Security Bulletin: Vulnerabilities in the Linux kernel affect PowerKVM

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 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 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 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 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 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 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 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 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 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)