Kernel memory compromise via premature sockopt exposure
Published Jul 19, 2026 · Updated Jul 19, 2026
Race condition in affected Linux Kernel releases allows local users to read or modify kernel memory or crash the system through ebtables. The ebtables_init function exposes its setsockopt and getsockopt handlers before registering per-network-namespace state, so concurrent calls can treat an invalid net_generic value as a pointer. Exploitation requires CAP_NET_ADMIN, obtainable in an unprivileged user namespace, and winning the module-load race; successful access can corrupt kernel state or cause an oops or panic.
Summary
What happened
Race condition in affected Linux Kernel releases allows local users to read or modify kernel memory or crash the system through ebtables. The ebtables_init function exposes its setsockopt and getsockopt handlers before registering per-network-namespace state, so concurrent calls can treat an invalid net_generic value as a pointer. Exploitation requires CAP_NET_ADMIN, obtainable in an unprivileged user namespace, and winning the module-load race; successful access can corrupt kernel state or cause an oops or panic.
The record
- CVE
- CVE-2026-64076
- Published
- Jul 19, 2026
- Updated
- Jul 19, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-820, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 19, 2026CVE publishedPublication date reported by the CVE source.
- 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.
- Affected versionversion=5.13
- Affected versionversion=5b53951cfc85329d29df9d07b1e905f4563546a5 <02d999dc69b3918dba2414932b5d95f1f75c76cb
- Affected versionversion=5b53951cfc85329d29df9d07b1e905f4563546a5 <27414ff1b287ea9a2a11675149ec28e05539f3cc
- Affected versionversion=5b53951cfc85329d29df9d07b1e905f4563546a5 <c647e2a21bbbaceda6cdb8a44a56f44d231dc4b4
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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