A NULL pointer dereference vulnerability exists in the Linux kernel's intel-ish-hid driver during the warm reset flow. (CVE-2026-45877)
A NULL pointer dereference vulnerability exists in the Linux kernel's intel-ish-hid driver during the warm reset flow. Specifically, the cl->device pointer may be NULL if a reset occurs while clients are still enumerating, leading to a kernel panic when the code accesses cl->device->reference_count without a NULL check. This issue was found during multi-unit warm reboot stress cycles and fixed by adding a defensive NULL check to improve stability.
AI Analysis
Technical Summary
The vulnerability (CVE-2026-45877) affects the intel-ish-hid component of the Linux kernel version 3.0. During a warm reset, if clients are still enumerating, the cl->device pointer can be NULL. The lack of a NULL check before accessing cl->device->reference_count causes a NULL pointer dereference, resulting in a kernel panic. This was identified under intensive multi-unit warm reboot stress testing. The fix involves adding a defensive NULL check in ishtp_bus_remove_all_clients to prevent the panic.
Potential Impact
The vulnerability causes a denial of service via kernel panic due to NULL pointer dereference. There is no impact on confidentiality or integrity. The affected system may become unstable or crash during warm reset operations under specific conditions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch links are provided, users should monitor official Microsoft Security Response Center advisories for updates. Until a fix is available, avoid performing warm resets under heavy client enumeration to reduce the risk of kernel panic.
A NULL pointer dereference vulnerability exists in the Linux kernel's intel-ish-hid driver during the warm reset flow. (CVE-2026-45877)
Description
A NULL pointer dereference vulnerability exists in the Linux kernel's intel-ish-hid driver during the warm reset flow. Specifically, the cl->device pointer may be NULL if a reset occurs while clients are still enumerating, leading to a kernel panic when the code accesses cl->device->reference_count without a NULL check. This issue was found during multi-unit warm reboot stress cycles and fixed by adding a defensive NULL check to improve stability.
CVSS v3.1
Score 5.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability (CVE-2026-45877) affects the intel-ish-hid component of the Linux kernel version 3.0. During a warm reset, if clients are still enumerating, the cl->device pointer can be NULL. The lack of a NULL check before accessing cl->device->reference_count causes a NULL pointer dereference, resulting in a kernel panic. This was identified under intensive multi-unit warm reboot stress testing. The fix involves adding a defensive NULL check in ishtp_bus_remove_all_clients to prevent the panic.
Potential Impact
The vulnerability causes a denial of service via kernel panic due to NULL pointer dereference. There is no impact on confidentiality or integrity. The affected system may become unstable or crash during warm reset operations under specific conditions.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch links are provided, users should monitor official Microsoft Security Response Center advisories for updates. Until a fix is available, avoid performing warm resets under heavy client enumeration to reduce the risk of kernel panic.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-45877
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- 3.1
Threat ID: 6a18ab98e29bf47b502897bb
Added to database: 05/28/2026, 20:54:48 UTC
Last enriched: 06/26/2026, 23:39:03 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 56
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