CVE-2026-43253

In the Linux kernel, the following vulnerability has been resolved: iommu/amd: move wait_on_sem() out of spinlock With iommu.strict=1, the existing completion wait path can cause soft lockups under stressed environment, as wait_on_sem() busy-waits under the spinlock with interrupts disabled. Move the completion wait in iommu_completion_wait() out of the spinlock. wait_on_sem() only polls the hardware-updated cmd_sem and does not require iommu->lock, so holding the lock during the busy wait unnecessarily increases contention and extends the time with interrupts disabled.

The following products are affected by CVE-2026-43253 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-43253.

URL	Resource
https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5
https://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324
https://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf
https://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0
https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58
https://lore.kernel.org/linux-cve-announce/2026050604-CVE-2026-43253-838c@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-43253
https://www.cve.org/CVERecord?id=CVE-2026-43253