Vulnerability-Lookup

GHSA-C2PF-RR3M-QVWF

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-09-03 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

usb: free iso schedules on failed submit

EHCI and FOTG210 isochronous submits build an ehci_iso_sched before linking the URB to the endpoint queue, and keep the staged schedule in urb->hcpriv until iso_stream_schedule() and the link helpers consume it. If the controller is no longer accessible, or usb_hcd_link_urb_to_ep() fails, submit jumps to done_not_linked before that handoff happens and leaks the staged schedule still attached to urb->hcpriv.

Free the staged schedule from done_not_linked when submit fails before the URB is linked and clear urb->hcpriv after the free.

The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1.1.

An x86_64 allyesconfig build showed no new warnings. As we do not have an EHCI host controller with a USB isochronous device to test with, no runtime testing was able to be performed.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64348"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:17Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: free iso schedules on failed submit\n\nEHCI and FOTG210 isochronous submits build an ehci_iso_sched before\nlinking the URB to the endpoint queue, and keep the staged schedule in\nurb-\u003ehcpriv until iso_stream_schedule() and the link helpers consume it.\nIf the controller is no longer accessible, or usb_hcd_link_urb_to_ep()\nfails, submit jumps to done_not_linked before that handoff happens and\nleaks the staged schedule still attached to urb-\u003ehcpriv.\n\nFree the staged schedule from done_not_linked when submit fails before\nthe URB is linked and clear urb-\u003ehcpriv after the free.\n\nThe bug was first flagged by an experimental analysis tool we are\ndeveloping for kernel memory-management bugs while analyzing\nv6.13-rc1. The tool is still under development and is not yet publicly\navailable. Manual inspection confirms that the bug is still\npresent in v7.1.1.\n\nAn x86_64 allyesconfig build showed no new warnings. As we do not have an\nEHCI host controller with a USB isochronous device to test with, no\nruntime testing was able to be performed.",
  "id": "GHSA-c2pf-rr3m-qvwf",
  "modified": "2026-09-03T18:31:17Z",
  "published": "2026-07-25T12:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64348"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4bb88aee6b868cbf73bf453f62497802f5fe4769"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6bc17a78a05671d303820224fb37ca339c1dc2cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8890699eea19027ef6e4f9cbcf27cba5e789793f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b0d00d077f9738d215af9b50c74dffab7a1de19f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9399d25fbb34a05bbe76eeedd730f62ff2670e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be5004395dfd0b6ec310db359f887fa396fd0dd2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-64348 (GCVE-0-2026-64348)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-08-17 04:53

Title

usb: free iso schedules on failed submit

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: free iso schedules on failed submit EHCI and FOTG210 isochronous submits build an ehci_iso_sched before linking the URB to the endpoint queue, and keep the staged schedule in urb->hcpriv until iso_stream_schedule() and the link helpers consume it. If the controller is no longer accessible, or usb_hcd_link_urb_to_ep() fails, submit jumps to done_not_linked before that handoff happens and leaks the staged schedule still attached to urb->hcpriv. Free the staged schedule from done_not_linked when submit fails before the URB is linked and clear urb->hcpriv after the free. The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1.1. An x86_64 allyesconfig build showed no new warnings. As we do not have an EHCI host controller with a USB isochronous device to test with, no runtime testing was able to be performed.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/b0d00d077f9738d21…
https://git.kernel.org/stable/c/be5004395dfd0b6ec…
https://git.kernel.org/stable/c/8890699eea19027ef…
https://git.kernel.org/stable/c/6bc17a78a05671d30…
https://git.kernel.org/stable/c/4bb88aee6b868cbf7…
https://git.kernel.org/stable/c/b9399d25fbb34a05b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8de98402652c01839ae321be6cb3054cf5735d83 , < b0d00d077f9738d215af9b50c74dffab7a1de19f (git) Affected: 8de98402652c01839ae321be6cb3054cf5735d83 , < be5004395dfd0b6ec310db359f887fa396fd0dd2 (git) Affected: 8de98402652c01839ae321be6cb3054cf5735d83 , < 8890699eea19027ef6e4f9cbcf27cba5e789793f (git) Affected: 8de98402652c01839ae321be6cb3054cf5735d83 , < 6bc17a78a05671d303820224fb37ca339c1dc2cb (git) Affected: 8de98402652c01839ae321be6cb3054cf5735d83 , < 4bb88aee6b868cbf73bf453f62497802f5fe4769 (git) Affected: 8de98402652c01839ae321be6cb3054cf5735d83 , < b9399d25fbb34a05bbe76eeedd730f62ff2670e9 (git)
Linux	Linux	Affected: 2.6.15 Unaffected: 0 , < 2.6.15 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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