Local privilege escalation via timed anonymous sets
Published Mar 21, 2024 · Updated Aug 5, 2026
Use-after-free in Linux nf_tables on affected kernels allows local users to gain kernel privileges through timed anonymous sets. nf_tables_deactivate_set leaves the set live, allowing transaction teardown and garbage collection to deactivate the same expired element twice. A local user can obtain CAP_NET_ADMIN in a user namespace; successful exploitation leaks kernel pointers and corrupts kernel objects.
Summary
What happened
Use-after-free in Linux nf_tables on affected kernels allows local users to gain kernel privileges through timed anonymous sets. nf_tables_deactivate_set leaves the set live, allowing transaction teardown and garbage collection to deactivate the same expired element twice. A local user can obtain CAP_NET_ADMIN in a user namespace; successful exploitation leaks kernel pointers and corrupts kernel objects.
The record
- CVE
- CVE-2024-26642
- Published
- Mar 21, 2024
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-20, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 21, 2024CVE publishedPublication date reported by the CVE source.
- 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?
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- Affected versionversion=0 <*
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
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Weakness, pattern, technique
Public exploit references
- kernelCTF mitigation-instance exploitfunctional · demonstrated
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Reported exploitation
- kernelCTF mitigation-instance exploit chainexploit chain
Technologies
Your stack
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Your stack
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