CVE-2026-90373 (GCVE-0-2026-90373)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-09-17 16:09
VLAI
Title
wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear mt7915_remove_interface() cleared the wcid mask bit with no lock held and before clearing the RCU wcid pointer. The mask is a non-atomic RMW shared with the allocators, which all run under dev->mt76.mutex; on DBDC the two wiphys share one mt76_dev, so this raced add_interface/sta_add on the other band and could leak or double-hand-out a wcid. Clearing the bit before the RCU pointer also let a concurrent allocation reuse the index and publish its wcid, which the subsequent NULL assignment then wiped. Move the clear into the existing mutex section, after the RCU pointer is cleared.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f3049b88b2b32326df97461813ae73e8bbc296fc , < 5dce25f1d609ba991a9c22c27be586c92f03ed77 (git)
Affected: f3049b88b2b32326df97461813ae73e8bbc296fc , < b4a41a47a67c788e6b0625fa517ec8872e99bb6c (git)
Affected: f3049b88b2b32326df97461813ae73e8bbc296fc , < a97b2b942d2f8f12fbd6a7caafc735d1ad115e6b (git)
Affected: f3049b88b2b32326df97461813ae73e8bbc296fc , < 6486e11a6e2f679597af2d5bb48c3b07a2b2a7ba (git)
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Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (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)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7915/main.c"
          ],
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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: mt7915: clear wcid mask under mutex after RCU pointer clear\n\nmt7915_remove_interface() cleared the wcid mask bit with no lock held and\nbefore clearing the RCU wcid pointer. The mask is a non-atomic RMW shared\nwith the allocators, which all run under dev-\u003emt76.mutex; on DBDC the two\nwiphys share one mt76_dev, so this raced add_interface/sta_add on the\nother band and could leak or double-hand-out a wcid. Clearing the bit\nbefore the RCU pointer also let a concurrent allocation reuse the index\nand publish its wcid, which the subsequent NULL assignment then wiped.\nMove the clear into the existing mutex section, after the RCU pointer is\ncleared."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:09:13.368Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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      ],
      "title": "wifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90373",
    "datePublished": "2026-09-17T16:09:13.368Z",
    "dateReserved": "2026-09-11T19:38:34.808Z",
    "dateUpdated": "2026-09-17T16:09:13.368Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-29",
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      "percentile": "0.09903"
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7915: clear wcid mask under mutex after RCU pointer clear\n\nmt7915_remove_interface() cleared the wcid mask bit with no lock held and\nbefore clearing the RCU wcid pointer. The mask is a non-atomic RMW shared\nwith the allocators, which all run under dev-\u003emt76.mutex; on DBDC the two\nwiphys share one mt76_dev, so this raced add_interface/sta_add on the\nother band and could leak or double-hand-out a wcid. Clearing the bit\nbefore the RCU pointer also let a concurrent allocation reuse the index\nand publish its wcid, which the subsequent NULL assignment then wiped.\nMove the clear into the existing mutex section, after the RCU pointer is\ncleared."
          }
        ],
        "id": "CVE-2026-90373",
        "lastModified": "2026-09-17T17:17:36.503",
        "metrics": {},
        "published": "2026-09-17T17:17:36.503",
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      "cve": "CVE-2026-90373",
      "id": "CVE-2026-90373",
      "initial_release_date": "2026-09-18T00:17:14Z",
      "product_status:known_not_affected": "347",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90373",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90373.json",
      "version": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.