CVE-2026-93053 in Linux
摘要
由 MITRE • 2026-09-17
In the Linux kernel, the following vulnerability has been resolved:
speakup: keyhelp: guard letter_offsets possible out-of-range indexing
help_init() builds letter_offsets[] by using the first byte of each
function name as an index via `(start & 31) - 1`. If function_names are overridden from sysfs (root) with a name starting outside [a–z], the
index underflows or exceeds the array, leading to OOB write.
Function names can be overridden with the following commands as root:
modprobe speakup_soft echo "0 _bad" > /sys/accessibility/speakup/i18n/function_names # then press Insert+2 on /dev/tty
This fix checks the first letter in help_init(), and if it is not in the [a–z] range the function returns an error to the caller. Eventually this
error is propagated to drivers/accessibility/speakup/main.c:2217, which causes a bleep sound.
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