CVE-2026-90379
In the Linux kernel, the following vulnerability has been resolved:
wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
When an AER error occurs and the bus is hung, the register reads return 0xFFFFFFFF, causing the DMA queue state to be corrupted and resulting in an invalid memory access when accessing q->desc[] or q->entry[].
Unable to handle kernel paging request at virtual address ffffffc01099eac0 pc : mt76_dma_add_buf+0x124/0x188 [mt76] lr : mt76_dma_rx_fill+0x11c/0x1d8 [mt76] sp : ffffffc016d9bbf0 x29: ffffffc016d9bc10 x28: 0000000000000000 x27: 0000000000000000 x26: ffffffb7855e50b8 x25: ffffffb80d04f000 x24: 0000000000000000 x23: 0000000000000ec0 x22: ffffffb796803648 x21: ffffffb796801f80 x20: ffffffb7968035f8 x19: 0000000000000ec0 x18: 0000000000000000 x17: 000000004ec00000 x16: 000000000ec00000 x15: ffffffc01099eac0 x14: 000000004ec00000 x13: 00000000ffc5a000 x12: ffffffc016d9bc32 x11: 00000000ffffffff x10: 0000000000000002 x9 : 0000000000000000 x8 : 000000000000b4ac x7 : 0000000000000a20 x6 : ffffffb6c1806400 x5 : 0000000000000000 x4 : ffffffb80d04f000 x3 : 0000000000000000 x2 : 0000000000000001 x1 : 000000000ec04000 x0 : ffffffb7968035f8 Call trace: mt76_dma_add_buf+0x124/0x188 [mt76 (HASH:1029 4)] mt76_dma_rx_reset+0xe8/0xfc [mt76 (HASH:1029 4)] mt7921_wpdma_reset+0x188/0x1b0 [mt7921e (HASH:ee48 5)] mt7921e_mac_reset+0x128/0x418 [mt7921e (HASH:ee48 5)] mt7921_mac_reset_work+0xac/0x1a8 [mt7921_common (HASH:f721 6)] process_one_work+0x188/0x514 worker_thread+0x12c/0x300 kthread+0x140/0x1fc ret_from_fork+0x10/0x30
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Fix the invalid memory access by validating the DMA index read from the hardware before it is used as a queue index. An out-of-range value, such as the 0xFFFFFFFF returned while the bus is hung, is now clamped so it can no longer corrupt q->head or q->tail. In addition, check the bus_hung flag in mt7921_mac_reset_work() before attempting the reset sequence, reject MCU messages while the bus is hung, and install no-op bus operations when an unrecoverable AER error is detected, preventing further invalid hardware accesses.
Due to hardware limitations - such as the lack of a connected hardware reset pin or the absence of host re-probe functionality - affected Wi-Fi devices may not fully recover to a normal operational state after certain errors, even with AER enabled.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 8.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.38%
- Percentil entre todas las CVEs puntuadas: 29
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1210Exploitation of Remote Serviceslateral movement25 % - Impacto principal
T1499.004Application or System Exploitationimpact65 % - Impacto secundario
T1005Data from Local Systemcollection35 %
Vulnerabilidad en controlador WiFi Linux AV:A que causa crash por acceso inválido a memoria cuando bus AER cuelga; impacta disponibilidad (DoS) y potencialmente exposición de datos en kernel.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
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{
"id": "CVE-2026-90379",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Secondary",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 8.8,
"attackVector": "ADJACENT_NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 2.8
}
]
},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "17f1de56df051229988aab37e01971c9713c4a31",
"lessThan": "670b3dc4e3713542a9f002d38fb9d1740b9e342b",
"versionType": "git"
},
{
"status": "affected",
"version": "17f1de56df051229988aab37e01971c9713c4a31",
