Medium [CVE-2026-68353] fix OOB read from firmware num_msg in TX complete handler
This medium-severity Red Hat Linux advisory covers CVE-2026-68353 affecting Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: fix OOB read from firmware num_msg in TX complete handler The firmware-controlled num_msg field (u8, 0-255) drives the loop in ath6kl_wmi_tx_complete_event_rx() without validation against the buffer length.
This allows out-of-bounds reads of up to 1020 bytes past the WMI event buffer when the firmware sends an inflated num_msg. Add a check that the buffer is large enough to hold the fixed struct and the num_msg variable-length entries.
The `ath6kl_wmi_tx_complete_event_rx()` function, responsible for handling Wi-Fi messages, does not properly validate the `num_msg` field provided by the firmware against the buffer length. This could result in information disclosure or potentially a denial of service.
This issue affects Qualcomm ath6kl Wi-Fi. TX complete handler loops on firmware num_msg without buffer bounds check, allowing large OOB reads.
Systems without ath6kl hardware are not affected. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Mitigation checklist
- To mitigate this issue, prevent the ath6kl module from loading. See https://access.redhat.com/solutions/41278 for instructions.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
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