CVE-2026-43253High· 7.5▾ TwilightIn 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(…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.5%
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.
Linux >= 4bf5beef578e46393f11eb69dda7d17a065e05ff < f2f65b28d802a667119147444ec2ae33eebf9a58Linux >= 4bf5beef578e46393f11eb69dda7d17a065e05ff < 715c263119fd1b918a9fcbd8a36ea5b604a46324Linux >= 4bf5beef578e46393f11eb69dda7d17a065e05ff < e15768e68820142077bbca402d8e902f64ade1b0Linux >= 4bf5beef578e46393f11eb69dda7d17a065e05ff < 496269d12072ecb219826485bdbec70c92a8eef5Linux >= 4bf5beef578e46393f11eb69dda7d17a065e05ff < d2a0cac10597068567d336e85fa3cbdbe8ca62bfLinux 4.9Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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