CVE-2026-64189

Local kernel panic via unsynchronized ipset array access

Published Jul 20, 2026 · Updated Jul 20, 2026

Race condition in affected Linux Kernel releases allows local users to panic the kernel through concurrent ipset netlink operations. The ip_set_dump_do() and ip_set_dump_done() paths dereference inst->ip_set_list outside an RCU read-side section while ip_set_create() can replace and free that array. A local user able to issue the relevant netlink operations must win the resize-versus-dump timing window; the demonstrated consequence is a fatal kernel crash.

CVSS severity7.8
High
EPSS probability0.10%
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 affected Linux Kernel releases allows local users to panic the kernel through concurrent ipset netlink operations. The ip_set_dump_do() and ip_set_dump_done() paths dereference inst->ip_set_list outside an RCU read-side section while ip_set_create() can replace and free that array. A local user able to issue the relevant netlink operations must win the resize-versus-dump timing window; the demonstrated consequence is a fatal kernel crash.

The record

CVE
CVE-2026-64189
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 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=2f6bf7917f55f9dae913193e49672b3598620eab
  2. Affected versionversion=4.19.5 <4.20
  3. Affected versionversion=4.20
  4. Affected versionversion=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <7cd9103283b26b917360ec99d7d2f2d761bcf1ab
  5. Affected versionversion=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <81d54c766337b923eec26da0a13406760b091093
  6. Affected versionversion=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <e8ee198bbc04a32d336e79160fde980e0235b39f
  7. Affected versionversion=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <ff86ea9b7fdf70564e60436fbee68c96bc459943

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2f6bf7917f55f9dae913193e49672b3598620eab; version=4.19.5 <4.20; version=4.20; version=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <7cd9103283b26b917360ec99d7d2f2d761bcf1ab; version=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <81d54c766337b923eec26da0a13406760b091093; version=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <e8ee198bbc04a32d336e79160fde980e0235b39f; version=8a02bdd50b2ecb6d62121d2958d3ea186cc88ce7 <ff86ea9b7fdf70564e60436fbee68c96bc459943

Published CVSS scores

7.8kernel.orgCVSS: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Application or System Exploitation

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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