CVE-2026-43253

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 completio…

Vendor / product: Linux — linux kernel

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

7.5

7.5 (CVSS v3.1)

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

Severity source: NVD CVSS v3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

Timeline (UTC)

Published: 2026-05-06 12:16

Modified: 2026-10-30 13:18

NVD status: Modified

Last synced 1 day ago

Verified against the source API 2026-10-30 13:38 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

linux / linux_kernel ≥4.9 <6.6.128, ≥6.7 <6.12.75, ≥6.13 <6.18.16, ≥6.19 <6.19.6

Weakness classification (CWE)

CWE-667 CWE-833

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Patch / mitigation: https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5

Patch / mitigation: https://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324

Patch / mitigation: https://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf

Patch / mitigation: https://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0

Patch / mitigation: https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58

References

https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/69d9339c02eddfc2a345be7220651068a3684383 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Data sources

NVD CVE API 2.0 — fetched 2026-10-30 13:38 UTC · record ↗

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CVE-2026-43253

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Weakness classification (CWE)

Mitigation & advisories

References

Data sources

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