Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-08-15T00:00:00 kernel: fpga: microchip-spi: fix zero header_size OOB read in mpf_ops_parse_header() 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-125

In the Linux kernel, the following vulnerability has been resolved: fpga: microchip-spi: fix zero header_size OOB read in mpf_ops_parse_header() mpf_ops_parse_header() reads header_size from the bitstream at MPF_HEADER_SIZE_OFFSET (24). When header_size is zero, the expression *(buf + header_size - 1) reads one byte before the buffer start. Since initial_header_size is set to 71 in mpf_ops, the fpga-mgr core guarantees the buffer is large enough to reach MPF_HEADER_SIZE_OFFSET. The only real gap is the zero header_size case, which cannot be resolved by providing a larger buffer, so return -EINVAL.

A flaw was found in the Linux kernel's microchip-spi Field-Programmable Gate Array (FPGA) module. This vulnerability occurs in the `mpf_ops_parse_header()` function when processing a bitstream. If a crafted bitstream sets the `header_size` to zero, the function attempts to read data from memory before the allocated buffer, leading to an out-of-bounds read. This could potentially allow a local attacker to gain access to sensitive information or cause a denial of service.

Red Hat Enterprise Linux 10 Not affected kernel Red Hat Enterprise Linux 6 Not affected 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 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-72156 https://nvd.nist.gov/vuln/detail/CVE-2026-72156 https://lore.kernel.org/linux-cve-announce/2026081535-CVE-2026-72156-0591@gregkh/T