CVE-2026-90430

Status: UPDATED  |  Advisory ID: CVE-2026-90430

Key Details

Affected Products, Subsystems & Sectors

What to Know

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

iommu/tegra241-cmdqv: Publish an LVCMDQ only after it is fully initialized

tegra241_vintf_init_lvcmdq() stores the freshly allocated vcmdq pointer to

the vintf->lvcmdqs[] array, before tegra241_vcmdq_alloc_smmu_cmdq() builds

the vcmdq->cmdq. The error ISR dereferences that cmdq, so a latched LVCMDQ

error (e.g. one inherited across a kexec) firing in this window would make

tegra241_vintf0_handle_error() pass the still-zeroed arm_smmu_cmdq down to

__arm_smmu_cmdq_skip_err(), dereferencing NULL queue register pointers.

Drop the store from tegra241_vintf_init_lvcmdq() and publish the vcmdq at

the end of the allocation instead, with an smp_store_release() that pairs

with an smp_load_acquire() in the ISR, which can see a fully built LVCMDQ

or NULL.

The user-owned LVCMDQ allocation moves accordingly, publishing the vcmdq

once tegra241_vcmdq_hw_init_user() succeeds, using a plain store since a

user VINTF's lvcmdqs[] has no lockless reader -- the error ISR only walks

the VINTF0 array. (NVD)

What to Do

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

References