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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-43253

iommu/amd: move wait_on_sem() out of spinlock

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 4bf5beef578e46393f11eb69dda7d17a065e05ff to < 69d9339c02eddfc2a345be7220651068a3684383affected
  • 4bf5beef578e46393f11eb69dda7d17a065e05ff to < f2f65b28d802a667119147444ec2ae33eebf9a58affected
  • 4bf5beef578e46393f11eb69dda7d17a065e05ff to < 715c263119fd1b918a9fcbd8a36ea5b604a46324affected
  • 4bf5beef578e46393f11eb69dda7d17a065e05ff to < e15768e68820142077bbca402d8e902f64ade1b0affected
  • 4bf5beef578e46393f11eb69dda7d17a065e05ff to < 496269d12072ecb219826485bdbec70c92a8eef5affected
  • 4bf5beef578e46393f11eb69dda7d17a065e05ff to < d2a0cac10597068567d336e85fa3cbdbe8ca62bfaffected

Linux Linux

Default version status: affected

  • 4.9affected
  • 0 to < 4.9unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.128 to ≤ 6.6.*unaffected
  • 6.12.75 to ≤ 6.12.*unaffected
  • 6.18.16 to ≤ 6.18.*unaffected
  • 6.19.6 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References