wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90379
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:37 UTC
Updated2026-09-18 18:17:55 UTC
DescriptionIn 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 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.002390000 probability, percentile 0.152150000 (date 2026-09-21)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 17f1de56df051229988aab37e01971c9713c4a31 670b3dc4e3713542a9f002d38fb9d1740b9e342b git Not specified
CNA Linux Linux affected 17f1de56df051229988aab37e01971c9713c4a31 f544bcba4721e1074e9bc6666f0ef4f8b96ddba8 git Not specified
CNA Linux Linux affected 17f1de56df051229988aab37e01971c9713c4a31 915672c5ae32deeb72f4572856d123f314791136 git Not specified
CNA Linux Linux affected 4.16 Not specified
CNA Linux Linux unaffected 4.16 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/670b3dc4e3713542a9f002d38fb9d1740b9e342b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/915672c5ae32deeb72f4572856d123f314791136 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f544bcba4721e1074e9bc6666f0ef4f8b96ddba8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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