CVE-2026-64077
Description
A flaw was found in the Linux kernel's netfilter ebtables component. 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.
Statement
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.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | 7.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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