CVE-2026-43466

A flaw was found in the Linux kernel's mlx5e network driver. During a transmit (TX) error recovery process, a desynchronization occurs in the Direct Memory Access (DMA) First-In, First-Out (FIFO) buffer. This desynchronization causes the system to incorrectly unmap memory addresses, which can lead to memory corruption. This issue could result in a system crash, causing a denial of service.

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.