Synopsis

Moderate: kernel security and bug fix update

Type/Severity

Security Advisory: Moderate

Topic

Updated kernel packages that fix one security issue and several bugs are now available for Red Hat Enterprise Linux 7 Extended Update Support.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Description

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security fix:

• A flaw was discovered in the way the Linux kernel's TTY subsystem handled the tty shutdown phase. A local, unprivileged user could use this flaw to cause denial of service on the system by holding a reference to the ldisc lock during tty shutdown, causing a deadlock. (CVE-2015-4170, Moderate)

This update also fixes the following bugs:

• When Small Computer System Interface (SCSI) devices were removed or deleted, a system crash could occur due to a race condition between listing all SCSI devices and SCSI device removal. The provided patch ensures that the starting node for the klist_iter_init_node() function is actually a member of the list before using it. As a result, a system crash no longer occurs in the described scenario. (BZ#1333402)
• When creating Virtual Functions (VF) on the ixgbe driver, the Media Access Control (MAC) address for each VF could be random if not explicitly set. When generating a random MAC address, it was possible to set the address to zero. As a consequence, transmitted packets were discarded without being sent, and the user was not able to access the network. The provided patchset ensures that the VFs always end up with valid MAC addresses. As a result, packets are now transmitted as expected, and the user is able to access the network. (BZ#1335405)
• Under significant load, some applications such as logshifter could generate bursts of log messages too large for the system logger to spool. Due to a race condition, log messages from that application could then be lost even after the log volume dropped to manageable levels. This update fixes the kernel mechanism used to notify the transmitter end of the socket used by the system logger that more space is available on the receiver side, removing a race condition which previously caused the sender to stop transmitting new messages and allowing all log messages to be processed correctly. (BZ#1337602)
• When a USB serial driver was trying to acquire a line-discipline reference, a lockdep warning could occur due to the tty ldisc semaphore that was not fully initialized. With this update, a set of patches has been backported from upstream that fix this bug and no warnings occur in the aforementioned scenario. (BZ#1343554)

All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.1 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.1 s390x
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.1 ppc64
• Red Hat Enterprise Linux EUS Compute Node 7.1 x86_64
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.1 ppc64le

Fixes

• BZ - 1218879 - CVE-2015-4170 kernel: pty layer race condition on tty ldisc shutdown.

CVEs

• CVE-2015-4170

References