Input: focaltech - fix array out-of-bounds in focaltech_process_rel_packet

Summary

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].

Timeline

1. Aug 26, 2026, 2:37 PM UTCCVE published
2. Oct 16, 2026, 7:17 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 16, 2026, 7:26 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 05be1d079ec0b3691783e4384b1ada82149ff7d2 · fixed in 063b4c6a6f3fc01bca085c442000c9c100fdbd93; From 05be1d079ec0b3691783e4384b1ada82149ff7d2 · fixed in bb502d79acb9ac1e0a77fa8bc7b7b4729140b11f; From 05be1d079ec0b3691783e4384b1ada82149ff7d2 · fixed in ca92c98b806839c108995b2bbff7061515bdfb53; From 05be1d079ec0b3691783e4384b1ada82149ff7d2 · fixed in 81b07470cb2937ceb74b00be88151582a322433b; From 05be1d079ec0b3691783e4384b1ada82149ff7d2 · fixed in 6f6d5fe29efdf5001bc146fc292e6592cace93eb; From 05be1d079ec0b3691783e4384b1ada82149ff7d2 · fixed in 83c265bfc084d77e2171d4b67362150ab38c935b; From 05be1d079ec0b3691783e4384b1ada82149ff7d2 · fixed in 1842e47126816e56d30c4f856f9854fd7831066c; From 05be1d079ec0b3691783e4384b1ada82149ff7d2 · fixed in 296736076b3fd078742651c719555a488624023a

• Linux Linux

  4.0

• KernelLinux

  From 4.0.0 · fixed in 5.10.266; From 5.11.0 · fixed in 5.15.217; From 5.16.0 · fixed in 6.1.184; From 6.2.0 · fixed in 6.6.153; From 6.7.0 · fixed in 6.12.105; From 6.13.0 · fixed in 6.18.46; From 6.19.0 · fixed in 7.1.10

References 8