[manjaro-security] [arch-security] [ASA-201702-18] linux-zen: multiple issues

Levente Polyak anthraxx at archlinux.org
Wed Feb 22 20:50:18 CET 2017

Arch Linux Security Advisory ASA-201702-18

Severity: High
Date    : 2017-02-22
CVE-ID  : CVE-2016-10088 CVE-2016-9588 CVE-2017-5986 CVE-2017-6074
Package : linux-zen
Type    : multiple issues
Remote  : No
Link    : https://security.archlinux.org/AVG-186


The package linux-zen before version 4.9.11-2 is vulnerable to multiple
issues including privilege escalation and denial of service.


Upgrade to 4.9.11-2.

# pacman -Syu "linux-zen>=4.9.11-2"

The problems have been fixed upstream in version 4.9.11.




- CVE-2016-10088 (privilege escalation)

The sg implementation in the Linux kernel through 4.9 does not properly
restrict write operations in situations where the KERNEL_DS option is
set, 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, related to block/bsg.c and
drivers/scsi/sg.c. NOTE: this vulnerability exists because of an
incomplete fix for CVE-2016-9576.

- CVE-2016-9588 (denial of service)

Linux kernel built with the KVM visualization support (CONFIG_KVM),
with nested visualization(nVMX) feature enabled(nested=1), is
vulnerable to an uncaught exception issue. It could occur if an L2
guest was to throw an exception which is not handled by an L1 guest.

- CVE-2017-5986 (denial of service)

It was reported that with Linux kernel, earlier than version v4.10-rc8,
an application may trigger a BUG_ON in sctp_wait_for_sndbuf if the
socket tx buffer is full, a thread is waiting on it to queue more data,
and meanwhile another thread peels off the association being used by
the first thread. This issue may then lead to a segmentation fault
resulting in denial of service.

- CVE-2017-6074 (privilege escalation)

A use-after-free vulnerability has been discovered in the DCCP
implementation in the Linux kernel. The dccp_rcv_state_process function
in net/dccp/input.c in the Linux kernel through 4.9.11 mishandles
DCCP_PKT_REQUEST packet data structures in the LISTEN state. A local
unprivileged user could use this flaw to alter the kernel memory,
allowing them to escalate their privileges on the system via an
application that makes an IPV6_RECVPKTINFO setsockopt system call.


A local unprivileged attacker is able to perform a denial of service
attack or escalate their privileges on the system.



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