Vulnerability-Lookup

FKIE_CVE-2026-93091

Vulnerability from fkie_nvd - Published: 2026-09-17 17:18 - Updated: 2026-09-17 17:18

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Quiesce notifications before teardown scmi_notification_exit() clears and releases the notification instance, but transport callbacks can still deliver incoming notifications until the TX/RX channels are freed. During remove, an RX interrupt in that window can enter scmi_notify() while notification state is being torn down and then dereference freed memory. The same ordering exists on the probe error path after notification initialization. The notification late-init worker has a separate lifetime issue: protocol event registration queues ni->init_work on the system workqueue, so destroying ni->notify_wq does not drain that work. If the devres group is released while init_work is still pending or running, the late-init worker can dereference the freed notification instance. Quiesce the notification core before TX/RX channels are torn down, then clean up the channels before releasing the notification core resources. Use disable_work_sync() so future late-init queueing is rejected and any already queued or running late-init work has completed before channel teardown starts.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2aac23bc0a79af41104d99823bb250fae92ba144
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5e30d3d16d1a9e599be4dcea872874e65e2c277b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6778bcabd2e0c32f73476f0bc6369013692540be
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8e49055d0d495c9c07575ad8e111d9eaf0efb13f

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/arm_scmi/driver.c",
            "drivers/firmware/arm_scmi/notify.c",
            "drivers/firmware/arm_scmi/notify.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6778bcabd2e0c32f73476f0bc6369013692540be",
              "status": "affected",
              "version": "1e7cbfaa66d39e78bd24df0c78b55df68176b59e",
              "versionType": "git"
            },
            {
              "lessThan": "2aac23bc0a79af41104d99823bb250fae92ba144",
              "status": "affected",
              "version": "1e7cbfaa66d39e78bd24df0c78b55df68176b59e",
              "versionType": "git"
            },
            {
              "lessThan": "5e30d3d16d1a9e599be4dcea872874e65e2c277b",
              "status": "affected",
              "version": "1e7cbfaa66d39e78bd24df0c78b55df68176b59e",
              "versionType": "git"
            },
            {
              "lessThan": "8e49055d0d495c9c07575ad8e111d9eaf0efb13f",
              "status": "affected",
              "version": "1e7cbfaa66d39e78bd24df0c78b55df68176b59e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/arm_scmi/driver.c",
            "drivers/firmware/arm_scmi/notify.c",
            "drivers/firmware/arm_scmi/notify.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Quiesce notifications before teardown\n\nscmi_notification_exit() clears and releases the notification instance,\nbut transport callbacks can still deliver incoming notifications until\nthe TX/RX channels are freed. During remove, an RX interrupt in that\nwindow can enter scmi_notify() while notification state is being torn\ndown and then dereference freed memory. The same ordering exists on the\nprobe error path after notification initialization.\n\nThe notification late-init worker has a separate lifetime issue: protocol\nevent registration queues ni-\u003einit_work on the system workqueue, so\ndestroying ni-\u003enotify_wq does not drain that work. If the devres group is\nreleased while init_work is still pending or running, the late-init worker\ncan dereference the freed notification instance.\n\nQuiesce the notification core before TX/RX channels are torn down, then\nclean up the channels before releasing the notification core resources.\nUse disable_work_sync() so future late-init queueing is rejected and any\nalready queued or running late-init work has completed before channel\nteardown starts."
    }
  ],
  "id": "CVE-2026-93091",
  "lastModified": "2026-09-17T17:18:03.063",
  "metrics": {},
  "published": "2026-09-17T17:18:03.063",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2aac23bc0a79af41104d99823bb250fae92ba144"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5e30d3d16d1a9e599be4dcea872874e65e2c277b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6778bcabd2e0c32f73476f0bc6369013692540be"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8e49055d0d495c9c07575ad8e111d9eaf0efb13f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-93091 (GCVE-0-2026-93091)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:11 – Updated: 2026-09-17 16:11

Title

firmware: arm_scmi: Quiesce notifications before teardown

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/6778bcabd2e0c32f7…
https://git.kernel.org/stable/c/2aac23bc0a79af411…
https://git.kernel.org/stable/c/5e30d3d16d1a9e599…
https://git.kernel.org/stable/c/8e49055d0d495c9c0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1e7cbfaa66d39e78bd24df0c78b55df68176b59e , < 6778bcabd2e0c32f73476f0bc6369013692540be (git) Affected: 1e7cbfaa66d39e78bd24df0c78b55df68176b59e , < 2aac23bc0a79af41104d99823bb250fae92ba144 (git) Affected: 1e7cbfaa66d39e78bd24df0c78b55df68176b59e , < 5e30d3d16d1a9e599be4dcea872874e65e2c277b (git) Affected: 1e7cbfaa66d39e78bd24df0c78b55df68176b59e , < 8e49055d0d495c9c07575ad8e111d9eaf0efb13f (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/arm_scmi/driver.c",
            "drivers/firmware/arm_scmi/notify.c",
            "drivers/firmware/arm_scmi/notify.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6778bcabd2e0c32f73476f0bc6369013692540be",
              "status": "affected",
              "version": "1e7cbfaa66d39e78bd24df0c78b55df68176b59e",
              "versionType": "git"
            },
            {
              "lessThan": "2aac23bc0a79af41104d99823bb250fae92ba144",
              "status": "affected",
              "version": "1e7cbfaa66d39e78bd24df0c78b55df68176b59e",
              "versionType": "git"
            },
            {
              "lessThan": "5e30d3d16d1a9e599be4dcea872874e65e2c277b",
              "status": "affected",
              "version": "1e7cbfaa66d39e78bd24df0c78b55df68176b59e",
              "versionType": "git"
            },
            {
              "lessThan": "8e49055d0d495c9c07575ad8e111d9eaf0efb13f",
              "status": "affected",
              "version": "1e7cbfaa66d39e78bd24df0c78b55df68176b59e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/arm_scmi/driver.c",
            "drivers/firmware/arm_scmi/notify.c",
            "drivers/firmware/arm_scmi/notify.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Quiesce notifications before teardown\n\nscmi_notification_exit() clears and releases the notification instance,\nbut transport callbacks can still deliver incoming notifications until\nthe TX/RX channels are freed. During remove, an RX interrupt in that\nwindow can enter scmi_notify() while notification state is being torn\ndown and then dereference freed memory. The same ordering exists on the\nprobe error path after notification initialization.\n\nThe notification late-init worker has a separate lifetime issue: protocol\nevent registration queues ni-\u003einit_work on the system workqueue, so\ndestroying ni-\u003enotify_wq does not drain that work. If the devres group is\nreleased while init_work is still pending or running, the late-init worker\ncan dereference the freed notification instance.\n\nQuiesce the notification core before TX/RX channels are torn down, then\nclean up the channels before releasing the notification core resources.\nUse disable_work_sync() so future late-init queueing is rejected and any\nalready queued or running late-init work has completed before channel\nteardown starts."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:11:07.055Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6778bcabd2e0c32f73476f0bc6369013692540be"
        },
        {
          "url": "https://git.kernel.org/stable/c/2aac23bc0a79af41104d99823bb250fae92ba144"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e30d3d16d1a9e599be4dcea872874e65e2c277b"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e49055d0d495c9c07575ad8e111d9eaf0efb13f"
        }
      ],
      "title": "firmware: arm_scmi: Quiesce notifications before teardown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93091",
    "datePublished": "2026-09-17T16:11:07.055Z",
    "dateReserved": "2026-09-17T16:02:15.084Z",
    "dateUpdated": "2026-09-17T16:11:07.055Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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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