CVE-2026-64366
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
In the Wacom HID driver (wacom_wac), the wacom_wac_queue_insert() function can call kfifo_skip() on an empty kfifo buffer, causing it to read garbage data and corrupt the internal kfifo state. This can lead to an out-of-bounds write beyond the 256-byte buffer, potentially writing up to 3842 bytes past the memory.
Risk Assessment
The vulnerability allows an out-of-bounds write in kernel memory, which can cause a system panic or potentially lead to privilege escalation.
Recommendation
It is recommended to update the Linux kernel to a version containing the fix, which adds a !kfifo_is_empty() condition before calling kfifo_skip() and checks the return value of kfifo_in().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: HID: wacom: fix slab-out-of-bounds write in wacom_wac_queue_insert wacom_wac_queue_insert() calls kfifo_skip() in a loop when the kfifo doesn't have enough space for the incoming report. If the kfifo is empty, kfifo_skip() reads stale data left in the kmalloc'd buffer via __kfifo_peek_n() and interprets it as a record length, advancing fifo->out by that garbage value. This corrupts the internal kfifo state, causing kfifo_unused() to return a value much larger than the actual buffer size, which bypasses __kfifo_in_r()'s guard: if (len + recsize > kfifo_unused(fifo)) return 0; kfifo_copy_in() then performs an out-of-bounds memcpy, writing up to 3842 bytes past the 256-byte buffer. Add a !kfifo_is_empty() condition to the while loop so kfifo_skip() is never called on an empty fifo, and check the return value of kfifo_in() to reject reports that are too large for the fifo.