <ebb45c2648b1f60715fd283700f651e05e431231

Published CVSS scores

4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/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 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 exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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