CVE-2026-97441

Status: UPDATED  |  Advisory ID: CVE-2026-97441

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

ata: ahci: fail probe if BAR too small for claimed ports

When an AHCI controller is disabled in BIOS, its HOST_CAP register may

contain a bogus value, e.g. 0xFFFFFFFF.

Since CAP.NP (Number of Ports) is a zeroes based 5-bit register field,

a value of 0x1f means 32 ports. If CAP.NP claims more ports than can

physically fit within the mapped BAR region, accessing port registers

beyond the BAR boundary causes a kernel panic.

Add validation in ahci_init_one() to check that the BAR size is

sufficient for the number of ports claimed in CAP.NP. The check

calculates the required MMIO size as:

required_size = 0x100 (global registers) + max_ports * 0x80

If required_size exceeds the actual BAR size, the probe fails with

-ENODEV, preventing the panic and providing a clear error message.

[cassel: commit log] (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References