Synopsis

Important: kernel security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.3 Advanced Update Support, Red Hat Enterprise Linux 7.3 Telco Extended Update Support, and Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: Out-of-bounds heap access in xfrm (CVE-2017-7184)
• kernel: Exploitable memory corruption due to UFO to non-UFO path switch (CVE-2017-1000112)
• kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c (CVE-2018-1068)
• kernel: Memory corruption due to incorrect socket cloning (CVE-2018-9568)
• kernel: Missing check in fs/inode.c:inode_init_owner() does not clear SGID bit on non-directories for non-members (CVE-2018-13405)
• kernel: Use-after-free due to race condition in AF_PACKET implementation (CVE-2018-18559)
• Kernel: page cache side channel attacks (CVE-2019-5489)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

• IPv6 UDP inconsistent usage of UFO and HW checksums (BZ#1773816)
• UDPv6 packets badly fragmented when ESP in use on devices supporting UFO (BZ#1774503)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux Server - AUS 7.3 x86_64
• Red Hat Enterprise Linux Server - TUS 7.3 x86_64
• Red Hat Enterprise Linux Server (for IBM Power LE) - Update Services for SAP Solutions 7.3 ppc64le
• Red Hat Enterprise Linux Server - Update Services for SAP Solutions 7.3 x86_64

Fixes

• BZ - 1435153 - CVE-2017-7184 kernel: Out-of-bounds heap access in xfrm
• BZ - 1479307 - CVE-2017-1000112 kernel: Exploitable memory corruption due to UFO to non-UFO path switch
• BZ - 1552048 - CVE-2018-1068 kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c
• BZ - 1599161 - CVE-2018-13405 kernel: Missing check in fs/inode.c:inode_init_owner() does not clear SGID bit on non-directories for non-members
• BZ - 1641878 - CVE-2018-18559 kernel: Use-after-free due to race condition in AF_PACKET implementation
• BZ - 1655904 - CVE-2018-9568 kernel: Memory corruption due to incorrect socket cloning
• BZ - 1664110 - CVE-2019-5489 Kernel: page cache side channel attacks

CVEs

• CVE-2017-7184
• CVE-2017-1000112
• CVE-2018-1068
• CVE-2018-9568
• CVE-2018-13405
• CVE-2018-18559
• CVE-2019-5489

References