CVE-2026-72487

Technical Description

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 = 0x000000009

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References