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Security Bulletin: Multiple Vulnerabilities in the Linux kernel affect the IBM FlashSystem models V840 and V9000

Security Bulletin


There are vulnerabilities in the Linux kernel to which the IBM FlashSystem™ V840 and FlashSystem V9000 are susceptible (CVE-2017-18017 and CVE-2017-17449). An exploit of CVE-2017-18017 could allow a remote attacker to cause a denial of service condition. An exploit of CVE-2017-17449 could allow an attacker to obtain sensitive information.

Vulnerability Details

CVEID: CVE-2017-18017
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a use-after-free flaw in the tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c. By leveraging the presence of xt_TCPMSS in an iptables action, a remote attacker could exploit this vulnerability to cause a denial of service condition.
CVSS Base Score: 7.5
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2017-17449
DESCRIPTION: Linux Kernel could allow a local attacker to obtain sensitive information, caused by the failure to restrict observations of Netlink messages to a single net namespace when CONFIG_NLMON is enabled in the __netlink_deliver_tap_skb function in net/netlink/af_netlink.c. By leveraging the CAP_NET_ADMIN capability to sniff an nlmon interface for all Netlink activity on the system, an attacker could exploit this vulnerability to obtain sensitive information.
CVSS Base Score: 6.2
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)

Affected Products and Versions

Storage Node machine type and models (MTMs) affected:

  • 9846-AE1 and 9848-AE1
  • 9846-AE2 and 9848-AE2
  • 9846-AE3 and 9848-AE3

Controller Node MTMs affected:

  • 9846-AC0 and 9848-AC0
  • 9846-AC1 and 9848-AC1
  • 9846-AC2 and 9848-AC2
  • 9846-AC3 and 9848-AC3

Supported storage node code versions which are affected
  • VRMFs prior to
  • VRMFs prior to
  • VRMFs prior to

Supported controller node code versions which are affected
· VRMFs prior to
· VRMFs prior to
· VRMFs prior to



VRMF APAR Remediation/First Fix
Storage nodes:
9846-AE1, 9848-AE1, 9846-AE2, 9848-AE2, 9846-AE3, & 9848-AE3

Controller nodes: 
9846-AC0, 9846-AC1, 9848-AC0, 9848-AC1, 9846-AC2, 9848-AC2, 9846-AC3, & 9848-AC3
Code fixes are now available, the minimum VRMF containing the fix depends on the code stream: 

Fixed Code VRMF 
1.6 stream:
1.5 stream:
1.4 stream:

Controller Node VRMF 
8.2 stream:
8.1 stream:
7.8 stream:
N/A FlashSystem V840 fixes or FlashSystem V9000 fixes for storage and controller node are available @ IBM’s Fix Central

Workarounds and Mitigations

Upgrade to a remediated code level.

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Change History

28 June 2019 Original Version Published

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.


According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

Internal Use Only

Adv. 12141

Document Location


[{"Business Unit":{"code":"BU010","label":"Systems - Storage"},"Product":{"code":"ST2HTZ","label":"IBM FlashSystem V840"},"Component":"","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Versions","Edition":""},{"Business Unit":{"code":"BU010","label":"Systems - Storage"},"Product":{"code":"STKMQV","label":"IBM FlashSystem V9000"},"Component":"","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Versions","Edition":""}]

Document Information

Modified date:
11 November 2019