CVE-2026-90015Public exploit

Data corruption via lost xHCI bounce buffers

Published Sep 16, 2026 · Updated Sep 16, 2026

Data corruption in the Linux kernel xHCI driver allows local users to retain stale bytes in completed large fragmented USB IN transfers. xhci_unmap_td_bounce_buffer() follows only td->bounce_seg, so earlier segment bounce buffers are neither copied into the URB nor DMA-unmapped. The condition requires a bulk transfer spanning at least three ring segments with boundary data misaligned to wMaxPacketSize; affected reads can silently consume stale data while each dropped bounce also leaks a DMA mapping.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data corruption in the Linux kernel xHCI driver allows local users to retain stale bytes in completed large fragmented USB IN transfers. xhci_unmap_td_bounce_buffer() follows only td->bounce_seg, so earlier segment bounce buffers are neither copied into the URB nor DMA-unmapped. The condition requires a bulk transfer spanning at least three ring segments with boundary data misaligned to wMaxPacketSize; affected reads can silently consume stale data while each dropped bounce also leaks a DMA mapping.

The record

CVE
CVE-2026-90015
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.8
  2. Affected versionversion=f9c589e142d04b8a19eb382162f804d17102b5ed <3c9a2b5a4f1183696f02ac280ced1d34afb409b1
  3. Affected versionversion=f9c589e142d04b8a19eb382162f804d17102b5ed <43239fc6dfb62c50ae1b9c0e82bac0f8cd2e285c
  4. Affected versionversion=f9c589e142d04b8a19eb382162f804d17102b5ed <7236bbd2cb7d9fc0eda896bbd34790341e2a4377
  5. Affected versionversion=f9c589e142d04b8a19eb382162f804d17102b5ed <a1629dfb011446d02905778f6df19f14c5f4f3b3
  6. Affected versionversion=f9c589e142d04b8a19eb382162f804d17102b5ed <c8124b28f12dbdd126118e63d0ebf8093a01fb81
  7. Affected versionversion=f9c589e142d04b8a19eb382162f804d17102b5ed <e04d5304a248e5d2a7f4faa87541644bdd320cfb
  8. Affected versionversion=f9c589e142d04b8a19eb382162f804d17102b5ed <efaab8938fb92979be6df359f7d1a43fb7e4717d
  9. Affected versionversion=f9c589e142d04b8a19eb382162f804d17102b5ed <ff44dfb03a293bf30e31f98772a1dd316a6071d1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.8; version=f9c589e142d04b8a19eb382162f804d17102b5ed <3c9a2b5a4f1183696f02ac280ced1d34afb409b1; version=f9c589e142d04b8a19eb382162f804d17102b5ed <43239fc6dfb62c50ae1b9c0e82bac0f8cd2e285c; version=f9c589e142d04b8a19eb382162f804d17102b5ed <7236bbd2cb7d9fc0eda896bbd34790341e2a4377; version=f9c589e142d04b8a19eb382162f804d17102b5ed <a1629dfb011446d02905778f6df19f14c5f4f3b3; version=f9c589e142d04b8a19eb382162f804d17102b5ed <c8124b28f12dbdd126118e63d0ebf8093a01fb81; version=f9c589e142d04b8a19eb382162f804d17102b5ed <e04d5304a248e5d2a7f4faa87541644bdd320cfb; version=f9c589e142d04b8a19eb382162f804d17102b5ed <efaab8938fb92979be6df359f7d1a43fb7e4717d; version=f9c589e142d04b8a19eb382162f804d17102b5ed <ff44dfb03a293bf30e31f98772a1dd316a6071d1

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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