Vulnerability-Lookup

GHSA-FCV3-4H5F-37C2

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31

Details

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

usb: dwc2: Fix use after free in debug code

We're not allowed to dereference "urb" after calling usb_hcd_giveback_urb() so save the urb->status ahead of time.

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-2026-63927"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:11Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc2: Fix use after free in debug code\n\nWe\u0027re not allowed to dereference \"urb\" after calling\nusb_hcd_giveback_urb() so save the urb-\u003estatus ahead of time.",
  "id": "GHSA-fcv3-4h5f-37c2",
  "modified": "2026-07-20T15:31:52Z",
  "published": "2026-07-19T18:31:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63927"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0584af4fe40fa5e254a05d69ce658746de641708"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63b0dafa676aad4d0c3f01a61ad8e2990907660c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d0b79d1d1118145e48a68192b6d733e39387053"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/84ea928ed584756e59c6ac09736f12d1db95ded0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9ea06a3fbf9f16e0d98c52cb3b99642be15ec281"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9fe1d84f7e2cf33634e8afb7f4b7f8de182dd913"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a15eeeceb94cbc04edef395e4d777ff554bdc27d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5fc183ed614aeba6779cc992325be560f9a4451"
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  "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-2026-63927 (GCVE-0-2026-63927)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-10-19 20:17

Title

usb: dwc2: Fix use after free in debug code

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: dwc2: Fix use after free in debug code We're not allowed to dereference "urb" after calling usb_hcd_giveback_urb() so save the urb->status ahead of time.

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-16 15:33 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6843 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/d5fc183ed614aeba6…
https://git.kernel.org/stable/c/63b0dafa676aad4d0…
https://git.kernel.org/stable/c/9fe1d84f7e2cf3363…
https://git.kernel.org/stable/c/0584af4fe40fa5e25…
https://git.kernel.org/stable/c/a15eeeceb94cbc04e…
https://git.kernel.org/stable/c/84ea928ed584756e5…
https://git.kernel.org/stable/c/6d0b79d1d1118145e…
https://git.kernel.org/stable/c/9ea06a3fbf9f16e0d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7359d482eb4d3967cc8be354405ae6be6eaf732c , < d5fc183ed614aeba6779cc992325be560f9a4451 (git) Affected: 7359d482eb4d3967cc8be354405ae6be6eaf732c , < 63b0dafa676aad4d0c3f01a61ad8e2990907660c (git) Affected: 7359d482eb4d3967cc8be354405ae6be6eaf732c , < 9fe1d84f7e2cf33634e8afb7f4b7f8de182dd913 (git) Affected: 7359d482eb4d3967cc8be354405ae6be6eaf732c , < 0584af4fe40fa5e254a05d69ce658746de641708 (git) Affected: 7359d482eb4d3967cc8be354405ae6be6eaf732c , < a15eeeceb94cbc04edef395e4d777ff554bdc27d (git) Affected: 7359d482eb4d3967cc8be354405ae6be6eaf732c , < 84ea928ed584756e59c6ac09736f12d1db95ded0 (git) Affected: 7359d482eb4d3967cc8be354405ae6be6eaf732c , < 6d0b79d1d1118145e48a68192b6d733e39387053 (git) Affected: 7359d482eb4d3967cc8be354405ae6be6eaf732c , < 9ea06a3fbf9f16e0d98c52cb3b99642be15ec281 (git)
Linux	Linux	Affected: 3.10 Unaffected: 0 , < 3.10 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-63927",
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              "value": "AV:L - The vulnerable dwc2 HCD urb_dequeue path is reached from local usbfs ioctls (USBDEVFS_SUBMITURB/DISCARDURB) on /dev/bus/usb device nodes, as well as from kernel unlink paths during USB I/O cancellation on dwc2-equipped embedded systems, kiosks, and mobile OTG hosts.\nAC:L - Once debug is enabled, an attacker can reliably drive the path by submitting and cancelling URBs (or forcing disconnect/error unlink storms) and can control the HCD_BH giveback race by running concurrent cancellation requests.\nPR:L - Triggering urb dequeue via usbfs requires only local user access to a USB device node (typically root or plugdev-group membership), which is low privilege and commonly available on dwc2 embedded platforms; no real root in the init namespace is required.\nUI:N - Exploitation requires only the attacker to submit and cancel USB transfers (or insert/disconnect a malicious USB device); no action by a separate victim user is needed.\nS:U - The UAF corrupts kernel heap memory within the kernel\u0027s own security authority and does not by itself cross a VM, container, or IOMMU boundary.\nC:H - Use-after-free of a kmalloc-backed struct urb after giveback can be groomed via heap spraying to obtain arbitrary kernel memory read primitives, not merely a bounded leak.\nI:H - UAF on the URB object in the general kmalloc slab enables attacker-controlled reuse of freed memory, supporting control-flow hijack and arbitrary kernel write/code execution.\nA:H - The post-giveback dereference can cause kernel oops/panic during URB teardown, and successful UAF exploitation can crash or hang the system."
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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.

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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.
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