CVE-2026-64078
In the Linux kernel, the following vulnerability has been resolved:
netfilter: x_tables: add and use xtables_unregister_table_exit
Previous change added xtables_unregister_table_pre_exit to detach the
table from the packetpath and to unlink it from the active table list.
In case of rmmod, userspace that is doing set/getsockopt for this table
will not be able to re-instantiate the table:
1. The larval table has been removed already
2. existing instantiated table is no longer on the xt pernet table list.
This adds the second stage helper:
unlink the table from the dying list, free the hook ops (if any) and do
the audit notification. It replaces xt_unregister_table().
CSIRTS triage
- What
- The vulnerability involves the addition and use of xtables_unregister_table_exit, which may lead to instability.
- Who is affected
- Deployments using the Netfilter framework in the Linux kernel.
- Urgency
- Remediation is critical due to the high CVSS score of 9.8, indicating severe potential impact.
- Action
- Apply the latest kernel patch that addresses CVE-2026-64078.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
Advisory coverage (7)
- unknownUSN-8664-1: Linux kernel (NVIDIA BaseOS) vulnerabilitiesubuntu · 2026-08-20
- unknownUSN-8663-1: Linux kernel (NVIDIA) vulnerabilitiesubuntu · 2026-08-20
- highUSN-8618-1: Linux kernel vulnerabilitiesubuntu · 2026-07-28
- highUSN-8603-1: Linux kernel (Azure) vulnerabilitiesubuntu · 2026-07-24
- highUSN-8593-1: Linux kernel vulnerabilitiesubuntu · 2026-07-23
- highCVE-2026-64078: In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: add a…nvd · 2026-07-19
- criticalCVE-2026-64078: netfilter: x_tables: add and use xtables_unregister_table_exitmsrc · 2026-07-14
External references
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