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CVE-2026-98933 Linux CVE debrief

A Linux kernel vulnerability (CVE-2026-98933) involves reducing the post-resume hold time to 120ms for SS root hubs to mitigate an AMD platform issue. The issue arises when holding a USB3 hub PM runtime reference for 200ms at hub resume, triggering a problem on certain AMD platforms. Users running Android adb have reported crashes after prolonged polling and waking up of the USB subsystem. While vendors work on a solution, a 120ms hold time for USB3 root hubs has been deemed a valid change and optimization.

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-23
Original CVE updated
2026-10-30
Advisory published
2026-10-23
Advisory updated
2026-10-30

Who should care

Linux kernel maintainers, users, and administrators; teams responsible for Linux kernel configurations and updates. They should assess exposure, verify affected versions, and apply patches or workarounds to mitigate AMD platform issues. Additionally, they should monitor system behavior for crashes or issues related to USB subsystem and review compensating controls for exposed systems.

Why it matters

CVE-2026-98933 is a Linux kernel vulnerability that requires verification of affected versions and application of patches or workarounds to mitigate AMD platform issues.

  • Verify Linux kernel versions and configurations to assess exposure
  • Apply patches or workarounds to mitigate AMD platform issues
  • Monitor system behavior for crashes or issues related to USB subsystem
  • Review and update incident response plans for potential USB-related disruptions

Technical summary

The Linux kernel vulnerability (CVE-2026-98933) involves a 200ms post-resume hold time for USB3 hubs, which triggers an issue on certain AMD platforms. A 120ms hold time for USB3 root hubs has been proposed as a mitigation. This change is a valid optimization, as the current 200ms hold time is excessive for root hubs. The mitigation requires verification of affected versions and application of patches or workarounds to mitigate AMD platform issues. Linux kernel maintainers, users, and administrators should assess exposure, verify affected versions, and apply patches or workarounds.

Defensive priority

Assess exposure: Linux kernel maintainers and users; verify affected versions; apply patches or workarounds.

Recommended defensive actions

  • Assess exposure: review Linux kernel versions and configurations
  • Verify affected versions: check Linux kernel changelogs and version histories
  • Apply patches or workarounds: update Linux kernel to recommended versions
  • Monitor system behavior: watch for crashes or issues related to USB subsystem
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and source item provide details on the Linux kernel vulnerability and proposed mitigation. Multiple source references are available, including kernel.org links. The issue arises when holding a USB3 hub PM runtime reference for 200ms at hub resume, triggering a problem on certain AMD platforms. Users running Android adb have reported crashes after prolonged polling and waking up of the USB subsystem. A 120ms hold time for USB3 root hubs has been deemed a valid change and optimization. Defenders should verify affected to

Sources and references

Verified primary and authoritative sources

  • CVE-2026-98933 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-98933

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-98933 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-98933

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • usb: hub: use shorter 120ms post resume hold for SS root hubs

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/98xxx/CVE-2026-98933.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/ff21323b74a876c54b1ebe9e5f8ba5abc7e07fd3

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/73d4fbc496935ccaffba15ca5ec33660c2b587fb

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/86e0baedd55fca30081fcd858ab336dfc0f1cc09

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/e4df763ba3c4fdd1d9256f7a75a17ab7c5e31db6

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/2dc82d6a12050c2c678a328cd29837beb367df7d

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/e9545dd8bc62596b2a20966be41f39879ea7c8d0

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/d7c4a49b41583266e1456d40f37966029f61dab9

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.