{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80933", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.802Z", "datePublished": "2026-09-11T19:42:07.754Z", "dateUpdated": "2026-10-19T08:45:17.026Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:45:17.026Z" }, "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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "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 → mt7996_register_device → mt7996_init_hardware → mt7996_eeprom_init → 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->data at MT_EE_WIFI_CONF, and a crafted WIFI_CONF that fails the match (or the common use_default fallback) takes memcpy(eeprom, fw->data, 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—an 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c" ], "versions": [ { "version": "98686cd21624c75a043e96812beadddf4f6f48e5", "lessThan": "b4bf67cc0871b13103c404b38e332b9d4403a0da", "status": "affected", "versionType": "git" }, { "version": "98686cd21624c75a043e96812beadddf4f6f48e5", "lessThan": "127a291f4c8069a4e71906938402cacfe24ee8cd", "status": "affected", "versionType": "git" }, { "version": "98686cd21624c75a043e96812beadddf4f6f48e5", "lessThan": "03b81f015dbb29807ce1ec6d45537d658abdac69", "status": "affected", "versionType": "git" }, { "version": "98686cd21624c75a043e96812beadddf4f6f48e5", "lessThan": "7074ec3769820302f1ccf8794a40a6582153b820", "status": "affected", "versionType": "git" }, { "version": "98686cd21624c75a043e96812beadddf4f6f48e5", "lessThan": "653c6e289b13cc6942f3e8f8e3c568e70fa42d1f", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/wireless/mediatek/mt76/mt7996/eeprom.c" ], "versions": [ { "version": "6.2", "status": "affected" }, { "version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.3" } ] } ] } ], "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" } } } }