CVE-2026-64460

Status: UPDATED  |  Advisory ID: CVE-2026-64460

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

PCI/IOV: Skip VF Resizable BAR restore on read error

sriov_restore_vf_rebar_state() uses the VF Resizable BAR Control register

to decide how many VF BARs to restore (nbars) and which VF BAR each

iteration addresses (bar_idx). bar_idx indexes into dev->sriov->barsz[],

which has only PCI_SRIOV_NUM_BARS (6) entries.

When a device does not respond, config reads typically return

PCI_ERROR_RESPONSE (~0). Both fields are 3 bits wide, so nbars and bar_idx

both evaluate to 7. The barsz[] access then goes out of bounds. UBSAN

reports this as:

UBSAN: array-index-out-of-bounds in drivers/pci/iov.c:948:51 index 7 is out of range for type 'resource_size_t [6]'

Observed on an NVIDIA RTX PRO 1000 GPU (GB207GLM) that stopped responding

during a failed GC6 power state exit. The subsequent pci_restore_state()

invoked sriov_restore_vf_rebar_state() while config reads returned

0xffffffff, triggering the splat.

Bail out if any VF Resizable BAR Control read returns PCI_ERROR_RESPONSE.

No further VF BARs are touched, which is safe because a config read that

returns PCI_ERROR_RESPONSE indicates the device is unreachable and

restoration is pointless. This mirrors the guard in

pci_restore_rebar_state(). (NVD)

What to Do

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

References