Kernel memory corruption via conntrack teardown race
Published May 9, 2024 · Updated Aug 5, 2026
Use-after-free in Linux kernel Open vSwitch conntrack from 4.18 allows local users to access freed memory during subsystem teardown. ovs_ct_limit_exit traverses entries with hlist_for_each_entry_rcu while kfree_rcu can complete outside an RCU read-side critical section and free the current key. Local low-privilege access is required; successful exploitation can read or alter kernel memory or crash the system.
Summary
What happened
Use-after-free in Linux kernel Open vSwitch conntrack from 4.18 allows local users to access freed memory during subsystem teardown. ovs_ct_limit_exit traverses entries with hlist_for_each_entry_rcu while kfree_rcu can complete outside an RCU read-side critical section and free the current key. Local low-privilege access is required; successful exploitation can read or alter kernel memory or crash the system.
The record
- CVE
- CVE-2024-27395
- Published
- May 9, 2024
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-416
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 9, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=0 <*
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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