CVE-2024-27395: net: openvswitch: Fix Use-After-Free in ovs_ct_exit

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-14 · updated 2026-10-15
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: Fix Use-After-Free in ovs_ct_exit Since kfree_rcu, which is called in the hlist_for_each_entry_rcu traversal of ovs_ct_limit_exit, is not part of the RCU read critical section, it is possible that the RCU grace period will pass during the traversal and the key will be free. To prevent this, it should be changed to hlist_for_each_entry_safe.

Affected products

Debian Linux: 10.0
Linux kernel: from 4.18 before 4.19.313; from 4.20 before 5.4.275; from 5.5 before 5.10.216; from 5.11 before 5.15.158; from 5.16 before 6.1.90; from 6.2 before 6.6.30 — fixed in 4.19.313, 5.10.216, 5.15.158, 5.4.275, 6.1.90, 6.6.30

How to fix

Upgrade to a fixed version: Linux kernel 4.19.313, 5.10.216, 5.15.158, 5.4.275. Check the vendor advisory for mitigations.

References

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