CVE-2026-98251 Linux Kernel openvswitch - Use After Free

Linux kernel openvswitch contains a use-after-free vulnerability caused by reallocating confirmed conntrack labels in ovs_ct_get_conn_labels(), letting concurrent CPU access cause memory corruption, exploit requires concurrent access to conntrack entries.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version with the fix for openvswitch conntrack label handling.

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

← All CVEs