"lessThan": "f544bcba4721e1074e9bc6666f0ef4f8b96ddba8",
"versionType": "git"
},
{
"status": "affected",
"version": "17f1de56df051229988aab37e01971c9713c4a31",
"lessThan": "915672c5ae32deeb72f4572856d123f314791136",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/wireless/mediatek/mt76/dma.c",
"drivers/net/wireless/mediatek/mt76/mcu.c",
"drivers/net/wireless/mediatek/mt76/mt76_connac.h",
"drivers/net/wireless/mediatek/mt76/mt7921/mac.c",
"drivers/net/wireless/mediatek/mt76/mt7921/pci.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/wireless/mediatek/mt76/dma.c",
"drivers/net/wireless/mediatek/mt76/mcu.c",
"drivers/net/wireless/mediatek/mt76/mt76_connac.h",
"drivers/net/wireless/mediatek/mt76/mt7921/mac.c",
"drivers/net/wireless/mediatek/mt76/mt7921/pci.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-17T17:17:37.170",
"references": [
{
"url": "https://git.kernel.org/stable/c/670b3dc4e3713542a9f002d38fb9d1740b9e342b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/915672c5ae32deeb72f4572856d123f314791136",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f544bcba4721e1074e9bc6666f0ef4f8b96ddba8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash\n\nWhen an AER error occurs and the bus is hung, the register reads return\n0xFFFFFFFF, causing the DMA queue state to be corrupted and resulting in\nan invalid memory access when accessing q->desc[] or q->entry[].\n\nUnable to handle kernel paging request at virtual address\nffffffc01099eac0\npc : mt76_dma_add_buf+0x124/0x188 [mt76]\nlr : mt76_dma_rx_fill+0x11c/0x1d8 [mt76]\nsp : ffffffc016d9bbf0\nx29: ffffffc016d9bc10 x28: 0000000000000000\nx27: 0000000000000000 x26: ffffffb7855e50b8\nx25: ffffffb80d04f000 x24: 0000000000000000\nx23: 0000000000000ec0 x22: ffffffb796803648\nx21: ffffffb796801f80 x20: ffffffb7968035f8\nx19: 0000000000000ec0 x18: 0000000000000000\nx17: 000000004ec00000 x16: 000000000ec00000\nx15: ffffffc01099eac0 x14: 000000004ec00000\nx13: 00000000ffc5a000 x12: ffffffc016d9bc32\nx11: 00000000ffffffff x10: 0000000000000002\nx9 : 0000000000000000 x8 : 000000000000b4ac\nx7 : 0000000000000a20 x6 : ffffffb6c1806400\nx5 : 0000000000000000 x4 : ffffffb80d04f000\nx3 : 0000000000000000 x2 : 0000000000000001\nx1 : 000000000ec04000 x0 : ffffffb7968035f8\nCall trace:\n mt76_dma_add_buf+0x124/0x188 [mt76 (HASH:1029 4)]\n mt76_dma_rx_reset+0xe8/0xfc [mt76 (HASH:1029 4)]\n mt7921_wpdma_reset+0x188/0x1b0 [mt7921e (HASH:ee48 5)]\n mt7921e_mac_reset+0x128/0x418 [mt7921e (HASH:ee48 5)]\n mt7921_mac_reset_work+0xac/0x1a8 [mt7921_common (HASH:f721 6)]\n process_one_work+0x188/0x514\n worker_thread+0x12c/0x300\n kthread+0x140/0x1fc\n ret_from_fork+0x10/0x30\n\nFix the invalid memory access by validating the DMA index read from the\nhardware before it is used as a queue index. An out-of-range value, such\nas the 0xFFFFFFFF returned while the bus is hung, is now clamped so it can\nno longer corrupt q->head or q->tail. In addition, check the bus_hung flag\nin mt7921_mac_reset_work() before attempting the reset sequence, reject MCU\nmessages while the bus is hung, and install no-op bus operations when an\nunrecoverable AER error is detected, preventing further invalid hardware\naccesses.\n\nDue to hardware limitations - such as the lack of a connected hardware\nreset pin or the absence of host re-probe functionality - affected Wi-Fi\ndevices may not fully recover to a normal operational state after\ncertain errors, even with AER enabled."
}
],
"lastModified": "2026-09-18T18:17:55.917",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}