CVE-2026-89488 Linux Kernel openvswitch - Use After Free

Linux kernel openvswitch contains a use-after-free vulnerability caused by improper handling of CT limit state under RCU and ovs_mutex during netns teardown, letting unprivileged users trigger slab-use-after-free in ovs_ct_execute(), exploit requires user and network namespace access.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.13% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for CT limit teardown use-after-free.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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