CVE-2026-80934Hinoki check available

Service interruption via AddBA DMA mapping leak

Published Sep 11, 2026 · Updated Sep 11, 2026

Denial of service in Linux 6.17.8 through 6.18 allows attackers to interrupt Wi-Fi and on-SoC DMA consumers via client reconnect churn. mt76_connac_txp_skb_unmap() treats the mt7996/mt7992 MAC-TXP descriptor as FW-TXP, reads the AddBA TID alias as a zero buffer count, and leaves buf[1] mapped. With WED enabled, each association leaks a bounced DMA mapping; sustained reconnects exhaust the swiotlb pool after about one to two days, stopping mappings for WED, the Wi-Fi MCU, and other consumers.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in Linux 6.17.8 through 6.18 allows attackers to interrupt Wi-Fi and on-SoC DMA consumers via client reconnect churn. mt76_connac_txp_skb_unmap() treats the mt7996/mt7992 MAC-TXP descriptor as FW-TXP, reads the AddBA TID alias as a zero buffer count, and leaves buf[1] mapped. With WED enabled, each association leaks a bounced DMA mapping; sustained reconnects exhaust the swiotlb pool after about one to two days, stopping mappings for WED, the Wi-Fi MCU, and other consumers.

The record

CVE
CVE-2026-80934
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.002
Attack vector
adjacent
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.17.8 <6.18
  2. Affected versionversion=6.18
  3. Affected versionversion=91a5a48702e948e45df01a4f2fd54a0b0d0d6efb
  4. Affected versionversion=cb6ebbdffef2a888b95f121637cd1fad473919c6 <01f2e0da8548f82d704b65b513026cfedc5f8962
  5. Affected versionversion=cb6ebbdffef2a888b95f121637cd1fad473919c6 <b754d3a6d44c53d9853eba374d8a7ef279a9d00a
  6. Affected versionversion=cb6ebbdffef2a888b95f121637cd1fad473919c6 <deaa2e3656937fbbe312f0ee2616c756c6e2511f

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.17.8 <6.18; version=6.18; version=91a5a48702e948e45df01a4f2fd54a0b0d0d6efb; version=cb6ebbdffef2a888b95f121637cd1fad473919c6 <01f2e0da8548f82d704b65b513026cfedc5f8962; version=cb6ebbdffef2a888b95f121637cd1fad473919c6 <b754d3a6d44c53d9853eba374d8a7ef279a9d00a; version=cb6ebbdffef2a888b95f121637cd1fad473919c6 <deaa2e3656937fbbe312f0ee2616c756c6e2511f

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.002Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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