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 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):

• hw: cpu: speculative execution permission faults handling (CVE-2017-5754, x86 32-bit)
  
• Kernel: error in exception handling leads to DoS (CVE-2018-8897)
  
• kernel: nfsd: Incorrect handling of long RPC replies (CVE-2017-7645)
  
• kernel: Use-after-free vulnerability in DCCP socket (CVE-2017-8824)
  
• kernel: v4l2: disabled memory access protection mechanism allowing privilege escalation (CVE-2017-13166)
  
• kernel: netfilter: use-after-free in tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c (CVE-2017-18017)
  
• kernel: Stack information leak in the EFS element (CVE-2017-1000410)
  

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 Google Project Zero for reporting CVE-2017-5754; Nick Peterson (Everdox Tech LLC) and Andy Lutomirski for reporting CVE-2018-8897; Mohamed Ghannam for reporting CVE-2017-8824; and Armis Labs for reporting CVE-2017-1000410.

Bug Fix(es):

These updated kernel packages include also numerous bug fixes. Space precludes documenting all of these bug fixes in this advisory. See the bug fix descriptions in the related Knowledge Article: https://access.redhat.com/articles/3431591

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 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

Fixes

• BZ - 1443615 - CVE-2017-7645 kernel: nfsd: Incorrect handling of long RPC replies
• BZ - 1519160 - CVE-2017-1000410 kernel: Stack information leak in the EFS element
• BZ - 1519591 - CVE-2017-8824 kernel: Use-after-free vulnerability in DCCP socket
• BZ - 1519781 - CVE-2017-5754 hw: cpu: speculative execution permission faults handling
• BZ - 1531135 - CVE-2017-18017 kernel: netfilter: use-after-free in tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c
• BZ - 1548412 - CVE-2017-13166 kernel: v4l2: disabled memory access protection mechanism allowing privilege escalation
• BZ - 1567074 - CVE-2018-8897 Kernel: error in exception handling leads to DoS

CVEs

• CVE-2017-7645
• CVE-2017-8824
• CVE-2017-13166
• CVE-2017-18017
• CVE-2017-1000410
• CVE-2018-8897

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/security/vulnerabilities/pop_ss
• https://access.redhat.com/articles/3431591
• https://access.redhat.com/security/cve/CVE-2017-5754
• https://access.redhat.com/security/vulnerabilities/speculativeexecution