# CVE-2026-45877: HID: intel-ish-hid: fix NULL-ptr-deref in ishtp_bus_remove_all_clients

Status: published. Published: 2026-05-27. Updated: 2026-11-06.

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]

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 3703f53b99e4a7c373ce3568dd3f91f175ebb626; < 08baf418d79d289a7bc38be519289b3a48b83da9 (affected, git); ≥ 3703f53b99e4a7c373ce3568dd3f91f175ebb626; < cde7f709d1025dadfc52e903e43981c1644bd8bd (affected, git); ≥ 3703f53b99e4a7c373ce3568dd3f91f175ebb626; < 0b605e8ce60698c27a26f512968a597fd620d2e8 (affected, git); ≥ 3703f53b99e4a7c373ce3568dd3f91f175ebb626; < feb4bcfd405282de60aba321f13a1272b30c5af4 (affected, git); ≥ 3703f53b99e4a7c373ce3568dd3f91f175ebb626; < 272dac57caa981718e7188c80c703e7bb1998054 (affected, git); ≥ 3703f53b99e4a7c373ce3568dd3f91f175ebb626; < 56f7db581ee73af53cd512e00a6261a025bf1d58 (affected, git). Source: CNA: Linux
- Linux / Linux: 4.9 (affected); ≥ 0; < 4.9 (unaffected, semver); ≥ 6.1.191; ≤ 6.1.* (unaffected, semver); ≥ 6.6.160; ≤ 6.6.* (unaffected, semver); ≥ 6.12.75; ≤ 6.12.* (unaffected, semver); ≥ 6.18.14; ≤ 6.18.* (unaffected, semver); ≥ 6.19.4; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-06; percentile 7.90%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/08baf418d79d289a7bc38be519289b3a48b83da9 (CNA: Linux)

- https://git.kernel.org/stable/c/cde7f709d1025dadfc52e903e43981c1644bd8bd (CNA: Linux)

- https://git.kernel.org/stable/c/0b605e8ce60698c27a26f512968a597fd620d2e8 (CNA: Linux)

- https://git.kernel.org/stable/c/feb4bcfd405282de60aba321f13a1272b30c5af4 (CNA: Linux)

- https://git.kernel.org/stable/c/272dac57caa981718e7188c80c703e7bb1998054 (CNA: Linux)

- https://git.kernel.org/stable/c/56f7db581ee73af53cd512e00a6261a025bf1d58 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-45877; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-45877; retrieved 2026-11-06; source updated Not reported

Revision: edf9888edb2a68219d5decb2eca100efcd8592ed21662fae49701375bdd9964e

Canonical: https://y2.dev/cve/CVE-2026-45877

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