CVE-2026-64366 (GCVE-0-2026-64366)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-10-19 20:38
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5e013ad206895e72d7da41bc1ae89d8cb499c3aa
Version: 5e013ad206895e72d7da41bc1ae89d8cb499c3aa
Version: 5e013ad206895e72d7da41bc1ae89d8cb499c3aa
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