CVE-2026-98192

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

wifi: wcn36xx: Fix potential use-after-free in TX ack timer teardown

wcn36xx_dxe_deinit() tears down the TX ack timer with timer_delete(),

which only dequeues the timer and does not wait for a callback that is

already executing; the preceding free_irq() calls synchronize the

interrupt handlers only. The callback, wcn36xx_dxe_tx_timer(), can

therefore be running past the teardown and use the wcn freed along

with the ieee80211_hw in wcn36xx_remove(): it takes wcn->dxe_lock,

reads wcn->tx_ack_skb and passes wcn->hw to

ieee80211_tx_status_irqsafe().

Fix this by using timer_shutdown_sync(), which waits for a running

callback and also prevents the timer from being rearmed again. The

timer is set up again by wcn36xx_dxe_init() on the next start, so the

start/stop cycle is unaffected.

This issue was found by an in-house static analysis tool.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References