Scientific Linux Security Update : kernel on SL7.x x86_64

High Nessus Plugin ID 93557


The remote Scientific Linux host is missing one or more security updates.


Security Fix(es) :

- A security flaw was found in the Linux kernel in the mark_source_chains() function in 'net/ipv4/netfilter/ip_tables.c'. It is possible for a user-supplied 'ipt_entry' structure to have a large 'next_offset' field. This field is not bounds checked prior to writing to a counter value at the supplied offset. (CVE-2016-3134, Important)

- A flaw was discovered in processing setsockopt for 32 bit processes on 64 bit systems. This flaw will allow attackers to alter arbitrary kernel memory when unloading a kernel module. This action is usually restricted to root-privileged users but can also be leveraged if the kernel is compiled with CONFIG_USER_NS and CONFIG_NET_NS and the user is granted elevated privileges. (CVE-2016-4997, Important)

- An out-of-bounds heap memory access leading to a Denial of Service, heap disclosure, or further impact was found in setsockopt(). The function call is normally restricted to root, however some processes with cap_sys_admin may also be able to trigger this flaw in privileged container environments. (CVE-2016-4998, Moderate)

Bug Fix(es) :

- In some cases, running the ipmitool command caused a kernel panic due to a race condition in the ipmi message handler. This update fixes the race condition, and the kernel panic no longer occurs in the described scenario.

- Previously, running I/O-intensive operations in some cases caused the system to terminate unexpectedly after a NULL pointer dereference in the kernel. With this update, a set of patches has been applied to the 3w-9xxx and 3w-sas drivers that fix this bug. As a result, the system no longer crashes in the described scenario.

- Previously, the Stream Control Transmission Protocol (SCTP) sockets did not inherit the SELinux labels properly. As a consequence, the sockets were labeled with the unlabeled_t SELinux type which caused SCTP connections to fail. The underlying source code has been modified, and SCTP connections now works as expected.

- Previously, the bnx2x driver waited for transmission completions when recovering from a parity event, which substantially increased the recovery time. With this update, bnx2x does not wait for transmission completion in the described circumstances. As a result, the recovery of bnx2x after a parity event now takes less time.

Enhancement(s) :

- With this update, the audit subsystem enables filtering of processes by name besides filtering by PID. Users can now audit by executable name (with the '-F exe=<path-to-executable>' option), which allows expression of many new audit rules. This functionality can be used to create events when specific applications perform a syscall.

- With this update, the Nonvolatile Memory Express (NVMe) and the multi- queue block layer (blk_mq) have been upgraded to the Linux 4.5 upstream version. Previously, a race condition between timeout and freeing request in blk_mq occurred, which could affect the blk_mq_tag_to_rq() function and consequently a kernel oops could occur. The provided patch fixes this race condition by updating the tags with the active request.
The patch simplifies blk_mq_tag_to_rq() and ensures that the two requests are not active at the same time.

- The Hyper-V storage driver (storvsc) has been upgraded from upstream. This update provides moderate performance improvement of I/O operations when using storvscr for certain workloads.


Update the affected packages.

See Also

Plugin Details

Severity: High

ID: 93557

File Name: sl_20160915_kernel_on_SL7_x.nasl

Version: $Revision: 2.4 $

Type: local

Agent: unix

Published: 2016/09/16

Modified: 2016/12/14

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C


Base Score: 8.4

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

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2016/09/15

Exploitable With

Metasploit (Linux Kernel 4.6.3 Netfilter Privilege Escalation)

Reference Information

CVE: CVE-2016-3134, CVE-2016-4997, CVE-2016-4998