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 Linux 7.
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):
- 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 kernel-rt packages have been upgraded to 3.10.0-693.15.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1519506)
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
-
Red Hat Enterprise Linux for Real Time 7 x86_64
-
Red Hat Enterprise Linux for Real Time for NFV 7 x86_64
Fixes
- BZ - 1284450 - CVE-2015-8539 kernel: local privesc in key management
- BZ - 1442086 - CVE-2017-7472 kernel: keyctl_set_reqkey_keyring() leaks thread keyrings
- BZ - 1504574 - CVE-2017-15649 kernel: Use-after-free in the af_packet.c
- BZ - 1519506 - kernel-rt: update to the RHEL7.4.z batch#4 source tree
CVEs
References
Vulmon