CVE-2026-68373

Kernel disclosure and crash via length underflow

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds read in affected Linux kernels allows physically proximate attackers to disclose kernel data or crash systems via Wi-Fi frames. The at76_guess_freq() function subtracts a 36-byte management-body offset after checking only for a 24-byte header, wrapping a truncated frame length before cfg80211_find_elem_match() walks past the receive buffer. Exploitation requires an at76c50x USB WLAN device to receive a truncated beacon or probe response while scanning; the over-read can expose adjacent kernel heap data or cause a kernel panic.

CVSS severity8.1
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in affected Linux kernels allows physically proximate attackers to disclose kernel data or crash systems via Wi-Fi frames. The at76_guess_freq() function subtracts a 36-byte management-body offset after checking only for a 24-byte header, wrapping a truncated frame length before cfg80211_find_elem_match() walks past the receive buffer. Exploitation requires an at76c50x USB WLAN device to receive a truncated beacon or probe response while scanning; the over-read can expose adjacent kernel heap data or cause a kernel panic.

The record

CVE
CVE-2026-68373
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=1264b951463a00efebe1bb596499aaad620ec8af <61a799ffd1e5a4fd3702d547828b7ff3d161468e
  2. Affected versionversion=1264b951463a00efebe1bb596499aaad620ec8af <bcde7249d45f52f994a9872bedf45994472ade77
  3. Affected versionversion=1264b951463a00efebe1bb596499aaad620ec8af <e165a1d295e7e814e13b0f92c86e5d48309509ce
  4. Affected versionversion=1264b951463a00efebe1bb596499aaad620ec8af <f742d9c98b5c504fc9e6744eef13a721c2aea486
  5. Affected versionversion=1264b951463a00efebe1bb596499aaad620ec8af <fb1b50ab699211e777dca5ccfb648788b6a6e519
  6. Affected versionversion=2.6.30

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1264b951463a00efebe1bb596499aaad620ec8af <61a799ffd1e5a4fd3702d547828b7ff3d161468e; version=1264b951463a00efebe1bb596499aaad620ec8af <bcde7249d45f52f994a9872bedf45994472ade77; version=1264b951463a00efebe1bb596499aaad620ec8af <e165a1d295e7e814e13b0f92c86e5d48309509ce; version=1264b951463a00efebe1bb596499aaad620ec8af <f742d9c98b5c504fc9e6744eef13a721c2aea486; version=1264b951463a00efebe1bb596499aaad620ec8af <fb1b50ab699211e777dca5ccfb648788b6a6e519; version=2.6.30

Published CVSS scores

8.1LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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