Medium [CVE-2026-64077] move to two-stage removal scheme
This medium-severity Red Hat Linux advisory covers CVE-2026-64077 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat package: kernel.
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Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: move to two-stage removal scheme Like previous patches for x_tables, follow same pattern in ebtables.
We can't reuse xt helpers: ebt_table struct layout is incompatible. table->ops assignment is now done while still holding the ebt mutex to make sure we never expose partially-filled table struct.
A concurrency issue exists during the two-stage removal scheme where the `table->ops` assignment could expose a partially-filled table structure if the `ebt` mutex is not held. This could lead to unpredictable system behavior.
This vulnerability is rated as Moderate severity because exploitation is restricted to local attackers with privileges to configure bridge firewalling, and the primary impact is denial of service through kernel instability or crash rather than arbitrary code execution.
The flaw stems from improper locking when unregistering Ethernet bridge filter tables, exposing incomplete data structures to concurrent operations.
Because the underlying code sequence was introduced in newer kernel branches, older Red Hat Enterprise Linux releases are not affected, and typical enterprise deployments increasingly rely on nftables rather than legacy bridge filtering. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-413.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
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