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: MIDI driver race condition leads to a double-free (CVE-2018-10902)
• kernel: net/rxrpc: overflow in decoding of krb5 principal (CVE-2017-7482)
• kernel: Missing length check of payload in net/sctp/sm_make_chunk.c:_sctp_make_chunk() function allows denial of service (CVE-2018-5803)
• kernel: use-after-free in ntfs_read_locked_inode in the ntfs.ko (CVE-2018-12929)
• kernel: stack-based out-of-bounds write in ntfs_end_buffer_async_read in the ntfs.ko (CVE-2018-12930)
• kernel: stack-based out-of-bounds write in ntfs_attr_find in the ntfs.ko (CVE-2018-12931)

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):

• Remove the NTFS module from the MRG 2.5.x realtime kernel (BZ#1674523)
• update the MRG 2.5.z 3.10 kernel-rt sources (BZ#1674935)

Users of kernel-rt are advised to upgrade to these updated packages, which fix these bugs.

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 - 1446288 - CVE-2017-7482 kernel: net/rxrpc: overflow in decoding of krb5 principal
• 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 - 1590720 - CVE-2018-10902 kernel: MIDI driver race condition leads to a double-free
• BZ - 1597831 - CVE-2018-12929 kernel: use-after-free in ntfs_read_locked_inode in the ntfs.ko
• BZ - 1597837 - CVE-2018-12930 kernel: stack-based out-of-bounds write in ntfs_end_buffer_async_read in the ntfs.ko
• BZ - 1597843 - CVE-2018-12931 kernel: stack-based out-of-bounds write in ntfs_attr_find in the ntfs.ko
• BZ - 1674935 - update the MRG 2.5.z 3.10 kernel-rt sources

CVEs

• CVE-2017-7482
• CVE-2018-5803
• CVE-2018-10902
• CVE-2018-12929
• CVE-2018-12930
• CVE-2018-12931

References