iommu/amd: move wait_on_sem() out of spinlock
Summary
| CVE | CVE-2026-43253 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-06 12:16:46 UTC |
| Updated | 2026-05-11 18:40:35 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.000440000 probability, percentile 0.135970000 (date 2026-05-11)
Problem Types: CWE-667
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | CNA | DECLARED | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 4bf5beef578e46393f11eb69dda7d17a065e05ff f2f65b28d802a667119147444ec2ae33eebf9a58 git | Not specified |
| CNA | Linux | Linux | affected 4bf5beef578e46393f11eb69dda7d17a065e05ff 715c263119fd1b918a9fcbd8a36ea5b604a46324 git | Not specified |
| CNA | Linux | Linux | affected 4bf5beef578e46393f11eb69dda7d17a065e05ff e15768e68820142077bbca402d8e902f64ade1b0 git | Not specified |
| CNA | Linux | Linux | affected 4bf5beef578e46393f11eb69dda7d17a065e05ff 496269d12072ecb219826485bdbec70c92a8eef5 git | Not specified |
| CNA | Linux | Linux | affected 4bf5beef578e46393f11eb69dda7d17a065e05ff d2a0cac10597068567d336e85fa3cbdbe8ca62bf git | Not specified |
| CNA | Linux | Linux | affected 4.9 | Not specified |
| CNA | Linux | Linux | unaffected 4.9 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.128 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.75 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.16 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.6 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.