RHSA-2018:1854 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.

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):

• An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639, PowerPC)
• kernel: net/packet: overflow in check for priv area size (CVE-2017-7308)
• kernel: AIO interface didn't use rw_verify_area() for checking mandatory locking on files and size of access (CVE-2012-6701)
• kernel: AIO write triggers integer overflow in some protocols (CVE-2015-8830)
• kernel: Null pointer dereference via keyctl (CVE-2016-8650)
• kernel: ping socket / AF_LLC connect() sin_family race (CVE-2017-2671)
• kernel: Race condition between multiple sys_perf_event_open() calls (CVE-2017-6001)
• kernel: Incorrect error handling in the set_mempolicy and mbind compat syscalls in mm/mempolicy.c (CVE-2017-7616)
• kernel: mm subsystem does not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism (CVE-2017-7889)
• kernel: Double free in the inet_csk_clone_lock function in net/ipv4/inet_connection_sock.c (CVE-2017-8890)
• kernel: net: sctp_v6_create_accept_sk function mishandles inheritance (CVE-2017-9075)
• kernel: net: IPv6 DCCP implementation mishandles inheritance (CVE-2017-9076)
• kernel: net: tcp_v6_syn_recv_sock function mishandles inheritance (CVE-2017-9077)
• kernel: memory leak when merging buffers in SCSI IO vectors (CVE-2017-12190)
• kernel: vfs: BUG in truncate_inode_pages_range() and fuse client (CVE-2017-15121)
• kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users to cause a denial of service (CVE-2017-18203)
• kernel: a null pointer dereference in net/dccp/output.c:dccp_write_xmit() leads to a system crash (CVE-2018-1130)
• kernel: Missing length check of payload in net/sctp/sm_make_chunk.c:_sctp_make_chunk() function allows denial of service (CVE-2018-5803)

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

Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639; Vitaly Mayatskih for reporting CVE-2017-12190; and Evgenii Shatokhin (Virtuozzo Team) for reporting CVE-2018-1130. The CVE-2017-15121 issue was discovered by Miklos Szeredi (Red Hat).

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.10 Release Notes and Red Hat Enterprise Linux 6.10 Technical Notes linked from the References section.

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 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 6 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems) 6 s390x

Fixes

• BZ - 869942 - Kernel crashes on reading an ACL containing 190 ACEs over NFSv4
• BZ - 1314275 - CVE-2015-8830 kernel: AIO write triggers integer overflow in some protocols
• BZ - 1314288 - CVE-2012-6701 kernel: AIO interface didn't use rw_verify_area() for checking mandatory locking on files and size of access
• BZ - 1395187 - CVE-2016-8650 kernel: Null pointer dereference via keyctl
• BZ - 1422825 - CVE-2017-6001 kernel: Race condition between multiple sys_perf_event_open() calls
• BZ - 1436649 - CVE-2017-2671 kernel: ping socket / AF_LLC connect() sin_family race
• BZ - 1437404 - CVE-2017-7308 kernel: net/packet: overflow in check for priv area size
• BZ - 1441088 - CVE-2017-7616 kernel: Incorrect error handling in the set_mempolicy and mbind compat syscalls in mm/mempolicy.c
• BZ - 1444493 - CVE-2017-7889 kernel: mm subsystem does not properly enforce the CONFIG_STRICT_DEVMEM protection mechanism
• BZ - 1448170 - RHEL6.9: sunrpc reconnect logic now may trigger a SYN storm when a TCP connection drops and a burst of RPC commands hit the transport
• BZ - 1450972 - CVE-2017-8890 kernel: Double free in the inet_csk_clone_lock function in net/ipv4/inet_connection_sock.c
• BZ - 1452688 - CVE-2017-9076 kernel: net: IPv6 DCCP implementation mishandles inheritance
• BZ - 1452691 - CVE-2017-9075 kernel: net: sctp_v6_create_accept_sk function mishandles inheritance
• BZ - 1452744 - CVE-2017-9077 kernel: net: tcp_v6_syn_recv_sock function mishandles inheritance
• BZ - 1495089 - CVE-2017-12190 kernel: memory leak when merging buffers in SCSI IO vectors
• BZ - 1497152 - systool causes panic on 2.6.32-696.6.3.el6.x86_64 using be2iscsi
• BZ - 1520893 - CVE-2017-15121 kernel: vfs: BUG in truncate_inode_pages_range() and fuse client
• BZ - 1550811 - CVE-2017-18203 kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users to cause a denial of service
• BZ - 1551051 - CVE-2018-5803 kernel: Missing length check of payload in net/sctp/sm_make_chunk.c:_sctp_make_chunk() function allows denial of service
• BZ - 1560494 - i686: Using invpcid_flush_all_nonglobals() can cause user-space panic on .i686
• BZ - 1566890 - CVE-2018-3639 hw: cpu: speculative store bypass
• BZ - 1576419 - CVE-2018-1130 kernel: a null pointer dereference in net/dccp/output.c:dccp_write_xmit() leads to a system crash

CVEs

• CVE-2012-6701
• CVE-2015-8830
• CVE-2016-8650
• CVE-2017-2671
• CVE-2017-6001
• CVE-2017-7308
• CVE-2017-7616
• CVE-2017-7889
• CVE-2017-8890
• CVE-2017-9075
• CVE-2017-9076
• CVE-2017-9077
• CVE-2017-12190
• CVE-2017-15121
• CVE-2017-18203
• CVE-2018-1130
• CVE-2018-3639
• CVE-2018-5803

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/security/vulnerabilities/ssbd
• https://access.redhat.com/documentation/en-US/red_hat_enterprise_linux/6/html/6.10_release_notes/index.html
• https://access.redhat.com/documentation/en-US/red_hat_enterprise_linux/6/html/6.10_technical_notes/index.html