Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.9, < 6.6.128 |
Related Weaknesses (CWE)
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
FAQ
What is CVE-2026-43253?
CVE-2026-43253 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-43253?
CVE-2026-43253 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-43253?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.