CVE-2026-80651

/// Technical description

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

crypto: ccp/sev-dev-tsm - bail out early when pdev->bus is NULL

dsm_create() initially checks pdev->bus when computing segment_id:

u8 segment_id = pdev->bus ? pci_domain_nr(pdev->bus) : 0;

But the next two lines unconditionally dereference pdev->bus via

pcie_find_root_port() and especially pci_dev_id(pdev), which expands

to PCI_DEVID(dev->bus->number, dev->devfn). If pdev->bus is in fact

NULL, segment_id is initialised to 0 but the very next statement

crashes the kernel.

smatch flags this:

drivers/crypto/ccp/sev-dev-tsm.c:253 dsm_create() error: we

previously assumed 'pdev->bus' could be null (see line 251)

Make the NULL handling consistent: if pdev->bus is NULL the device

has no PCI context to work with and SEV TIO setup cannot proceed,

so return -ENODEV before any of the bus-dependent lookups. The

remaining initialisation now runs only on the path where pdev->bus

is known to be valid.

No change for cal

/// 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