RedHat: RHSA-2018-3586:01 Important: kernel-rt security and bug fix update
Summary
The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* A flaw named FragmentSmack was found in the way the Linux kernel handled
reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use
this flaw to trigger time and calculation expensive fragment reassembly
algorithm by sending specially crafted packets which could lead to a CPU
saturation and hence a denial of service on the system. (CVE-2018-5391)
* kernel: out-of-bounds access in the show_timer function in
kernel/time/posix-timers.c (CVE-2017-18344)
* kernel: mm: use-after-free in do_get_mempolicy function allows local DoS
or other unspecified impact (CVE-2018-10675)
* kernel: Integer overflow in Linux's create_elf_tables function
(CVE-2018-14634)
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 Juha-Matti Tilli (Aalto University - Department
of Communications and Networking and Nokia Bell Labs) for reporting
CVE-2018-5391 and Qualys Research Labs for reporting CVE-2018-14634.
Bug Fix(es):
* The kernel-rt packages have been upgraded to the 3.10.0-693.43.1 source
tree, which provides a number of bug fixes over the previous version.
(BZ#1632422)
Summary
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.
References
https://access.redhat.com/security/cve/CVE-2017-18344 https://access.redhat.com/security/cve/CVE-2018-5391 https://access.redhat.com/security/cve/CVE-2018-10675 https://access.redhat.com/security/cve/CVE-2018-14634 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/articles/3553061 https://access.redhat.com/security/vulnerabilities/mutagen-astronomy
Package List
Red Hat MRG Realtime for RHEL 6 Server v.2:
Source:
kernel-rt-3.10.0-693.43.1.rt56.630.el6rt.src.rpm
noarch:
kernel-rt-doc-3.10.0-693.43.1.rt56.630.el6rt.noarch.rpm
kernel-rt-firmware-3.10.0-693.43.1.rt56.630.el6rt.noarch.rpm
x86_64:
kernel-rt-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-debug-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-devel-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-trace-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.0-693.43.1.rt56.630.el6rt.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
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 impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.
Topic
Relevant Releases Architectures
Red Hat MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64
Bugs Fixed
1575065 - CVE-2018-10675 kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact
1609664 - CVE-2018-5391 kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack)
1610958 - CVE-2017-18344 kernel: out-of-bounds access in the show_timer function in kernel/time/posix-timers.c
1624498 - CVE-2018-14634 kernel: Integer overflow in Linux's create_elf_tables function
