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NVD / CVE Program· CNA Linux

CVE-2026-68194: wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses

—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 24475d2ddc8d8dfd82f4d2be0d951401f86911a6, 263816e92e8d66c81c98ccab2b5d2191ed08ec71, 7003a2cbddd7917933c1f169c7874cfa6ab852c3; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 24475d2ddc8d8dfd82f4d2be0d951401f86911a6, 263816e92e8d66c81c98ccab2b5d2191ed08ec71, 7003a2cbddd7917933c1f169c7874cfa6ab852c3; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses PKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7921_rx_check() and mt7921_queue_rx_skb() dispatch it to mt7921_mac_tx_free() on every bus. mt7921_mac_tx_free() cleans the DMA tx queues with mt76_queue_tx_cleanup(), which calls queue_ops->tx_cleanup(). Only the mmio queue ops implement that callback; on USB and SDIO it is NULL, so a TXRX_NOTIFY there calls a NULL pointer in the RX worker: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:0x0 Call Trace: mt7921_mac_tx_free+0x64/0x310 [mt7921_common] mt7921_rx_check+0x5f/0xf0 [mt7921_common] mt76u_rx_worker+0x1b9/0x620 [mt76_usb] Drop the event on non-mmio buses via mt76_is_mmio(), as in commit 5683e1488aa9 ("wifi: mt76: connac: do not check WED status for non-mmio devices").

Published
Aug 10, 2026
Updated
Aug 19, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.16affected
    • 48fab5bbef4092d925ab3214773ad12e68807223 and later · before 7003a2cbddd7917933c1f169c7874cfa6ab852c3affected · git
    • 48fab5bbef4092d925ab3214773ad12e68807223 and later · before ef2ee5f820c3ef87643b51e960c20b4a14d8336baffected · git
    • 48fab5bbef4092d925ab3214773ad12e68807223 and later · before ecf995b828191829ba4a87169bccabcbeb5c9c32affected · git
    • 48fab5bbef4092d925ab3214773ad12e68807223 and later · before 263816e92e8d66c81c98ccab2b5d2191ed08ec71affected · git
    • 48fab5bbef4092d925ab3214773ad12e68807223 and later · before 24475d2ddc8d8dfd82f4d2be0d951401f86911a6affected · git
    • 48fab5bbef4092d925ab3214773ad12e68807223 and later · before da4082e91acabc1498611ed8ccc53f0610baefc6affected · git
    • before 5.16not affected · semver
    • 6.1.183 and later · up to and including 6.1.*not affected · semver
    • 6.6.148 and later · up to and including 6.6.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-68191Aug 10, 2026 · wifi: ath12k: fix NULL pointer dereference in rhash table destroy
    0Monitor
  • ← EarlierCVE-2026-68193Aug 10, 2026 · wifi: mt76: mt7925: drop TXRX_NOTIFY on non-mmio buses
    0Monitor
  • Later →CVE-2026-68195Aug 10, 2026 · wifi: mt76: mt7615: drop TXRX_NOTIFY on non-mmio buses
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux24475d2ddc8d8dfd82f4d2be0d951401f86911a6Vendor (CNA)
Linux Linux263816e92e8d66c81c98ccab2b5d2191ed08ec71Vendor (CNA)
Linux Linux7003a2cbddd7917933c1f169c7874cfa6ab852c3Vendor (CNA)
Linux Linuxda4082e91acabc1498611ed8ccc53f0610baefc6Vendor (CNA)
Linux Linuxecf995b828191829ba4a87169bccabcbeb5c9c32Vendor (CNA)
Linux Linuxef2ee5f820c3ef87643b51e960c20b4a14d8336bVendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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