CVE-2026-43199

A flaw was found in the Linux kernel's net/mlx5e component. This vulnerability, identified as a "scheduling while atomic" bug, occurs when the mlx5e_ipsec_init_macs() function attempts to query the hardware for a MAC address in an atomic context, which can lead to the system attempting to sleep. A local attacker could potentially trigger this condition, leading to system instability or a kernel panic, resulting in a Denial of Service (DoS).

Red Hat acknowledges the upstream Linux kernel correction for «net/mlx5e» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent the mlx5_core module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.