CVE-2026-68355

System crash via first-entry buffer underflow

Published Aug 10, 2026 · Updated Aug 10, 2026

Buffer underflow in the ath11k Wi-Fi driver in affected Linux kernel branches allows local users to crash the system via a zero-address MSDU entry. The ath11k_hal_rx_msdu_list_get function reads the preceding msdu_details element when the first descriptor has a zero buffer address and the loop index is zero, producing an out-of-bounds read before the array. The path applies to systems using the ath11k Wi-Fi driver, and published scoring requires low local privileges; the bounded consequence is loss of system availability.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer underflow in the ath11k Wi-Fi driver in affected Linux kernel branches allows local users to crash the system via a zero-address MSDU entry. The ath11k_hal_rx_msdu_list_get function reads the preceding msdu_details element when the first descriptor has a zero buffer address and the loop index is zero, producing an out-of-bounds read before the array. The path applies to systems using the ath11k Wi-Fi driver, and published scoring requires low local privileges; the bounded consequence is loss of system availability.

The record

CVE
CVE-2026-68355
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-124, T1499.004
Attack vector
local
Privileges
authenticated

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=5.6
  2. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <69a6a4f60b2da92c0bdfd9264b8ffe053f51f52a
  3. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <725c1c3a8c5d920a7d3f5887412f2ad8e95a74f5
  4. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <7f11e70629650ff6ea140984e5ce188b775b2683
  5. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <904367381a922aa2dc3e8bd2488e6c9180516c7a
  6. Affected versionversion=d5c65159f2895379e11ca13f62feabe93278985d <a154ca3c441a67d36b3a9ea63a4f11b06abe6223

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=d5c65159f2895379e11ca13f62feabe93278985d <69a6a4f60b2da92c0bdfd9264b8ffe053f51f52a; version=d5c65159f2895379e11ca13f62feabe93278985d <725c1c3a8c5d920a7d3f5887412f2ad8e95a74f5; version=d5c65159f2895379e11ca13f62feabe93278985d <7f11e70629650ff6ea140984e5ce188b775b2683; version=d5c65159f2895379e11ca13f62feabe93278985d <904367381a922aa2dc3e8bd2488e6c9180516c7a; version=d5c65159f2895379e11ca13f62feabe93278985d <a154ca3c441a67d36b3a9ea63a4f11b06abe6223

Published CVSS scores

5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.2Amazon LinuxCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-124Buffer Underwrite ('Buffer Underflow')
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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