CVE-2026-64229

Local system crash via invalid broadcast TLB flush

Published Jul 24, 2026 · Updated Jul 24, 2026

Denial of service in Linux Kernel allows local users to crash affected x86 systems through ordinary memory activity on affected releases. With nopcid active on an AMD CPU supporting INVLPGB, consider_global_asid assigns a nonzero PCID and flush_tlb_mm_range issues INVLPGB while CR4.PCIDE is clear. The path requires an address space active on more than three CPUs; the resulting general-protection fault produces a kernel oops and interrupts the system.

CVSS severity5.5
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

Denial of service in Linux Kernel allows local users to crash affected x86 systems through ordinary memory activity on affected releases. With nopcid active on an AMD CPU supporting INVLPGB, consider_global_asid assigns a nonzero PCID and flush_tlb_mm_range issues INVLPGB while CR4.PCIDE is clear. The path requires an address space active on more than three CPUs; the resulting general-protection fault produces a kernel oops and interrupts the system.

The record

CVE
CVE-2026-64229
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

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=4afeb0ed1753ebcad93ee3b45427ce85e9c8ec40 <44126343d58c68adaa8343fbf1c07dd20078c35e
  2. Affected versionversion=4afeb0ed1753ebcad93ee3b45427ce85e9c8ec40 <d2d6d21286719b454d5d87a8758c23d2377d88a2
  3. Affected versionversion=4afeb0ed1753ebcad93ee3b45427ce85e9c8ec40 <fed725cace3ab1c4f7f8182e35029a603d953187
  4. Affected versionversion=6.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4afeb0ed1753ebcad93ee3b45427ce85e9c8ec40 <44126343d58c68adaa8343fbf1c07dd20078c35e; version=4afeb0ed1753ebcad93ee3b45427ce85e9c8ec40 <d2d6d21286719b454d5d87a8758c23d2377d88a2; version=4afeb0ed1753ebcad93ee3b45427ce85e9c8ec40 <fed725cace3ab1c4f7f8182e35029a603d953187; version=6.15

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-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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