CVE-2026-80783
UnknownSummary
In the Linux kernel's HID magicmouse driver, a vulnerability allows unbounded recursion in magicmouse_raw_event(). A malicious HID device can send a report with the sequence [0xf7, 0x00], causing thousands of nested calls and kernel stack overflow. The fix bounds recursion depth to two levels.
Risk Assessment
By connecting a malicious HID device, an attacker can cause kernel stack overflow, leading to system panic or memory corruption.
Recommendation
Install the Linux kernel update containing the fix for CVE-2026-80783. Restrict the ability to connect unknown HID devices.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: HID: magicmouse: prevent unbounded recursion in magicmouse_raw_event() magicmouse_raw_event() handles DOUBLE_REPORT_ID (0xf7) packets, which pack two touch reports into one, by splitting the packet and calling itself on each half. The only guard against runaway recursion is a "size < 1" check, which stops zero-sized calls but does not bound the recursion depth. A malicious HID device that matches this driver can send a report starting with DOUBLE_REPORT_ID and filled with the sequence [0xf7, 0x00]. Each level consumes two bytes and recurses on the remainder, so an incoming report of up to HID_MAX_BUFFER_SIZE (16 KiB) drives roughly 8000 nested calls. That easily exhausts the 16 KiB kernel stack, leading to a stack overflow: a panic with CONFIG_VMAP_STACK, or memory corruption without it. A double report only ever wraps two normal reports; it is never legitimately nested. Refuse to re-enter the DOUBLE_REPORT_ID case from a recursive call so the recursion depth is bounded to two, while all valid packets keep being parsed exactly as before.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS