Bug 2513476 (CVE-2026-68199)

Summary: CVE-2026-68199 kernel: wifi: ath6kl: fix OOB access from firmware ADDBA window size
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's `ath6kl` Wi-Fi driver. This vulnerability allows a local attacker to cause an out-of-bounds memory access. The flaw occurs when the firmware provides an invalid window size during an ADDBA (Add Block Ack) request, leading to incorrect memory allocation. This can result in a denial of service or potentially lead to further system compromise.
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Description OSIDB Bzimport 2026-08-10 12:39:30 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: ath6kl: fix OOB access from firmware ADDBA window size

aggr_recv_addba_req_evt() logs a debug message when the firmware-supplied
win_sz is outside [AGGR_WIN_SZ_MIN, AGGR_WIN_SZ_MAX] but does not
return. The out-of-range win_sz is then used in TID_WINDOW_SZ() to
compute a kzalloc size and stored in rxtid->hold_q_sz, leading to
zero-size or overflowed allocations and subsequent out-of-bounds access.

Clean up any previously active aggregation session for the TID first,
then return early when win_sz is out of the valid range, instead of
proceeding with a broken allocation size.
Comment 1 Mauro Matteo Cascella 2026-08-11 08:07:08 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081011-CVE-2026-68199-3503@gregkh/T