CVE-2026-90429

/// Technical description

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

iommu/tegra241-cmdqv: Synchronize the error ISR against VINTF (de)init

A user VINTF is torn down by tegra241_cmdqv_deinit_vintf(), which runs from

the destroy callback and from the init-failure unwind in the alloc handler.

It clears the cmdqv->vintfs[] slot and lets the iommufd core free it, but

nothing serializes that against the error interrupt: tegra241_cmdqv_isr()

reads cmdqv->vintfs[idx] and dereferences the vintf. A concurrent error can

make the ISR read a slot mid-clear (a NULL deref) or use a vintf which is

about to be freed (a use-after-free).

deinit_vintf() also returns idx to the IDA before clearing the slot, so a

concurrent create that reuses idx can publish its new vintf into the slot,

only for this teardown to erase it again with the stale NULL store.

On the other end, tegra241_cmdqv_init_vintf() publishes a new vintf with a

plain store to the cmdqv->vintfs[] slot, and the ISR dereferences fields of

a

/// 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