CVE-2026-31704

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

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

setposixaclentriesdacl() and setntacldacl() 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 checkaddoverflow() at each accumulation point to detect the wrap before it corrupts the buffer, consistent with existing checkmuloverflow() usage elsewhere in smbacl.c.