Vulnerability-Lookup

GHSA-R94P-VPQ4-R3GX

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-18 18:31

Details

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

wifi: mt76: mt7915: fix ext PHY use-after-free on register error path

After mt7915_register_ext_phy() succeeded, a failure of the main PHY mt7915_init_debugfs() or mt7915_coredump_register() unwound through free_phy2, which called ieee80211_free_hw() on the ext PHY hw while it was still registered with mac80211, since mt76_unregister_device() only unregisters the main hw. Unregister the ext PHY (thermal + phy + hw) first and skip the redundant free.

Severity

7.0 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-90353"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:34Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7915: fix ext PHY use-after-free on register error path\n\nAfter mt7915_register_ext_phy() succeeded, a failure of the main PHY\nmt7915_init_debugfs() or mt7915_coredump_register() unwound through\nfree_phy2, which called ieee80211_free_hw() on the ext PHY hw while it\nwas still registered with mac80211, since mt76_unregister_device() only\nunregisters the main hw. Unregister the ext PHY (thermal + phy + hw)\nfirst and skip the redundant free.",
  "id": "GHSA-r94p-vpq4-r3gx",
  "modified": "2026-09-18T18:31:30Z",
  "published": "2026-09-17T18:32:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90353"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15b960014f24dce5388d4a2e7274e6490cb3c421"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/34058ad122f7524e33df8e38caba4b1d803b025a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/648f5f03ff50d4bd719106ace0cdf1d8be02cbdd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7fd3bae8e11a7c00df6a5021d9ef248ae9f9bf5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa55bec92ba7747dd08feff409f8074c5e052e71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad706fcf6255494613b94418e7243d98065dbeaf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-90353 (GCVE-0-2026-90353)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-09-18 17:54

Title

wifi: mt76: mt7915: fix ext PHY use-after-free on register error path

Summary

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7915: fix ext PHY use-after-free on register error path After mt7915_register_ext_phy() succeeded, a failure of the main PHY mt7915_init_debugfs() or mt7915_coredump_register() unwound through free_phy2, which called ieee80211_free_hw() on the ext PHY hw while it was still registered with mac80211, since mt76_unregister_device() only unregisters the main hw. Unregister the ext PHY (thermal + phy + hw) first and skip the redundant free.

Severity

7 (High)


