CVE-2026-64005

Local privilege escalation via SMC hash-list reinitialization

Published Jul 19, 2026 · Updated Jul 19, 2026

Race condition in the SMC subsystem of Linux Kernel allows local users to corrupt kernel memory during module initialization. The smc_init() path calls INIT_HLIST_HEAD after socket registration, resetting smc_v4_hashinfo.ht and smc_v6_hashinfo.ht while live entries can already use them. Concurrent unprivileged socket creation during SMC autoload can drive the race, causing kernel-memory disclosure, stale-pointer writes, privilege escalation, or a kernel panic.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the SMC subsystem of Linux Kernel allows local users to corrupt kernel memory during module initialization. The smc_init() path calls INIT_HLIST_HEAD after socket registration, resetting smc_v4_hashinfo.ht and smc_v6_hashinfo.ht while live entries can already use them. Concurrent unprivileged socket creation during SMC autoload can drive the race, causing kernel-memory disclosure, stale-pointer writes, privilege escalation, or a kernel panic.

The record

CVE
CVE-2026-64005
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=4.11
  2. Affected versionversion=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <0cc9d0ac22d02f1ba1884de5d6de9eaf8b45d82d
  3. Affected versionversion=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <2006605006e5a4a11d93e1ebdbbe95764d24276f
  4. Affected versionversion=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <55cba6b883b41e5922c00ba9d4e3262131f46f1b
  5. Affected versionversion=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <5ec939367e700722ffbb1b7cacccbb1a3cf0ebd1
  6. Affected versionversion=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <64c96e497d5ada0b90e99bf58f893aa2b73dcfbc
  7. Affected versionversion=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <9e4389b0038781f19f97895186ed941ff8ac1678
  8. Affected versionversion=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <cdc79c05cc375f68ae87b0c74fdaac1a5c93155a
  9. Affected versionversion=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <ed7a758313011885347b854e97cb95903ef3c3f7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.11; version=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <0cc9d0ac22d02f1ba1884de5d6de9eaf8b45d82d; version=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <2006605006e5a4a11d93e1ebdbbe95764d24276f; version=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <55cba6b883b41e5922c00ba9d4e3262131f46f1b; version=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <5ec939367e700722ffbb1b7cacccbb1a3cf0ebd1; version=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <64c96e497d5ada0b90e99bf58f893aa2b73dcfbc; version=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <9e4389b0038781f19f97895186ed941ff8ac1678; version=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <cdc79c05cc375f68ae87b0c74fdaac1a5c93155a; version=f16a7dd5cf27eeda187425c9c7d96802a549f9c4 <ed7a758313011885347b854e97cb95903ef3c3f7

Published CVSS scores

7.8LinuxCVSS: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 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

T1068Exploitation for Privilege Escalation

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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