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CVE-2026-43353 (GCVE-0-2026-43353)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-08-05 12:27
VLAI
Title
i3c: mipi-i3c-hci: Fix race in DMA ring dequeue
Summary
In the Linux kernel, the following vulnerability has been resolved: i3c: mipi-i3c-hci: Fix race in DMA ring dequeue The HCI DMA dequeue path (hci_dma_dequeue_xfer()) may be invoked for multiple transfers that timeout around the same time. However, the function is not serialized and can race with itself. When a timeout occurs, hci_dma_dequeue_xfer() stops the ring, processes incomplete transfers, and then restarts the ring. If another timeout triggers a parallel call into the same function, the two instances may interfere with each other - stopping or restarting the ring at unexpected times. Add a mutex so that hci_dma_dequeue_xfer() is serialized with respect to itself.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9ad9a52cce2828d932ae9495181e3d6414f72c07 , < b684b420a5bb0ea1b0e13abfdb8ce41c5266e62e (git)
Affected: 9ad9a52cce2828d932ae9495181e3d6414f72c07 , < 4faa1e9c67a2229f6749190aedaf88ce0391efd2 (git)
Affected: 9ad9a52cce2828d932ae9495181e3d6414f72c07 , < 1dca8aee80eea76d2aae21265de5dd64f6ba0f09 (git)
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Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni3c: mipi-i3c-hci: Fix race in DMA ring dequeue\n\nThe HCI DMA dequeue path (hci_dma_dequeue_xfer()) may be invoked for\nmultiple transfers that timeout around the same time.  However, the\nfunction is not serialized and can race with itself.\n\nWhen a timeout occurs, hci_dma_dequeue_xfer() stops the ring, processes\nincomplete transfers, and then restarts the ring.  If another timeout\ntriggers a parallel call into the same function, the two instances may\ninterfere with each other - stopping or restarting the ring at unexpected\ntimes.\n\nAdd a mutex so that hci_dma_dequeue_xfer() is serialized with respect to\nitself."
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              "value": "AV:L - The vulnerable DMA dequeue path is reached through local kernel I3C/I2C transfer APIs, including userspace-triggerable device/client paths on systems exposing I3C-backed devices. There is no evidence of direct internet/network packet reachability for this HCI master driver.\nAC:L - The I3C core explicitly permits parallel normal transfers, and the bug is a missing serialization primitive when multiple transfers time out together. An attacker who can trigger concurrent transfers can create the race rather than relying on an uncontrollable rare condition.\nPR:L - Reaching the path requires local ability to cause I3C/I2C client transfers, such as access to exposed device interfaces or subsystem clients, but no kernel capability check is present in the vulnerable HCI dequeue logic itself. This is best treated as low local privilege rather than real administrator/root-only privilege.\nUI:N - Once the attacker can trigger the relevant transfers, no separate victim action is required. The timeout/dequeue handling runs in the kernel as part of transfer completion/error handling.\nS:U - The vulnerability corrupts or destabilizes kernel-controlled I3C HCI/DMA state within the same kernel security authority. It does not constitute a VM escape or an IOMMU/DMA isolation boundary bypass by itself.\nC:H - The race can restart or manipulate a DMA ring while another dequeue path is still aborting, replacing descriptors, and unmapping DMA buffers, leaving hardware able to access stale or unintended kernel memory. Under the required overestimate rule, this DMA memory corruption is treated as capable of high confidentiality impact.\nI:H - The same stale descriptor/unmap race can allow device DMA or ring state corruption to write into unintended or freed kernel memory. That is a memory corruption primitive, so high integrity impact is defensible.\nA:H - The vulnerable path can leave the DMA ring and host controller in an inconsistent state, trigger WARN/oops-like failure paths, or cause DMA/ring corruption. A kernel crash, hang, or persistent controller failure gives high availability impact."
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    "dateReserved": "2026-05-01T14:12:56.005Z",
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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.


Detection rules are retrieved from Rulezet.