CVE-2026-45877 HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients
A NULL pointer dereference in the Intel ISH HID driver during warm resets can cause a kernel panic, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45877?
CVE-2026-45877 is a medium-severity vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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]
Weakness: CWE-476
Which versions are affected by CVE-2026-45877?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-45877?
Apply the vendor's patch.
Is CVE-2026-45877 being exploited?
There is no known exploitation of CVE-2026-45877 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88637, BELL-CVE-2026-45877, DEBIAN-CVE-2026-45877, GHSA-69w2-j9pm-3jxm, ROOT-OS-DEBIAN-11-CVE-2026-45877, ROOT-OS-DEBIAN-12-CVE-2026-45877 and 3 more.