High [CVE-2026-64078] add and use xtables_unregister_table_exit
This high-severity Red Hat Linux advisory covers CVE-2026-64078 affecting Red Hat Enterprise Linux 10, Shadow Migration Toolkit for Virtualization for RHEL 10, Red Hat package: kernel.
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Summary
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().
This vulnerability occurs when a userspace process attempts to re-instantiate a netfilter table after the module has been removed. Due to an incomplete unregistration process, the table cannot be properly re-established, potentially leading to a denial of service for network filtering functionalities.
This issue is resolved by ensuring a complete unregistration of the table. Red Hat severity: Moderate — CVSS 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H).
Weakness: CWE-459. Affected Red Hat products: Red Hat Enterprise Linux 10; Shadow Migration Toolkit for Virtualization for RHEL 10.
Affected products named by the advisory: Red Hat package: kernel.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
- kernel-0:6.12.0-211.63.1.el10_2
- RHSA-2026:76738
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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