Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-05-01T00:00:00 kernel: net/mlx5: Fix switchdev mode rollback in case of failure 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-372

A flaw was found in the Linux kernel's `net/mlx5` driver. This vulnerability occurs when the `switchdev` mode fails to initialize or transition correctly, leading to an improper rollback to legacy mode. During this rollback, the system attempts to unregister an already unregistered uplink network device, which can cause a kernel panic. A local attacker or process could exploit this flaw to trigger a system crash, resulting in a Denial of Service (DoS).

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Out of support scope kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-43012 https://nvd.nist.gov/vuln/detail/CVE-2026-43012 https://lore.kernel.org/linux-cve-announce/2026050155-CVE-2026-43012-a6fd@gregkh/T