Medium [CVE-2026-68191] fix NULL pointer dereference in rhash table destroy
This medium-severity Red Hat Linux advisory covers CVE-2026-68191 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat package: kernel-rt.
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Summary
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 irq_work_sync() called from rhashtable_destroy().
Two hash tables are affected: 1. ath12k_link_sta hash table in ath12k_base 2. ath12k_dp_link_peer 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.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat package: kernel-rt.
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 ath12k 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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