Tracker / CVE-2026-31704
CVE-2026-31704
Medium 5.5
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.
Affected products and versions
| linux | linux_kernel · 5.15 → 6.6.136 |
|---|---|
| linux | linux_kernel · 6.13 → 6.18.25 |
| linux | linux_kernel · 6.19 → 7.0.2 |
| linux | linux_kernel · 6.7 → 6.12.84 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.