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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.

PUBLISHED Reserved 2026-05-01 | Published 2026-05-06 | Updated 2026-05-08 | Assigner Linux




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Product status

Default status
unaffected

4bf5beef578e46393f11eb69dda7d17a065e05ff (git) before f2f65b28d802a667119147444ec2ae33eebf9a58
affected

4bf5beef578e46393f11eb69dda7d17a065e05ff (git) before 715c263119fd1b918a9fcbd8a36ea5b604a46324
affected

4bf5beef578e46393f11eb69dda7d17a065e05ff (git) before e15768e68820142077bbca402d8e902f64ade1b0
affected

4bf5beef578e46393f11eb69dda7d17a065e05ff (git) before 496269d12072ecb219826485bdbec70c92a8eef5
affected

4bf5beef578e46393f11eb69dda7d17a065e05ff (git) before d2a0cac10597068567d336e85fa3cbdbe8ca62bf
affected

Default status
affected

4.9
affected

Any version before 4.9
unaffected

6.6.128 (semver)
unaffected

6.12.75 (semver)
unaffected

6.18.16 (semver)
unaffected

6.19.6 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/f2f65b28d802a667119147444ec2ae33eebf9a58

git.kernel.org/...c/715c263119fd1b918a9fcbd8a36ea5b604a46324

git.kernel.org/...c/e15768e68820142077bbca402d8e902f64ade1b0

git.kernel.org/...c/496269d12072ecb219826485bdbec70c92a8eef5

git.kernel.org/...c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf

cve.org (CVE-2026-43253)

nvd.nist.gov (CVE-2026-43253)

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