CVE-2026-43253 Details
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.
A vulnerability in the Linux kernel's IOMMU AMD driver can lead to soft lockups, particularly in stressed environments. This issue arises because the function 'wait_on_sem()' busy-waits under a spinlock with interrupts disabled, causing unnecessary contention and prolonging the period with disabled interrupts. The problem is exacerbated when 'iommu.strict' is set to 1.
Users can upgrade to the patched version of the Linux kernel where this vulnerability has been addressed. The specific commit containing the fix is 'd2a0cac10597068567d336e85fa3cbdbe8ca62bf', which is available in the Linux kernel stable tree.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5 | kernel.org | Patch |
| https://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324 | kernel.org | Patch |
| https://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf | kernel.org | Patch |
| https://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0 | kernel.org | Patch |
| https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-667 | Improper Locking | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 4.9, < 6.6.128 >= 6.7, < 6.12.75 >= 6.13, < 6.18.16 >= 6.19, < 6.19.6 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 11, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | CVE Modified | kernel.org |
| May 6, 2026 | New CVE Received | kernel.org |