Bug 2482144 (CVE-2026-45877)

Summary: CVE-2026-45877 kernel: HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Intel Integrated Sensor Hub (ISH) HID driver. During a warm reset, a NULL-pointer dereference can occur if clients are still being enumerated. This can lead to a kernel panic, causing the system to become unstable or unavailable, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-05-27 15:13:27 UTC 
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]
Comment 1 Keith Grant 2026-05-28 03:28:13 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052714-CVE-2026-45877-f416@gregkh/T