Description
In the Linux kernel, the following vulnerability has been resolved: Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet Make finger2 (and also finger1) unsigned, so that if the finger index in the packet is 0 then subtracting 1 creates an array index which overflows above the existing check for FOC_MAX_FINGERS, as the existing comment says it should, instead of writing to state->fingers[-1].
References8
- git.kernel.org/stable/c/063b4c6a6f3fc01bca085c442000c9c100fdbd93
- git.kernel.org/stable/c/1842e47126816e56d30c4f856f9854fd7831066c
- git.kernel.org/stable/c/296736076b3fd078742651c719555a488624023a
- git.kernel.org/stable/c/6f6d5fe29efdf5001bc146fc292e6592cace93eb
- git.kernel.org/stable/c/81b07470cb2937ceb74b00be88151582a322433b
- git.kernel.org/stable/c/83c265bfc084d77e2171d4b67362150ab38c935b
- git.kernel.org/stable/c/bb502d79acb9ac1e0a77fa8bc7b7b4729140b11f
- git.kernel.org/stable/c/ca92c98b806839c108995b2bbff7061515bdfb53
Metrics
- CVSS 3.1
-
8.4
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 9 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.