CVE-2026-31704 - ksmbd: use check_add_overflow() to prevent u16 DACL size overflow

CVE-2026-31704 - ksmbd: use check_add_overflow() to prevent u16 DACL size overflow

https://cvefeed.io/rssfeed/latest.atom / Fri, 05/01/2026 - 17:21
CVE ID :CVE-2026-31704
Published : May 1, 2026, 1:56 p.m. | 19 minutes ago
Description :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.
Severity: 0.0 | NA
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