CVE-2026-43220 (GCVE-0-2026-43220)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-05-17 15:21
VLAI
Title
iommu/amd: serialize sequence allocation under concurrent TLB invalidations
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/amd: serialize sequence allocation under concurrent TLB invalidations With concurrent TLB invalidations, completion wait randomly gets timed out because cmd_sem_val was incremented outside the IOMMU spinlock, allowing CMD_COMPL_WAIT commands to be queued out of sequence and breaking the ordering assumption in wait_on_sem(). Move the cmd_sem_val increment under iommu->lock so completion sequence allocation is serialized with command queuing. And remove the unnecessary return.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f2f65b28d802a667119147444ec2ae33eebf9a58 , < d51bf43193b1e95dc4e34e540dc76e19def2ae5a (git)
Affected: 715c263119fd1b918a9fcbd8a36ea5b604a46324 , < fca7aa0264ae99e5ff287d0ced5af0b82b121c4f (git)
Affected: e15768e68820142077bbca402d8e902f64ade1b0 , < 5000ce7fcb31067566a1a1a2e5b5bbff93625242 (git)
Affected: 496269d12072ecb219826485bdbec70c92a8eef5 , < 48caa7542a795c9679ec1bd1bc2592e05a7369a4 (git)
Affected: d2a0cac10597068567d336e85fa3cbdbe8ca62bf , < 9e249c48412828e807afddc21527eb734dc9bd3d (git)
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Linux Linux Affected: 6.6.128 , < 6.6.140 (semver)
Affected: 6.12.75 , < 6.12.88 (semver)
guessed Create a notification for this product.
Show details on NVD website
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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