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

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Summary

CVECVE-2026-80651
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:50 UTC
Updated2026-08-28 08:16:50 UTC
DescriptionIn 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 callers where pdev->bus is non-NULL, which is the only case where dsm_create() did meaningful work before this change.

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.049990000 (date 2026-08-30)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4be423572da1f4c11f45168e3fafda870ddac9f8 6bafd740095fb3d0e9a00540bc8f3484c38e6f85 git Not specified
CNA Linux Linux affected 4be423572da1f4c11f45168e3fafda870ddac9f8 930d9d36ea618a775985446a125aedeb401db522 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6bafd740095fb3d0e9a00540bc8f3484c38e6f85 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/930d9d36ea618a775985446a125aedeb401db522 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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