Bug 2513485 (CVE-2026-68355)

Summary: CVE-2026-68355 kernel: wifi: ath11k: fix potential buffer underflow in ath11k_hal_rx_msdu_list_get()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the ath11k component of the Linux kernel. When processing Wi-Fi (wireless fidelity) data, a specific function can attempt to access memory outside of its allocated buffer. This buffer underflow occurs if the first entry in a data structure has a zero buffer address, leading to an out-of-bounds read. This could potentially lead to system instability or a denial of service (DoS).
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Description OSIDB Bzimport 2026-08-10 12:39:59 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-08-11 07:38:04 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081040-CVE-2026-68355-e340@gregkh/T