CVE-2026-31704

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: use check_add_overflow() to prevent u16 DACL size overflow

set_posix_acl_entries_dacl() and set_ntacl_dacl() accumulate ACE sizes

in u16 variables. When a file has many POSIX ACL entries, the

accumulated size can wrap past 65535, causing the pointer arithmetic

(char *)pndace + *size to land within already-written ACEs. Subsequent

writes then overwrite earlier entries, and pndacl->size gets a

truncated value.

Use check_add_overflow() at each accumulation point to detect the

wrap before it corrupts the buffer, consistent with existing

check_mul_overflow() usage elsewhere in smbacl.c.