CVE-2016-9576: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

The blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel before 4.8.14 does not properly restrict the type of iterator, which allows local users to read or write to arbitrary kernel memory locations or cause a denial of service (use-after-free) by leveraging access to a /dev/sg device.

Affected products

• Linux Linux Kernel: from 4.0, before 4.4.38 (fixed in 4.4.38); from 4.5, before 4.8.14 (fixed in 4.8.14)

Published 2016-12-28. Last modified 2026-06-17.