high7.5
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 …
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | from 4.9 before 6.6.128 from 6.7 before 6.12.75 from 6.13 before 6.18.16 from 6.19 before 6.19.6 |
Weakness classification
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5
- https://git.kernel.org/stable/c/69d9339c02eddfc2a345be7220651068a3684383
- 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