Answer in brief
CVE-2026-43253 records a Unknown severity vulnerability in iommu/amd: move wait_on_sem() out of spinlock. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=4bf5beef578e46393f11eb69dda7d17a065e05ff <f2f65b28d802a667119147444ec2ae33eebf9a58 || >=4bf5beef578e46393f11eb69dda7d17a065e05ff <715c263119fd1b918a9fcbd8a36ea5b604a46324 || >=4bf5beef578e46393f11eb69dda7d17a065e05ff <e15768e68820142077bbca402d8e902f64ade1b0 || >=4bf5beef578e46393f11eb69dda7d17a065e05ff <496269d12072ecb219826485bdbec70c92a8eef5 || >=4bf5beef578e46393f11eb69dda7d17a065e05ff <d2a0cac10597068567d336e85fa3cbdbe8ca62bf | f2f65b28d802a667119147444ec2ae33eebf9a58, 715c263119fd1b918a9fcbd8a36ea5b604a46324, e15768e68820142077bbca402d8e902f64ade1b0, 496269d12072ecb219826485bdbec70c92a8eef5, d2a0cac10597068567d336e85fa3cbdbe8ca62bf |
| Linux/Linuxgeneric | 4.9 | Not reported |
Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-43253 records a Unknown severity vulnerability in iommu/amd: move wait_on_sem() out of spinlock. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=4bf5beef578e46393f11eb69dda7d17a065e05ff <f2f65b28d802a667119147444ec2ae33eebf9a58 || >=4bf5beef578e46393f11eb69dda7d17a065e05ff <715c263119fd1b918a9fcbd8a36ea5b604a46324 || >=4bf5beef578e46393f11eb69dda7d17a065e05ff <e15768e68820142077bbca402d8e902f64ade1b0 || >=4bf5beef578e46393f11eb69dda7d17a065e05ff <496269d12072ecb219826485bdbec70c92a8eef5 || >=4bf5beef578e46393f11eb69dda7d17a065e05ff <d2a0cac10597068567d336e85fa3cbdbe8ca62bf | f2f65b28d802a667119147444ec2ae33eebf9a58, 715c263119fd1b918a9fcbd8a36ea5b604a46324, e15768e68820142077bbca402d8e902f64ade1b0, 496269d12072ecb219826485bdbec70c92a8eef5, d2a0cac10597068567d336e85fa3cbdbe8ca62bf |
| Linux/Linuxgeneric | 4.9 | Not reported |
Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.