CVE-2023-54257
kernel: Linux kernel: macb Ethernet driver memory corruption leads to denial of service.
Severity
CriticalRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · December 30, 2025
Updated · August 21, 2026
Description
A flaw was found in the Linux kernel's macb Ethernet driver. In extended buffer descriptor mode, the driver incorrectly handles a bit in the receive buffer descriptor, causing it to attempt to free Direct Memory Access (DMA) memory it did not allocate. This memory corruption can lead to a sudden and permanent failure of networking and multimedia card (MMC) functionality, resulting in a denial of service.
CVSS score applicability
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.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-763 · Release of Invalid Pointer or Reference