CVE-2023-53679

Kernel crash via mt7601u RX length underflow

Published Oct 7, 2025 · Updated Oct 7, 2025

Integer underflow in the Linux kernel mt7601u Wi-Fi driver allows physically proximate attackers to crash the kernel via a crafted RX segment. A dma_len value below min_seg_len underflows seg_len, bypasses the bad_frame checks in mt7601u_rx_skb_from_seg(), and causes a NULL p pointer dereference. Reachability requires an MT7601U USB Wi-Fi device with the mt7601u driver receiving attacker-controlled wireless traffic; the documented consequence is a kernel crash.

CVSS severity8.3
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in the Linux kernel mt7601u Wi-Fi driver allows physically proximate attackers to crash the kernel via a crafted RX segment. A dma_len value below min_seg_len underflows seg_len, bypasses the bad_frame checks in mt7601u_rx_skb_from_seg(), and causes a NULL p pointer dereference. Reachability requires an MT7601U USB Wi-Fi device with the mt7601u driver receiving attacker-controlled wireless traffic; the documented consequence is a kernel crash.

The record

CVE
CVE-2023-53679
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-191, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1a1f43059afae5cc9409e0c3bc63bfc09bc8facb
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47dc1f425af57b71111d7b01ebd24e04e8d967ef
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <61d0163e2be7a439cf6f82e9ad7de563ecf41e7a
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67e4519afba215199b6dfa39ce5d7ea673ee4138
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <803f3176c5df3b5582c27ea690f204abb60b19b9
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0db59e2f718d1e2f1d2a2d8092168fdd2f3add0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1a1f43059afae5cc9409e0c3bc63bfc09bc8facb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <47dc1f425af57b71111d7b01ebd24e04e8d967ef; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <61d0163e2be7a439cf6f82e9ad7de563ecf41e7a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <67e4519afba215199b6dfa39ce5d7ea673ee4138; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <803f3176c5df3b5582c27ea690f204abb60b19b9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0db59e2f718d1e2f1d2a2d8092168fdd2f3add0

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.3kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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