In the Linux kernel, the following vulnerability has been resolved: HID: logitech-dj: Fix maxfield check in DJ short report validation Commit… (CVE-2026-64427)
A vulnerability in the Linux kernel's HID Logitech DJ driver was resolved that involved improper validation of DJ short output reports. The flaw caused a NULL pointer dereference during device probe when a crafted report with zero fields was processed, leading to a kernel crash. This issue was fixed by rejecting zero-field reports before accessing their contents.
AI Analysis
Technical Summary
The Linux kernel HID Logitech DJ driver had a bug where validation of DJ short output reports incorrectly dereferenced rep->field[0] even when rep->maxfield was zero. This could occur if a crafted descriptor created a report ID with only padding output items, leaving rep->maxfield as zero. When the validation code entered the branch for rep->maxfield < 1, it dereferenced rep->field[0]->report_count while printing an error message, causing a NULL pointer dereference and kernel crash during device probe. The fix involves rejecting zero-field reports before accessing the field report_count, preventing the NULL pointer dereference.
Potential Impact
This vulnerability can cause a kernel NULL pointer dereference leading to a denial of service (kernel crash) during device probe when processing specially crafted HID reports. There is no indication of privilege escalation or code execution. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix has been applied in the Linux kernel to reject zero-field reports before accessing their contents, preventing the NULL pointer dereference. Users should update to the latest kernel versions containing this fix. Patch status is not explicitly stated; check the vendor or Linux kernel advisory for the exact fixed versions and apply updates accordingly.
In the Linux kernel, the following vulnerability has been resolved: HID: logitech-dj: Fix maxfield check in DJ short report validation Commit… (CVE-2026-64427)
Description
A vulnerability in the Linux kernel's HID Logitech DJ driver was resolved that involved improper validation of DJ short output reports. The flaw caused a NULL pointer dereference during device probe when a crafted report with zero fields was processed, leading to a kernel crash. This issue was fixed by rejecting zero-field reports before accessing their contents.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel HID Logitech DJ driver had a bug where validation of DJ short output reports incorrectly dereferenced rep->field[0] even when rep->maxfield was zero. This could occur if a crafted descriptor created a report ID with only padding output items, leaving rep->maxfield as zero. When the validation code entered the branch for rep->maxfield < 1, it dereferenced rep->field[0]->report_count while printing an error message, causing a NULL pointer dereference and kernel crash during device probe. The fix involves rejecting zero-field reports before accessing the field report_count, preventing the NULL pointer dereference.
Potential Impact
This vulnerability can cause a kernel NULL pointer dereference leading to a denial of service (kernel crash) during device probe when processing specially crafted HID reports. There is no indication of privilege escalation or code execution. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix has been applied in the Linux kernel to reject zero-field reports before accessing their contents, preventing the NULL pointer dereference. Users should update to the latest kernel versions containing this fix. Patch status is not explicitly stated; check the vendor or Linux kernel advisory for the exact fixed versions and apply updates accordingly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-m6mf-crm7-82wq
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64427"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a6542099c2644c7f80835c0
Added to database: 07/25/2026, 23:08:57 UTC
Last enriched: 08/10/2026, 20:38:04 UTC
Last updated: 09/07/2026, 10:52:10 UTC
Views: 47
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