CVE-2026-80933 (GCVE-0-2026-80933)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-19 08:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7996: validate default EEPROM firmware size The default EEPROM firmware is parsed and copied as a full EEPROM without checking its length. A truncated file can make the driver read beyond the firmware buffer during variant validation or the fallback copy. Reject files shorter than MT7996_EEPROM_SIZE before parsing or copying the firmware.
References
Impacted products
Vendor Product Version
Linux Linux Version: 98686cd21624c75a043e96812beadddf4f6f48e5
Version: 98686cd21624c75a043e96812beadddf4f6f48e5
Version: 98686cd21624c75a043e96812beadddf4f6f48e5
Version: 98686cd21624c75a043e96812beadddf4f6f48e5
Version: 98686cd21624c75a043e96812beadddf4f6f48e5
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b4bf67cc0871b13103c404b38e332b9d4403a0da",
              "status": "affected",
              "version": "98686cd21624c75a043e96812beadddf4f6f48e5",
              "versionType": "git"
            },
            {
              "lessThan": "127a291f4c8069a4e71906938402cacfe24ee8cd",
              "status": "affected",
              "version": "98686cd21624c75a043e96812beadddf4f6f48e5",
              "versionType": "git"
            },
            {
              "lessThan": "03b81f015dbb29807ce1ec6d45537d658abdac69",
              "status": "affected",
              "version": "98686cd21624c75a043e96812beadddf4f6f48e5",
              "versionType": "git"
            },
            {
              "lessThan": "7074ec3769820302f1ccf8794a40a6582153b820",
              "status": "affected",
              "version": "98686cd21624c75a043e96812beadddf4f6f48e5",
              "versionType": "git"
            },
            {
              "lessThan": "653c6e289b13cc6942f3e8f8e3c568e70fa42d1f",
              "status": "affected",
              "version": "98686cd21624c75a043e96812beadddf4f6f48e5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "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": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7996: validate default EEPROM firmware size\n\nThe default EEPROM firmware is parsed and copied as a full EEPROM\nwithout checking its length. A truncated file can make the driver\nread beyond the firmware buffer during variant validation or the\nfallback copy.\n\nReject files shorter than MT7996_EEPROM_SIZE before parsing or\ncopying the firmware."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The truncated default EEPROM image is consumed only via request_firmware() on the local PCI probe path (mt7996_pci_probe \u2192 mt7996_register_device \u2192 mt7996_init_hardware \u2192 mt7996_eeprom_init \u2192 mt7996_eeprom_check_or_use_default); WiFi frames, network protocols, and USB traffic never reach this parser.\nAC:L - A non-empty file shorter than MT7996_EEPROM_SIZE (7680 bytes) deterministically over-reads: variant validation indexes fw-\u003edata at MT_EE_WIFI_CONF, and a crafted WIFI_CONF that fails the match (or the common use_default fallback) takes memcpy(eeprom, fw-\u003edata, 7680) with no race or layout luck.\nPR:L - The parse path has no capability check, and default EEPROM blobs live under /lib/firmware/mediatek/mt7996/ and vendor firmware partitions on OpenWrt/AP/Android Filogic deployments that are often writable by non-root system or OTA accounts, so a low-privileged local user can position the truncated image.\nUI:N - Once the truncated EEPROM firmware file is in place, request_firmware() and the subsequent parse/copy run automatically during driver probe at boot or module bind; no victim action such as opening a device node or mounting a filesystem is required.\nS:U - The out-of-bounds read and the EEPROM/MCU state it poisons remain inside the host kernel and the local MT7996 device; this is not a VM escape, IOMMU bypass, or other cross-authority breakout.\nC:H - memcpy(..., 7680) and mt7996_eeprom_parse_stream() read far past the firmware buffer into eeprom.data, which is then used as the interface MAC, exposed via the 0400 debugfs eeprom blob, and uploaded to the MCU\u2014an unbounded kernel-memory disclosure, not a few-byte leak.\nI:H - The fallback memcpy writes the over-read kernel memory into the live 7680-byte EEPROM object that then drives MAC/capability configuration and mt7996_mcu_set_eeprom() programming of the WiFi 7 MCU, so attacker-influenced data corrupts kernel and device control state; memory-corruption copies are rated High.\nA:H - Firmware buffers are vmalloc/vmap allocations with guard pages, so a 7680-byte over-read from a short file reliably faults into an unmapped page and oopses or panics the kernel during probe of MT7996/MT7992/MT7990 hardware."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:45:17.026Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b4bf67cc0871b13103c404b38e332b9d4403a0da"
        },
        {
          "url": "https://git.kernel.org/stable/c/127a291f4c8069a4e71906938402cacfe24ee8cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/03b81f015dbb29807ce1ec6d45537d658abdac69"
        },
        {
          "url": "https://git.kernel.org/stable/c/7074ec3769820302f1ccf8794a40a6582153b820"
        },
        {
          "url": "https://git.kernel.org/stable/c/653c6e289b13cc6942f3e8f8e3c568e70fa42d1f"
        }
      ],
      "title": "wifi: mt76: mt7996: validate default EEPROM firmware size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80933",
    "datePublished": "2026-09-11T19:42:07.754Z",
    "dateReserved": "2026-08-26T14:34:25.802Z",
    "dateUpdated": "2026-10-19T08:45:17.026Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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