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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.34% probability · 27th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-667
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5Patch
- https://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324Patch
- https://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bfPatch
- https://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0Patch
- https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.