RedHat: RHSA-2017-1297:01 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):
* It was found that the packet_set_ring() function of the Linux kernel's
networking implementation did not properly validate certain block-size
data. A local attacker with CAP_NET_RAW capability could use this flaw to
trigger a buffer overflow, resulting in the crash of the system. Due to the
nature of the flaw, privilege escalation cannot be fully ruled out.
(CVE-2017-7308, Important)
* Mounting a crafted EXT4 image read-only leads to an attacker controlled
memory corruption and SLAB-Out-of-Bounds reads. (CVE-2016-10208, Moderate)
* A flaw was found in the Linux kernel's implementation of seq_file where a
local attacker could manipulate memory in the put() function pointer. This
could lead to memory corruption and possible privileged escalation.
(CVE-2016-7910, Moderate)
* A vulnerability was found in the Linux kernel. An unprivileged local user
could trigger oops in shash_async_export() by attempting to force the
in-kernel hashing algorithms into decrypting an empty data set.
(CVE-2016-8646, Moderate)
Red Hat would like to thank Igor Redko (Virtuozzo kernel team) for
reporting CVE-2016-8646.
Bug Fix(es):
* The kernel-rt packages have been upgraded to the 3.10.0-514 source tree,
which provides a number of bug fixes over the previous version.
(BZ#1440807)
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-2016-10208 https://access.redhat.com/security/cve/CVE-2016-7910 https://access.redhat.com/security/cve/CVE-2016-8646 https://access.redhat.com/security/cve/CVE-2017-7308 https://access.redhat.com/security/updates/classification/#important
Package List
MRG Realtime for RHEL 6 Server v.2:
Source:
kernel-rt-3.10.0-514.rt56.221.el6rt.src.rpm
noarch:
kernel-rt-doc-3.10.0-514.rt56.221.el6rt.noarch.rpm
kernel-rt-firmware-3.10.0-514.rt56.221.el6rt.noarch.rpm
x86_64:
kernel-rt-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-debug-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-debug-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-trace-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-trace-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-vanilla-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-3.10.0-514.rt56.221.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
MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64
Bugs Fixed
1388821 - CVE-2016-8646 kernel: Oops in shash_async_export()
1395190 - CVE-2016-10208 kernel: EXT4 memory corruption / SLAB out-of-bounds read
1399727 - CVE-2016-7910 kernel: Use after free in seq file
1437404 - CVE-2017-7308 kernel: net/packet: overflow in check for priv area size
1440807 - update the MRG 2.5.z 3.10 kernel-rt sources