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

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Summary

CVECVE-2026-68191
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:06 UTC
Updated2026-08-17 05:18:20 UTC
DescriptionIn 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. Call trace for ath12k_link_sta_rhash_tbl_destroy: RIP: irq_work_sync+0x1e/0x70 rhashtable_destroy+0x12/0x60 ath12k_link_sta_rhash_tbl_destroy+0x19/0x40 [ath12k] ath12k_core_stop+0xe/0x80 [ath12k] ath12k_core_hw_group_cleanup+0x6b/0xb0 [ath12k] ath12k_pci_remove+0x60/0x110 [ath12k] Call trace for ath12k_dp_link_peer_rhash_tbl_destroy: RIP: irq_work_sync+0x1e/0x70 rhashtable_destroy+0x12/0x60 ath12k_dp_link_peer_rhash_tbl_destroy+0x29/0x50 [ath12k] ath12k_dp_cmn_device_deinit+0x21/0x140 [ath12k] ath12k_core_hw_group_cleanup+0x6b/0xb0 [ath12k] ath12k_pci_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.

Risk And Classification

EPSS: 0.001890000 probability, percentile 0.088810000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 57ccca410237285f8f25a988655e6910cadc63f2 17a4298f7794843af0094035723dc5e7311c7453 git Not specified
CNA Linux Linux affected 57ccca410237285f8f25a988655e6910cadc63f2 70231dcd782201579990ded73e0435d18bb524ca git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/70231dcd782201579990ded73e0435d18bb524ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/17a4298f7794843af0094035723dc5e7311c7453 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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