CVE-2026-64579

Local kernel panic via poisoned policy node

Published Aug 5, 2026 · Updated Aug 5, 2026

Expired-pointer dereference in the Linux kernel xfrm policy subsystem allows local users to trigger a kernel panic under memory pressure. An inverted guard in xfrm_hash_rebuild skips preallocation for inexact policies, and a failed GFP_ATOMIC insertion leaves a poisoned bydst node that the next rebuild dereferences. Exploitation requires low-privileged local access and induced allocation failure; the demonstrated consequence is a fatal availability interruption.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Expired-pointer dereference in the Linux kernel xfrm policy subsystem allows local users to trigger a kernel panic under memory pressure. An inverted guard in xfrm_hash_rebuild skips preallocation for inexact policies, and a failed GFP_ATOMIC insertion leaves a poisoned bydst node that the next rebuild dereferences. Exploitation requires low-privileged local access and induced allocation failure; the demonstrated consequence is a fatal availability interruption.

The record

CVE
CVE-2026-64579
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=24969facd704a5f0dd8e08da86bf32a9ce972bee <6aa3796d18a9fda953ad76a62b57bf6c145cb9ef
  2. Affected versionversion=24969facd704a5f0dd8e08da86bf32a9ce972bee <7acc5ed2f33608a3d83b64f50a5766843b6e2485
  3. Affected versionversion=24969facd704a5f0dd8e08da86bf32a9ce972bee <94c00391a5117530188334f740ce26d3f1256190
  4. Affected versionversion=24969facd704a5f0dd8e08da86bf32a9ce972bee <d9d9cc21cc90014724a14c447e3d587be9447107
  5. Affected versionversion=24969facd704a5f0dd8e08da86bf32a9ce972bee <f38f8cce2f7e79775b3db7e8a5eacda04ac908e4
  6. Affected versionversion=5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=24969facd704a5f0dd8e08da86bf32a9ce972bee <6aa3796d18a9fda953ad76a62b57bf6c145cb9ef; version=24969facd704a5f0dd8e08da86bf32a9ce972bee <7acc5ed2f33608a3d83b64f50a5766843b6e2485; version=24969facd704a5f0dd8e08da86bf32a9ce972bee <94c00391a5117530188334f740ce26d3f1256190; version=24969facd704a5f0dd8e08da86bf32a9ce972bee <d9d9cc21cc90014724a14c447e3d587be9447107; version=24969facd704a5f0dd8e08da86bf32a9ce972bee <f38f8cce2f7e79775b3db7e8a5eacda04ac908e4; version=5.0

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/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

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-825Expired Pointer Dereference
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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