CVE-2026-43253
Published: May 6, 2026
Modified: May 11, 2026
CVSS v3.1
7.5
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.
| Vendor | Product | Versions |
|---|---|---|
Linux | Linux | affected 4bf5beef578e46393f11eb69dda7d17a065e05ff - < f2f65b28d802a667119147444ec2ae33eebf9a58affected 4bf5beef578e46393f11eb69dda7d17a065e05ff - < 715c263119fd1b918a9fcbd8a36ea5b604a46324affected 4bf5beef578e46393f11eb69dda7d17a065e05ff - < e15768e68820142077bbca402d8e902f64ade1b0affected 4bf5beef578e46393f11eb69dda7d17a065e05ff - < 496269d12072ecb219826485bdbec70c92a8eef5affected 4bf5beef578e46393f11eb69dda7d17a065e05ff - < d2a0cac10597068567d336e85fa3cbdbe8ca62bf |
Linux | Linux | affected 4.9unaffected 0 - < 4.9unaffected 6.6.128 - <= 6.6.*unaffected 6.12.75 - <= 6.12.*unaffected 6.18.16 - <= 6.18.*+2 more versions |
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
References
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