CVE-2026-68191

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

wifi: ath12k: fix NULL pointer dereference in rhash table destroy

When unbinding the ath12k driver, kernel NULL pointer dereferences occur in irqworksync() called from rhashtable_destroy().

Two hash tables are affected: 1. ath12klinksta hash table in ath12kbase 2. ath12kdplinkpeer hash table in ath12k_dp

The issue happens because the destroy functions are called unconditionally in cleanup paths, but the hash tables are only initialized late in their respective init functions. If the device was never fully started or if the init functions failed before initializing the hash tables, the pointers will be NULL. The issues are always reproducible from a VM because the MSI addressing initialization is failing.

Call trace for ath12klinkstarhashtbldestroy: RIP: irqworksync+0x1e/0x70 rhashtabledestroy+0x12/0x60 ath12klinkstarhashtbldestroy+0x19/0x40 [ath12k] ath12kcorestop+0xe/0x80 [ath12k] ath12kcorehwgroupcleanup+0x6b/0xb0 [ath12k] ath12kpci_remove+0x60/0x110 [ath12k]

Call trace for ath12kdplinkpeerrhashtbldestroy: RIP: irqworksync+0x1e/0x70 rhashtabledestroy+0x12/0x60 ath12kdplinkpeerrhashtbldestroy+0x29/0x50 [ath12k] ath12kdpcmndevicedeinit+0x21/0x140 [ath12k] ath12kcorehwgroupcleanup+0x6b/0xb0 [ath12k] ath12kpci_remove+0x60/0x110 [ath12k]

Fix this by adding NULL checks before calling rhashtable_destroy() in both destroy functions.

The NULL check approach was chosen because the rhashtable pointer serves as the initialization state indicator. The init can fail at various points, leaving some components uninitialized. Checking the pointer directly is simpler than adding separate state flags that would need synchronization.