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CVE-2021-47097 is a stack out-of-bounds read in the Linux kernel Elantech PS/2 input driver. In elantech_change_report_id(), the local stack buffer param[] was allocated for two bytes but was passed through elantech_read_reg_params() to ps2_command() using PSMOUSE_CMD_GETINFO, which reads three bytes. The one-byte size mismatch causes an invalid stack read during Elantech device interrogation and initialization. The upstream correction expands the local buffer to three bytes.
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Linux kernel Elantech input-driver stack out-of-bounds access flaw.
A Linux kernel Input subsystem vulnerability in the Elantech driver, involving an out-of-bounds stack access in elantech_change_report_id(). The issue is rated medium severity/priority in the referenced record, with automated assessment indicating a potentially valid moderate-impact KASAN out-of-bounds read finding.
A Linux kernel Elantech input-driver out-of-bounds stack read in elantech_change_report_id(). A local attacker can cause a denial-of-service crash or disclose kernel-internal information, potentially including data useful for bypassing protections such as ASLR.
A Linux kernel Elantech touchpad-driver stack out-of-bounds read in elantech_change_report_id(). A two-byte local parameter array is passed to logic that reads three bytes. The flaw affects drivers/input/mouse/elantech.c and is corrected by defining param[] as a three-byte array.
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