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

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/aa55bec92ba7747dd…
https://git.kernel.org/stable/c/ad706fcf625549461…
https://git.kernel.org/stable/c/34058ad122f7524e3…
https://git.kernel.org/stable/c/a7fd3bae8e11a7c00…
https://git.kernel.org/stable/c/648f5f03ff50d4bd7…
https://git.kernel.org/stable/c/15b960014f24dce53…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 7b8e1ae886e45aed9274048f2836a70b75ecfa40 , < aa55bec92ba7747dd08feff409f8074c5e052e71 (git) Affected: 7b8e1ae886e45aed9274048f2836a70b75ecfa40 , < ad706fcf6255494613b94418e7243d98065dbeaf (git) Affected: 7b8e1ae886e45aed9274048f2836a70b75ecfa40 , < 34058ad122f7524e33df8e38caba4b1d803b025a (git) Affected: 7b8e1ae886e45aed9274048f2836a70b75ecfa40 , < a7fd3bae8e11a7c00df6a5021d9ef248ae9f9bf5 (git) Affected: 7b8e1ae886e45aed9274048f2836a70b75ecfa40 , < 648f5f03ff50d4bd719106ace0cdf1d8be02cbdd (git) Affected: 7b8e1ae886e45aed9274048f2836a70b75ecfa40 , < 15b960014f24dce5388d4a2e7274e6490cb3c421 (git)
Linux	Linux	Affected: 5.19 Unaffected: 0 , < 5.19 (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (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": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7915/init.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "aa55bec92ba7747dd08feff409f8074c5e052e71",
              "status": "affected",
              "version": "7b8e1ae886e45aed9274048f2836a70b75ecfa40",
              "versionType": "git"
            },
            {
              "lessThan": "ad706fcf6255494613b94418e7243d98065dbeaf",
              "status": "affected",
              "version": "7b8e1ae886e45aed9274048f2836a70b75ecfa40",
              "versionType": "git"
            },
            {
              "lessThan": "34058ad122f7524e33df8e38caba4b1d803b025a",
              "status": "affected",
              "version": "7b8e1ae886e45aed9274048f2836a70b75ecfa40",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "7b8e1ae886e45aed9274048f2836a70b75ecfa40",
              "versionType": "git"
            },
            {
              "lessThan": "648f5f03ff50d4bd719106ace0cdf1d8be02cbdd",
              "status": "affected",
              "version": "7b8e1ae886e45aed9274048f2836a70b75ecfa40",
              "versionType": "git"
            },
            {
              "lessThan": "15b960014f24dce5388d4a2e7274e6490cb3c421",
              "status": "affected",
              "version": "7b8e1ae886e45aed9274048f2836a70b75ecfa40",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7915/init.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "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": "6.1.188",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7915: fix ext PHY use-after-free on register error path\n\nAfter mt7915_register_ext_phy() succeeded, a failure of the main PHY\nmt7915_init_debugfs() or mt7915_coredump_register() unwound through\nfree_phy2, which called ieee80211_free_hw() on the ext PHY hw while it\nwas still registered with mac80211, since mt76_unregister_device() only\nunregisters the main hw. Unregister the ext PHY (thermal + phy + hw)\nfirst and skip the redundant free."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is in mt7915_register_device()\u0027s free_phy2 unwind, reached only from mt7915_pci_probe() and mt798x_wmac_probe() when mt7915_init_debugfs() or mt7915_coredump_register() fails after mt7915_register_ext_phy(); no 802.11 frame or nl80211 command supplies the triggering data.\nAC:H - mt7915_init_debugfs() always returns 0, so the live branch is mt7915_coredump_register() failing its vzalloc of struct mt7915_crash_data after mt7915_alloc_ext_phy() produced phy2 (DBDC). That one-shot ENOMEM during pci/platform probe is not something an attacker can reliably force.\nPR:L - After ieee80211_free_hw() on the still-registered ext PHY, mt76_unregister_device() drops only the main hw, leaving the ext wiphy, the default STA vif from ieee80211_register_hw(), and mt7915_thermal_ops (cdev-\u003edevdata = phy) reachable via nl80211 and thermal sysfs without init-namespace root or PCI bind capability.\nUI:N - No victim must mount media or open a file; once the probe unwind runs, udev, mac80211\u0027s leftover workqueue/inetaddr notifier, or the attacker\u2019s own nl80211/thermal access touches the still-registered ext PHY.\nS:U - ieee80211_free_hw() frees the ext PHY\u0027s ieee80211_local/wiphy/sband while mac80211 still holds it; impact is host-kernel heap corruption, not a VM, IOMMU, or sandbox escape.\nC:H - ieee80211_free_hw() kfree\u0027s the ext PHY\u0027s still-registered wiphy bands and wiphy_free()s the hw while cfg80211 and mt7915_thermal_get_cur_throttle_state() still dereference that phy via cdev-\u003edevdata, a UAF read primitive.\nI:H - The leftover ext-PHY object is written by mt7915_thermal_set_cur_throttle_state() (phy-\u003ecdev_state and mt7915_mcu_set_thermal_throttling) and by mac80211 workqueues never torn down by ieee80211_unregister_hw(), enabling UAF writes and control-flow hijack.\nA:H - ieee80211_free_hw() without ieee80211_unregister_hw() leaves mac80211 workqueues, inetaddr notifiers, and the default wlan vif running against freed ieee80211_local, which oopses or panics on the next access."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T17:54:48.057Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aa55bec92ba7747dd08feff409f8074c5e052e71"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad706fcf6255494613b94418e7243d98065dbeaf"
        },
        {
          "url": "https://git.kernel.org/stable/c/34058ad122f7524e33df8e38caba4b1d803b025a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a7fd3bae8e11a7c00df6a5021d9ef248ae9f9bf5"
        },
        {
          "url": "https://git.kernel.org/stable/c/648f5f03ff50d4bd719106ace0cdf1d8be02cbdd"
        },
        {
          "url": "https://git.kernel.org/stable/c/15b960014f24dce5388d4a2e7274e6490cb3c421"
        }
      ],
      "title": "wifi: mt76: mt7915: fix ext PHY use-after-free on register error path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90353",
    "datePublished": "2026-09-17T16:09:00.217Z",
    "dateReserved": "2026-09-11T19:38:34.805Z",
    "dateUpdated": "2026-09-18T17:54:48.057Z",
    "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.

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-R94P-VPQ4-R3GX

CVE-2026-90353 (GCVE-0-2026-90353)

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