{"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":"2026-09-14T11:59:00.078Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-14T11:59:00.078Z"},"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-rc1","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-rc1"}]}]}],"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"}}}}