Threats Tagged 'cve-2026-46088'

A vulnerability in the Linux kernel ALSA control component was identified where the function snd_ctl_elem_init_enum_names() could call strnlen() with a zero length buffer, triggering a kernel panic due to a fortified strnlen() check. This occurs when the buffer length reaches zero but the loop continues, causing a BRK exception panic. The issue was found through kernel fuzz testing on a Xiaomi smartphone and fixed by adding a buffer length check before calling strnlen().

In the Linux kernel, the following vulnerability has been resolved: ALSA: control: Validate buf_len before strnlen() in snd_ctl_elem_init_enum_names() snd_ctl_elem_init_enum_names() advances pointer p through the names buffer while decrementing buf_len. If buf_len reaches zero but items remain, the next iteration calls strnlen(p, 0). While strnlen(p, 0) returns 0 and would hit the existing name_len == 0 error path, CONFIG_FORTIFY_SOURCE's fortified strnlen() first checks maxlen against __builtin_dynamic_object_size(). When Clang loses track of p's object size inside the loop, this triggers a BRK exception panic before the return value is examined. Add a buf_len == 0 guard at the loop entry to prevent calling fortified strnlen() on an exhausted buffer. Found by kernel fuzz testing through Xiaomi Smartphone.