Security Bulletin: Vulnerability in Linux Kernel affects ProtecTIER: Dirty COW vulnerability (CVE-2016-5195)

Summary

A race condition was found in the way the Linux kernel’s memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An attacker could exploit this vulnerability to gain write access to read-only memory mappings and elevated privileges on the system.

Vulnerability Details

CVEID: CVE-2016-5195**
DESCRIPTION:** Linux Kernel could allow a local attacker to gain elevated privileges on the system, caused by a race condition when handling the copy-on-write (COW) breakage of private read-only memory mappings by the memory subsystem. An attacker could exploit this vulnerability to gain write access to read-only memory mappings and elevated privileges on the system. Note: This vulnerability is known as the Dirty COW bug.
CVSS Base Score: 8.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/118170 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:H/A:H)

Affected Products and Versions

These products affected by this vulnerability:

· ProtecTIER Enterprise Edition (PID 5639-PTA) - TS7650G

· ProtecTIER Appliance Edition (PID 5639-PTB) - TS7650AP1
· ProtecTIER Entry Edition (PID 5639-PTC) - TS7610 / TS7620
· ProtecTIER Gateway for System Z (PID 5639-FPA)

The code versions impacted are 1.2.x, 2.4.x, 2.5.x, 3.1.x, 3.2.x, 3.3.x and 3.4.x

Remediation/Fixes

<Product

| VRMF| APAR| Remediation/First Fix
—|—|—|—
ProtecTIER Enterprise Edition (PID 5639-PTA) - TS7650G| 3.3.x,

3.4.x

|
| Contact support
ProtecTIER Appliance Edition (PID 5639-PTB) - TS7650AP1| 3.3.x,|
| Contact support
ProtecTIER Entry Edition (PID 5639-PTC) | 3.3.x,

3.4.x

|
| Contact support

For releases 3.2.x, 3.1.x and below, IBM recommends upgrading to a fixed, supported version/release/platform of the product_._

Workarounds and Mitigations

None