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CVE PROGRAM SOURCE RECORD7.7 High

CVE-2026-72487

PCI: Check ROM header and data structure addr before accessing

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Status
Published
Published
Updated
Assigning organization
Linux

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 = 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]

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 47b975d234eac39f3a72e5496d5f6158d8b806d1 to < cd5b242d5848369b9e957340a7e30adee7b6763daffected
  • 47b975d234eac39f3a72e5496d5f6158d8b806d1 to < 4997873e3abbad47a9e1e4abd05f045f77a74f22affected
  • 47b975d234eac39f3a72e5496d5f6158d8b806d1 to < 724042f8f98d2594b9d164549fd4292c6bd58120affected
  • 47b975d234eac39f3a72e5496d5f6158d8b806d1 to < 1d495446ec7ace5b61da366ffb161ee8319dd9a2affected
  • 47b975d234eac39f3a72e5496d5f6158d8b806d1 to < 721ad5b72448b5065ed309017ab563205f162404affected
  • 47b975d234eac39f3a72e5496d5f6158d8b806d1 to < 538796b807fcfb81b2ce40cc97a614fd8588feb5affected

Linux Linux

Default version status: affected

  • 4.5affected
  • 0 to < 4.5unaffected
  • 6.1.178 to ≤ 6.1.*unaffected
  • 6.6.145 to ≤ 6.6.*unaffected
  • 6.12.97 to ≤ 6.12.*unaffected
  • 6.18.40 to ≤ 6.18.*unaffected
  • 7.1.5 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References