Security Bulletin: Vulnerabilities in the Linux kernel affect PowerKVM

Summary

PowerKVM is affected by vulnerabilities in the Linux kernel . IBM has now addressed these vulnerabilities.

Vulnerability Details

CVEID: CVE-2017-15116 DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by NULL pointer dereference in the rngapi_reset function in crypto/rng.c. By sending a specially-crafted packet, a remote attacker could exploit this vulnerability to cause a denial of service condition.
CVSS Base Score: 5.3
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/135735&gt; 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:L)

CVEID: CVE-2017-12190 DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by an out-of-memory condition in the bio_map_user_iov and bio_unmap_user functions in block/bio.c. A local attacker could exploit this vulnerability to cause the system to crash.
CVSS Base Score: 4
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/135759&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)

CVEID: CVE-2018-10881 DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by an out-of-bound access in the ext4_get_group_info function. By mounting and operating on a specially crafted ext4 filesystem image, a local attacker could exploit this vulnerability to cause the system to crash.
CVSS Base Score: 6.2
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/147820&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2018-6412 DESCRIPTION: Linux Kernel could allow a remote attacker to obtain sensitive information, caused by an integer signedness error in the sbusfb_ioctl_helper function in drivers/video/fbdev/sbuslib.c. By using vector related to the FBIOPUTCMAP_SPARC and FBIOGETCMAP_SPARC commands, a remote attacker could exploit this vulnerability to obtain sensitive information.
CVSS Base Score: 7.5
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/138494&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)

CVEID: CVE-2018-1093 DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by an out-of-bounds read flaw in the ext4_valid_block_bitmap function in fs/ext4/balloc.c. By persuading a victim to open a specially-crafted file, a remote attacker could exploit this vulnerability to cause the system to crash.
CVSS Base Score: 5.5
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/141197&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)

CVEID: CVE-2018-1092 DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a NULL pointer dereference flaw in the ext4_iget function in fs/ext4/inode.c. By persuading a victim to open a specially-crafted file, a remote attacker could exploit this vulnerability to cause the system to crash.
CVSS Base Score: 5.5
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/141196&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)

CVEID: CVE-2018-1087 DESCRIPTION: Linux Kernel could allow a local attacker to gain elevated privileges on the system, caused by the improper handling of exceptions delivered after a stack switch operation using the MOV to SS and POP SS instructions by the KVM hypervisor. An attacker could exploit this vulnerability to gain elevated privileges or cause the guest to crash.
CVSS Base Score: 8.4
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/142976&gt; 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)

CVEID: CVE-2018-1068 DESCRIPTION: Linux Kernel could allow a local authenticated attacker to gain elevated privileges on the system, caused by an error in the implementation of 32 bit syscall interface. An attacker could exploit this vulnerability to gain root privileges on the system.
CVSS Base Score: 8.1
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/140403&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H)

CVEID: CVE-2017-16939 DESCRIPTION: Linux Kernel could allow a remote attacker to gain elevated privileges on the system, caused by an use-after-free in the Netlink socket subsystem XFRM. By sending a specially-crafted request, an attacker could exploit this vulnerability to gain privileges.
CVSS Base Score: 9.8
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/135317&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

PowerKVM 3.1

Remediation/Fixes

Customers can update PowerKVM systems by using “yum update”.

Fix images are made available via Fix Central. See <https://ibm.biz/BdHggw&gt;. This issue is addressed starting with v3.1.0.2 update 15.

Workarounds and Mitigations

none