CVE-2016-9576 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a0ac402cfcdc904f9772e1762b3fda112dcc56a0 http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00040.html http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00041.html http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00057.html http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00062.html http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00072.html http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00075.html http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00081.html http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00088.html http://lists.opensuse.org/opensuse-security-announce/2016-12/msg00091.html http://rhn.redhat.com/errata/RHSA-2017-0817.html http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.14 http://www.openwall.com/lists/oss-security/2016/12/08/19 http://www.securityfocus.com/bid/94821 https://access.redhat.com/errata/RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:2077 https://access.redhat.com/errata/RHSA-2017:2669 https://bugzilla.redhat.com/show_bug.cgi?id=1403145 https://github.com/torvalds/linux/commit/a0ac402cfcdc904f9772e1762b3fda112dcc56a0

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8