CVE-2026-68355
Received Received - Intake

Buffer Underflow in Linux Kernel ath11k WiFi Driver

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: wifi: ath11k: fix potential buffer underflow in ath11k_hal_rx_msdu_list_get() When the first entry in msdu_details has a zero buffer address, the code accesses msdu_details[i - 1] with i == 0, causing a buffer underflow. Fix similarly to ath12k_wifi7_hal_rx_msdu_list_get() by adding a separate check for i == 0 before the main condition to prevent the out-of-bounds access. Found by Linux Verification Center (linuxtesting.org) with SVACE.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68355
EUVD
EUVD-2026-55456

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a buffer underflow vulnerability in the Linux kernel's ath11k WiFi driver. It occurs when the first entry in a list has a zero buffer address, causing the code to access an invalid memory location before the start of the list (i-1 when i=0).

Detection Guidance

This vulnerability is specific to the Linux kernel's ath11k Wi-Fi driver and involves a buffer underflow when processing certain network packets. Detection requires checking the kernel version and examining the ath11k driver code or logs for related errors. No direct commands are provided in the context to detect this issue.

Impact Analysis

This could lead to system crashes, unexpected behavior, or potential privilege escalation if exploited. It specifically affects systems using the ath11k WiFi driver.

Mitigation Strategies

Update your Linux kernel to the patched version that includes the fix for this vulnerability. Monitor kernel updates from your distribution and apply them promptly. If you are using a vulnerable kernel version, avoid using the ath11k Wi-Fi driver until the update is applied.

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