CVE-2026-43253iommu/amd: move wait_on_sem() out of spinlock
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4bf5beef578e46393f11eb69dda7d17a065e05ff before f2f65b28d802a667119147444ec2ae33eebf9a58; from 4bf5beef578e46393f11eb69dda7d17a065e05ff before 715c263119fd1b918a9fcbd8a36ea5b604a46324; from 4bf5beef578e46393f11eb69dda7d17a065e05ff before e15768e68820142077bbca402d8e902f64ade1b0; from 4bf5beef578e46393f11eb69dda7d17a065e05ff before 496269d12072ecb219826485bdbec70c92a8eef5; from 4bf5beef578e46393f11eb69dda7d17a065e05ff before d2a0cac10597068567d336e85fa3cbdbe8ca62bf | CNA record |
linux linux_kernel linux:linux_kernel | from 4.9 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16; from 6.19 before 6.19.6 | NVD |
References
- https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58patch
- https://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324patch
- https://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0patch
- https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5patch
- https://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bfpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.