UBUNTU-CVE-2026-97441: Medium severity ubuntu/linux vulnerability
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 HOSTCAP 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 ahciinitone() 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: requiredsize = 0x100 (global registers) + maxports 0x80 If requiredsize exceeds the actual BAR size, the probe fails with -ENODEV, preventing the panic and providing a clear error message. [cassel: commit log]
Affected Software
Remediation
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In ahci_init_one(), validate that the mapped BAR is large enough for the claimed number of ports before accessing port registers: calculate required_size = 0x100 (global registers) + max_ports * 0x80, and fail the probe with -ENODEV if required_size exceeds the actual BAR size.