Important: kernel-rt security and bug fix update

Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.

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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• 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: nfs: use-after-free in svc_process_common() (CVE-2018-16884)
  
• kernel: nfs: NULL pointer dereference due to an anomalized NFS message sequence (CVE-2018-16871)
  
• kernel: hw: Spectre SWAPGS gadget vulnerability (CVE-2019-1125)
  

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):

• Backport TCP follow-up for small buffers [mrg-r] (BZ#1732110)
  
• update the MRG 2.5.z 3.10 realtime-kernel sources (BZ#1734469)

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

• MRG Realtime 2 x86_64

Fixes

• 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 - 1655162 - CVE-2018-16871 kernel: nfs: NULL pointer dereference due to an anomalized NFS message sequence
• BZ - 1655904 - CVE-2018-9568 kernel: Memory corruption due to incorrect socket cloning
• BZ - 1660375 - CVE-2018-16884 kernel: nfs: use-after-free in svc_process_common()
• BZ - 1724389 - CVE-2019-1125 kernel: hw: Spectre SWAPGS gadget vulnerability
• BZ - 1734469 - update the MRG 2.5.z 3.10 realtime-kernel sources

CVEs

• CVE-2018-9568
• CVE-2018-13405
• CVE-2018-16871
• CVE-2018-16884
• CVE-2019-1125

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/articles/4329821