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===================================================================== Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update Advisory ID: RHSA-2018:0181-01 Product: Red Hat Enterprise MRG for RHEL-6 Advisory URL: https://access.redhat.com/errata/RHSA-2018:0181 Issue date: 2018-01-25 CVE Names: CVE-2015-8539 CVE-2017-7472 CVE-2017-15649 =====================================================================
1. Summary:
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.
2. Relevant releases/architectures:
Red Hat MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64
3. 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):
* A flaw was found in the Linux kernel's key management system where it was possible for an attacker to escalate privileges or crash the machine. If a user key gets negatively instantiated, an error code is cached in the payload area. A negatively instantiated key may be then be positively instantiated by updating it with valid data. However, the ->update key type method must be aware that the error code may be there. (CVE-2015-8539, Important)
* It was found that fanout_add() in 'net/packet/af_packet.c' in the Linux kernel, before version 4.13.6, allows local users to gain privileges via crafted system calls that trigger mishandling of packet_fanout data structures, because of a race condition (involving fanout_add and packet_do_bind) that leads to a use-after-free bug. (CVE-2017-15649, Important)
* A vulnerability was found in the Linux kernel where the keyctl_set_reqkey_keyring() function leaks the thread keyring. This allows an unprivileged local user to exhaust kernel memory and thus cause a DoS. (CVE-2017-7472, Moderate)
Red Hat would like to thank Dmitry Vyukov of Google engineering for reporting CVE-2015-8539.
Bug Fix(es):
* The mlx5 driver has a number of configuration options, including the selective support for network protocols, such as InfiniBand and Ethernet. Due to a regression in the configuration of the MRG-RT kernel, the Ethernet mode of the driver was turned off. The regression has been resolved by enabling the mlx5 Ethernet mode, making the Ethernet protocol to work again. (BZ#1422778)
* The migrate_disable/enable() kernel operations are used to pin a thread to a CPU temporarily. This method is a kernel-rt specific. To keep RHEL-RT's kernel up-to-date with the latest real-time kernel, the migrate_disable/enable routine was updated to the version present on kernel v4.9-rt. However, this version showed to be problematic. The changes in the migrate_disable/enabled have been thus reverted to a stable version, avoiding the kernel BUG. (BZ#1507831)
* The kernel-rt packages have been upgraded to version 3.10.0-693.15.1.rt56.601, which provides a number of security and bug fixes over the previous version. (BZ#1519504)
4. 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.
5. Bugs fixed (https://bugzilla.redhat.com/):
1284450 - CVE-2015-8539 kernel: local privesc in key management 1422778 - [mlx5] Failed to create device for nic_driver mlx5_core 1442086 - CVE-2017-7472 kernel: keyctl_set_reqkey_keyring() leaks thread keyrings 1504574 - CVE-2017-15649 kernel: Use-after-free in the af_packet.c 1519504 - update the MRG 2.5.z 3.10 kernel-rt sources
6. Package List:
Red Hat MRG Realtime for RHEL 6 Server v.2:
Source: kernel-rt-3.10.0-693.17.1.rt56.604.el6rt.src.rpm
noarch: kernel-rt-doc-3.10.0-693.17.1.rt56.604.el6rt.noarch.rpm kernel-rt-firmware-3.10.0-693.17.1.rt56.604.el6rt.noarch.rpm
x86_64: kernel-rt-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-debug-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-debug-devel-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-debuginfo-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-devel-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-trace-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-trace-devel-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-vanilla-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-vanilla-debuginfo-3.10.0-693.17.1.rt56.604.el6rt.x86_64.rpm kernel-rt-vanilla-devel-3.10.0-693.17.1.rt56.604.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/
7. References:
https://access.redhat.com/security/cve/CVE-2015-8539 https://access.redhat.com/security/cve/CVE-2017-7472 https://access.redhat.com/security/cve/CVE-2017-15649 https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/
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