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GHSA-C2CQ-R8GQ-MFVQ

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32

Details

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

wifi: mt76: mt7996: free vif links after clearing wcid entries on full reset

mt7996_mac_reset_vif_iter() queues non-default vif links for kfree_rcu while dev->wcid[] still holds pointers to the wcid embedded in each freed link; mt76_reset_device() then dereferences those entries and runs mt76_wcid_cleanup() on them. If a grace period elapses in between, the cleanup operates on freed memory.

Run mt76_reset_device() first, so the wcid entries are cleaned up and cleared while the links are still valid.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-90356"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:34Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7996: free vif links after clearing wcid entries on full reset\n\nmt7996_mac_reset_vif_iter() queues non-default vif links for kfree_rcu\nwhile dev-\u003ewcid[] still holds pointers to the wcid embedded in each\nfreed link; mt76_reset_device() then dereferences those entries and\nruns mt76_wcid_cleanup() on them. If a grace period elapses in between,\nthe cleanup operates on freed memory.\n\nRun mt76_reset_device() first, so the wcid entries are cleaned up and\ncleared while the links are still valid.",
  "id": "GHSA-c2cq-r8gq-mfvq",
  "modified": "2026-09-17T18:32:02Z",
  "published": "2026-09-17T18:32:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90356"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b10eb3636d0c4cb6b763e045ec1294dbd70f5ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e4208e9f6a876c2b7d28fdb6b86dff3b05db2f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8826d7a5e2dd727aa96456ccd58b33d2b080e935"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-90356 (GCVE-0-2026-90356)

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

Title

wifi: mt76: mt7996: free vif links after clearing wcid entries on full reset

Summary

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7996: free vif links after clearing wcid entries on full reset mt7996_mac_reset_vif_iter() queues non-default vif links for kfree_rcu while dev->wcid[] still holds pointers to the wcid embedded in each freed link; mt76_reset_device() then dereferences those entries and runs mt76_wcid_cleanup() on them. If a grace period elapses in between, the cleanup operates on freed memory. Run mt76_reset_device() first, so the wcid entries are cleaned up and cleared while the links are still valid.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/2b10eb3636d0c4cb6…
https://git.kernel.org/stable/c/8826d7a5e2dd727aa…
https://git.kernel.org/stable/c/7e4208e9f6a876c2b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ace5d3b6b49e8391beb4d7244348ba7da5298878 , < 2b10eb3636d0c4cb6b763e045ec1294dbd70f5ad (git) Affected: ace5d3b6b49e8391beb4d7244348ba7da5298878 , < 8826d7a5e2dd727aa96456ccd58b33d2b080e935 (git) Affected: ace5d3b6b49e8391beb4d7244348ba7da5298878 , < 7e4208e9f6a876c2b7d28fdb6b86dff3b05db2f7 (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7996/mac.c"
          ],
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          "versions": [
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "ace5d3b6b49e8391beb4d7244348ba7da5298878",
              "versionType": "git"
            },
            {
              "lessThan": "7e4208e9f6a876c2b7d28fdb6b86dff3b05db2f7",
              "status": "affected",
              "version": "ace5d3b6b49e8391beb4d7244348ba7da5298878",
              "versionType": "git"
            }
          ]
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        {
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "6.18"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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            },
            {
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              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
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            }
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        }
      ],
      "cpeApplicability": [
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                },
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                },
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                  "versionEndExcluding": "7.3-rc1",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7996: free vif links after clearing wcid entries on full reset\n\nmt7996_mac_reset_vif_iter() queues non-default vif links for kfree_rcu\nwhile dev-\u003ewcid[] still holds pointers to the wcid embedded in each\nfreed link; mt76_reset_device() then dereferences those entries and\nruns mt76_wcid_cleanup() on them. If a grace period elapses in between,\nthe cleanup operates on freed memory.\n\nRun mt76_reset_device() first, so the wcid entries are cleaned up and\ncleared while the links are still valid."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:09:02.189Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/7e4208e9f6a876c2b7d28fdb6b86dff3b05db2f7"
        }
      ],
      "title": "wifi: mt76: mt7996: free vif links after clearing wcid entries on full reset",
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    "dateReserved": "2026-09-11T19:38:34.806Z",
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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.

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.
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GHSA-C2CQ-R8GQ-MFVQ

CVE-2026-90356 (GCVE-0-2026-90356)

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