RHSA-2015:0987 - Security Advisory

Topic

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

Red Hat Product Security has rated this update as having Important security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

Description

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

• A buffer overflow flaw was found in the way the Linux kernel's Intel

AES-NI instructions optimized version of the RFC4106 GCM mode decryption
functionality handled fragmented packets. A remote attacker could use this
flaw to crash, or potentially escalate their privileges on, a system over a
connection with an active AEC-GCM mode IPSec security association.
(CVE-2015-3331, Important)

This update also fixes the following bugs:

• Previously, the kernel audit subsystem did not correctly track file path

names which could lead to empty, or "(null)" path names in the PATH audit
records. This update fixes the bug by correctly tracking file path names
and displaying the names in the audit PATH records. (BZ#1197746)

• Due to a change in the internal representation of field types,

AUDIT_LOGINUID set to -1 (4294967295) by the audit API was asymmetrically
converted to an AUDIT_LOGINUID_SET field with a value of 0, unrecognized by
an older audit API. To fix this bug, the kernel takes note about the way
the rule has been formulated and reports the rule in the originally given
form. As a result, older versions of audit provide a report as expected, in
the AUDIT_LOGINUID field type form, whereas the newer versions can migrate
to the new AUDIT_LOGINUID_SET filed type. (BZ#1197748)

• The GFS2 file system "Splice Read" operation, which is used for the

sendfile() function, was not properly allocating a required multi-block
reservation structure in memory. Consequently, when the GFS2 block
allocator was called to assign blocks of data, it attempted to dereference
the structure, which resulted in a kernel panic. With this update, "Splice
read" operation properly allocates the necessary reservation structure in
memory prior to calling the block allocator, and sendfile() thus works
properly for GFS2. (BZ#1201256)

• Moving an Open vSwitch (OVS) internal vport to a different net name space

and subsequently deleting that name space led to a kernel panic. This bug
has been fixed by removing the OVS internal vport at net name space
deletion. (BZ#1202357)

• Previously, the kernel audit subsystem was not correctly handling file

and directory moves, leading to audit records that did not match the audit
file watches. This fix correctly handles moves such that the audit file
watches work correctly. (BZ#1202358)

• Due to a regression, the crypto adapter could not be set online. A patch

has been provided that fixes the device registration process so that the
device can be used also before the registration process is completed, thus
fixing this bug. (BZ#1205300)

• Due to incorrect calculation for entropy during the entropy addition, the

amount of entropy in the /dev/random file could be overestimated.
The formula for the entropy addition has been changed, thus fixing this
bug. (BZ#1211288)

• Previously, the ansi_cprng and drbg utilities did not obey the call

convention and returned the positive value on success instead of the
correct value of zero. Consequently, Internet Protocol Security (IPsec)
terminated unexpectedly when ansi_cprng or drbg were used. With this
update, ansi_cprng and drbg have been changed to return zero on success,
and IPsec now functions correctly. (BZ#1211487)

• Due to a failure to clear the timestamp flag when reusing a tx descriptor

in the mlx4_en driver, programs that did not request a hardware timestamp
packet on their sent data received it anyway, resulting in unexpected
behavior in certain applications. With this update, when reusing the tx
descriptor in the mlx4_en driver in the aforementioned situation, the
hardware timestamp flag is cleared, and applications now behave as
expected. (BZ#1209240)

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 Server 7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.3 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 7.1 x86_64
• Red Hat Enterprise Linux Server - AUS 7.7 x86_64
• Red Hat Enterprise Linux Server - AUS 7.6 x86_64
• Red Hat Enterprise Linux Server - AUS 7.4 x86_64
• Red Hat Enterprise Linux Server - AUS 7.3 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.7 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.6 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.4 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.3 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.2 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 7.1 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.7 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.6 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.5 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.4 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.3 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.2 ppc64
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 7.1 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux Server from RHUI 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.7 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.6 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.5 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.4 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.3 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.2 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 7.1 ppc64le
• Red Hat Enterprise Linux Server - TUS 7.7 x86_64
• Red Hat Enterprise Linux Server - TUS 7.6 x86_64
• Red Hat Enterprise Linux Server - TUS 7.3 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 7 s390x
• Red Hat Enterprise Linux EUS Compute Node 7.7 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.6 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.5 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.4 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.3 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.2 x86_64
• Red Hat Enterprise Linux EUS Compute Node 7.1 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.7 ppc64le
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.6 ppc64le
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.4 ppc64le
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 7.3 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.7 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.4 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.3 x86_64
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 7.2 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian 7 ppc64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian 7 ppc64le

Fixes

• BZ - 1213322 - CVE-2015-3331 Kernel: crypto: buffer overruns in RFC4106 implementation using AESNI

CVEs

• CVE-2015-3331

References

• https://access.redhat.com/security/updates/classification/#important