HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients

Summary

In the Linux kernel, the following vulnerability has been resolved: HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients During a warm reset flow, the cl->device pointer may be NULL if the reset occurs while clients are still being enumerated. Accessing cl->device->reference_count without a NULL check leads to a kernel panic. This issue was identified during multi-unit warm reboot stress clycles. Add a defensive NULL check for cl->device to ensure stability under such intensive testing conditions. KASAN: null-ptr-deref in range [0000000000000000-0000000000000007] Workqueue: ish_fw_update_wq fw_reset_work_fn Call Trace: ishtp_bus_remove_all_clients+0xbe/0x130 [intel_ishtp] ishtp_reset_handler+0x85/0x1a0 [intel_ishtp] fw_reset_work_fn+0x8a/0xc0 [intel_ish_ipc]

Timeline

1. May 27, 2026, 12:16 PM UTCCVE published
2. Oct 21, 2026, 12:40 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 3703f53b99e4a7c373ce3568dd3f91f175ebb626 · fixed in cde7f709d1025dadfc52e903e43981c1644bd8bd; From 3703f53b99e4a7c373ce3568dd3f91f175ebb626 · fixed in 0b605e8ce60698c27a26f512968a597fd620d2e8; From 3703f53b99e4a7c373ce3568dd3f91f175ebb626 · fixed in feb4bcfd405282de60aba321f13a1272b30c5af4; From 3703f53b99e4a7c373ce3568dd3f91f175ebb626 · fixed in 272dac57caa981718e7188c80c703e7bb1998054; From 3703f53b99e4a7c373ce3568dd3f91f175ebb626 · fixed in 56f7db581ee73af53cd512e00a6261a025bf1d58

• Linux Linux

  4.9

• KernelLinux

  From 4.9.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.75; From 6.13.0 · fixed in 6.18.14; From 6.19.0 · fixed in 6.19.4

References 5