PT-2026-86185 · Linux · Linux

CVE-2026-80894

Publicado

2026-09-04

Atualizado

2026-09-04

Nenhuma

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

iommufd: Fix wrong hwpt passed to iommufd auto response faults on replace

iommufd hwpt replace device() calls:

iommufd auto response faults(hwpt, old handle);

passing the new hwpt together with the handle of the device's old domain. This should be a parameter mismatch:

Semantically, iommufd auto response faults(x, handle) scans x->fault's deliver list and response xarray for groups matching "handle". A group is queued under the hwpt that was attached at fault-delivery time. old handle is fetched before the domain switch, so its group lives on old->fault, not on the new hwpt->fault.
Historically, the first argument was "old". The routine was introduced by commit b7d8833677ba ("iommufd: Fault-capable hwpt attach/detach/replace") as fault domain replace dev() in fault.c, correctly calling iommufd auto response faults(old, curr). Commit fb21b1568ada ("iommufd: Make attach handle generic than fault specific") moved this into iommufd hwpt replace device() in device.c and swapped it to "hwpt". This should be a refactor regression, not an intentional change.

Fix this by passing "old" instead.

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CVE-2026-80894

Linux