Vulnerability-Lookup

GHSA-4GV8-VFVF-62F2

Vulnerability from github – Published: 2026-07-19 15:30 – Updated: 2026-07-20 15:31

Details

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

net: mctp: usb: fix race between urb completion and rx_retry cancellation

It's possible that sequencing between setting ->stopped and cancelling the rx_retry work (in ndo_stop) could leave us with an urb queued:

T1: ndo_stop                  T2: rx_retry_work
------------                  ----------------
                              LD: ->stopped => false
ST: ->stopped <= true
usb_kill_urb()
                              mctp_usb_rx_queue()
                                usb_submit_urb()
cancel_delayed_work_sync()

That urb completion can then re-schedule rx_retry_work.

Strenghen the sequencing between the stop (preventing another requeue) and the cancel by updating both atomically under a new rx lock. After setting ->rx_stopped, and cancelling pending work, we know that the requeue cannot occur, so all that's left is killing any pending urb.

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-2026-63874"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T15:16:54Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mctp: usb: fix race between urb completion and rx_retry cancellation\n\nIt\u0027s possible that sequencing between setting -\u003estopped and cancelling\nthe rx_retry work (in ndo_stop) could leave us with an urb queued:\n\n    T1: ndo_stop                  T2: rx_retry_work\n    ------------                  ----------------\n                                  LD: -\u003estopped =\u003e false\n    ST: -\u003estopped \u003c= true\n    usb_kill_urb()\n                                  mctp_usb_rx_queue()\n                                    usb_submit_urb()\n    cancel_delayed_work_sync()\n\nThat urb completion can then re-schedule rx_retry_work.\n\nStrenghen the sequencing between the stop (preventing another requeue)\nand the cancel by updating both atomically under a new rx lock. After\nsetting -\u003erx_stopped, and cancelling pending work, we know that the\nrequeue cannot occur, so all that\u0027s left is killing any pending urb.",
  "id": "GHSA-4gv8-vfvf-62f2",
  "modified": "2026-07-20T15:31:49Z",
  "published": "2026-07-19T15:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63874"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54665dce982689e2fd99b32e9a0dcc204fda8a51"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c46f3ee1837f6881cb99a52ffecb2760f11dc73"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d90feaa3f74bea8dafb6494631a194c70e547d94"
    }
  ],
  "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-2026-63874 (GCVE-0-2026-63874)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:18 – Updated: 2026-07-20 13:41

Title

net: mctp: usb: fix race between urb completion and rx_retry cancellation

Summary

In the Linux kernel, the following vulnerability has been resolved: net: mctp: usb: fix race between urb completion and rx_retry cancellation It's possible that sequencing between setting ->stopped and cancelling the rx_retry work (in ndo_stop) could leave us with an urb queued: T1: ndo_stop T2: rx_retry_work ------------ ---------------- LD: ->stopped => false ST: ->stopped <= true usb_kill_urb() mctp_usb_rx_queue() usb_submit_urb() cancel_delayed_work_sync() That urb completion can then re-schedule rx_retry_work. Strenghen the sequencing between the stop (preventing another requeue) and the cancel by updating both atomically under a new rx lock. After setting ->rx_stopped, and cancelling pending work, we know that the requeue cannot occur, so all that's left is killing any pending urb.

Severity

7.8 (High)


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

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/9c46f3ee1837f6881…
https://git.kernel.org/stable/c/d90feaa3f74bea8da…
https://git.kernel.org/stable/c/54665dce982689e2f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0791c0327a6e4e7691d6fc5ad334c215de04dcc9 , < 9c46f3ee1837f6881cb99a52ffecb2760f11dc73 (git) Affected: 0791c0327a6e4e7691d6fc5ad334c215de04dcc9 , < d90feaa3f74bea8dafb6494631a194c70e547d94 (git) Affected: 0791c0327a6e4e7691d6fc5ad334c215de04dcc9 , < 54665dce982689e2fd99b32e9a0dcc204fda8a51 (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/mctp/mctp-usb.c"
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          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "d90feaa3f74bea8dafb6494631a194c70e547d94",
              "status": "affected",
              "version": "0791c0327a6e4e7691d6fc5ad334c215de04dcc9",
              "versionType": "git"
            },
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              "lessThan": "54665dce982689e2fd99b32e9a0dcc204fda8a51",
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              "versionType": "git"
            }
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
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            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mctp: usb: fix race between urb completion and rx_retry cancellation\n\nIt\u0027s possible that sequencing between setting -\u003estopped and cancelling\nthe rx_retry work (in ndo_stop) could leave us with an urb queued:\n\n    T1: ndo_stop                  T2: rx_retry_work\n    ------------                  ----------------\n                                  LD: -\u003estopped =\u003e false\n    ST: -\u003estopped \u003c= true\n    usb_kill_urb()\n                                  mctp_usb_rx_queue()\n                                    usb_submit_urb()\n    cancel_delayed_work_sync()\n\nThat urb completion can then re-schedule rx_retry_work.\n\nStrenghen the sequencing between the stop (preventing another requeue)\nand the cancel by updating both atomically under a new rx lock. After\nsetting -\u003erx_stopped, and cancelling pending work, we know that the\nrequeue cannot occur, so all that\u0027s left is killing any pending urb."
        }
      ],
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          }
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        "dateUpdated": "2026-07-20T13:41:05.329Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
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        {
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      ],
      "title": "net: mctp: usb: fix race between urb completion and rx_retry cancellation",
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        "engine": "bippy-1.2.0"
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    "datePublished": "2026-07-19T14:18:41.907Z",
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    "state": "PUBLISHED"
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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.

Action not permitted

GHSA-4GV8-VFVF-62F2

CVE-2026-63874 (GCVE-0-2026-63874)

Tags

Sightings

Nomenclature