CVE-2026-72487

Status: UPDATED  |  Advisory ID: CVE-2026-72487

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

PCI: Check ROM header and data structure addr before accessing

We meet a crash when running stress-ng on x86_64 machine:

BUG: unable to handle page fault for address: ffa0000007f40000

RIP: 0010:pci_get_rom_size+0x52/0x220

Call Trace:

<TASK>

pci_map_rom+0x80/0x130

pci_read_rom+0x4b/0xe0

kernfs_file_read_iter+0x96/0x180

vfs_read+0x1b1/0x300

Our analysis reveals that the ROM space's start address is

0xffa0000007f30000, and size is 0x10000. Because of broken ROM space,

before calling readl(pds), the pds's value is 0xffa0000007f3ffff, which is

already pointed to the ROM space end, invoking readl() would read 4 bytes

therefore cause an out-of-bounds access and trigger a crash. Fix this by

adding image header and data structure checking.

We also found another crash on arm64 machine:

Unable to handle kernel paging request at virtual address ffff8000dd1393ff

Mem abort info:

ESR = 0x0000000096000021

EC = 0x25: DABT (current EL), IL = 32 bits

SET = 0, FnV = 0

EA = 0, S1PTW = 0

FSC = 0x21: alignment fault

The call trace is the same with x86_64, but the crash reason is that the

data structure addr is not aligned with 4, and arm64 machine report

"alignment fault". Fix this by adding alignment checking.

[bhelgaas: shorten function names, wrap comments] (NVD)

What to Do

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

References