RHSA-2016:2584 - Security Advisory

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):

• It was found that the Linux kernel's IPv6 implementation mishandled socket options. A local attacker could abuse concurrent access to the socket options to escalate their privileges, or cause a denial of service (use-after-free and system crash) via a crafted sendmsg system call. (CVE-2016-3841, Important)
• Several Moderate and Low impact security issues were found in the Linux kernel. Space precludes documenting each of these issues in this advisory. Refer to the CVE links in the References section for a description of each of these vulnerabilities. (CVE-2013-4312, CVE-2015-8374, CVE-2015-8543, CVE-2015-8812, CVE-2015-8844, CVE-2015-8845, CVE-2016-2053, CVE-2016-2069, CVE-2016-2847, CVE-2016-3156, CVE-2016-4581, CVE-2016-4794, CVE-2016-5829, CVE-2016-6136, CVE-2016-6198, CVE-2016-6327, CVE-2016-6480, CVE-2015-8746, CVE-2015-8956, CVE-2016-2117, CVE-2016-2384, CVE-2016-3070, CVE-2016-3699, CVE-2016-4569, CVE-2016-4578)

Red Hat would like to thank Philip Pettersson (Samsung) for reporting CVE-2016-2053; Tetsuo Handa for reporting CVE-2016-2847; the Virtuozzo kernel team and Solar Designer (Openwall) for reporting CVE-2016-3156; Justin Yackoski (Cryptonite) for reporting CVE-2016-2117; and Linn Crosetto (HP) for reporting CVE-2016-3699. The CVE-2015-8812 issue was discovered by Venkatesh Pottem (Red Hat Engineering); the CVE-2015-8844 and CVE-2015-8845 issues were discovered by Miroslav Vadkerti (Red Hat Engineering); the CVE-2016-4581 issue was discovered by Eric W. Biederman (Red Hat); the CVE-2016-6198 issue was discovered by CAI Qian (Red Hat); and the CVE-2016-3070 issue was discovered by Jan Stancek (Red Hat).

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section.

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
• Red Hat Enterprise Linux for Real Time for x86_64 - Extended Life Cycle Support 7 x86_64

Fixes

• BZ - 1250750 - evaluate realtime performance implications of turning on CONFIG_CGROUP_SCHED in realtime kernel
• BZ - 1280465 - kernel-rt: update to the RHEL7.2.z batch 2 source tree
• BZ - 1280494 - [kernel-rt] update kernel-rt to match RHEL-7.3 source tree
• BZ - 1286261 - CVE-2015-8374 kernel: Information leak when truncating of compressed/inlined extents on BTRFS
• BZ - 1290475 - CVE-2015-8543 kernel: IPv6 connect causes DoS via NULL pointer dereference
• BZ - 1292902 - rt: netpoll: live lock with NAPI polling and busy polling on realtime kernel
• BZ - 1295802 - CVE-2015-8746 kernel: when NFSv4 migration is executed, kernel oops occurs at NFS client
• BZ - 1297813 - CVE-2013-4312 kernel: File descriptors passed over unix sockets are not properly accounted
• BZ - 1300237 - CVE-2016-2053 kernel: Kernel panic and system lockup by triggering BUG_ON() in public_key_verify_signature()
• BZ - 1301893 - CVE-2016-2069 kernel: race condition in the TLB flush logic
• BZ - 1303532 - CVE-2015-8812 kernel: CXGB3: Logic bug in return code handling prematurely frees key structures causing Use after free or kernel panic.
• BZ - 1303733 - backport of: "softirq: split timer softirqs out of ksoftirqd"
• BZ - 1304491 - kernel-rt: update to the RHEL7.2.z batch#3 source tree
• BZ - 1308444 - CVE-2016-2384 kernel: double-free in usb-audio triggered by invalid USB descriptor
• BZ - 1308846 - CVE-2016-3070 kernel: Null pointer dereference in trace_writeback_dirty_page()
• BZ - 1312298 - CVE-2016-2117 kernel: Kernel memory leakage to ethernet frames due to buffer overflow in ethernet drivers
• BZ - 1313428 - CVE-2016-2847 kernel: pipe: limit the per-user amount of pages allocated in pipes
• BZ - 1318172 - CVE-2016-3156 kernel: ipv4: denial of service when destroying a network interface
• BZ - 1320167 - kernel-rt: update to the RHEL7.2.z batch#4 source tree
• BZ - 1325404 - divide by zero leads to host reboot
• BZ - 1326472 - deadlock in fscache code (merge error)
• BZ - 1326540 - CVE-2015-8845 CVE-2015-8844 kernel: incorrect restoration of machine specific registers from userspace
• BZ - 1328607 - RFE: Enable can-dev module
• BZ - 1329653 - CVE-2016-3699 kernel: ACPI table override allowed when securelevel is enabled
• BZ - 1331562 - rt: fix idle_balance iterating over all CPUs if a runnable task shows up partway through
• BZ - 1332295 - kernel-rt: update to the RHEL7.2.z batch#5 source tree
• BZ - 1332593 - rt: Use IPI to trigger RT task push migration instead of pulling
• BZ - 1333712 - CVE-2016-4581 kernel: Slave being first propagated copy causes oops in propagate_mnt
• BZ - 1334643 - CVE-2016-4569 kernel: Information leak in Linux sound module in timer.c
• BZ - 1335215 - CVE-2016-4578 kernel: Information leak in events in timer.c
• BZ - 1335889 - CVE-2016-4794 kernel: Use after free in array_map_alloc
• BZ - 1337643 - softlockups correlating to "qbrXXXXXXX: hw csum failure" and failed checksumming
• BZ - 1340922 - backport of the latest "printk: Make rt aware" from PREEMPT-RT
• BZ - 1343656 - kernel-rt: update to the RHEL7.2.z batch#6 source tree
• BZ - 1344077 - turn CONFIG_RCU_NOCB_CPU_ALL=y off
• BZ - 1350509 - CVE-2016-5829 kernel: Heap buffer overflow in hiddev driver
• BZ - 1353533 - CVE-2016-6136 kernel: Race condition vulnerability in execve argv arguments
• BZ - 1354525 - CVE-2016-6327 kernel: infiniband: Kernel crash by sending ABORT_TASK command
• BZ - 1355654 - CVE-2016-6198 kernel: vfs: missing detection of hardlinks in vfs_rename() on overlayfs
• BZ - 1362466 - CVE-2016-6480 kernel: scsi: aacraid: double fetch in ioctl_send_fib()
• BZ - 1364971 - CVE-2016-3841 kernel: use-after-free via crafted IPV6 sendmsg for raw / tcp / udp / l2tp sockets.
• BZ - 1366057 - kernel-rt: update to the RHEL7.2.z batch#7 source tree
• BZ - 1383395 - CVE-2015-8956 kernel: NULL dereference in RFCOMM bind callback

CVEs

• CVE-2013-4312
• CVE-2015-8374
• CVE-2015-8543
• CVE-2015-8746
• CVE-2015-8812
• CVE-2015-8844
• CVE-2015-8845
• CVE-2015-8956
• CVE-2016-2053
• CVE-2016-2069
• CVE-2016-2117
• CVE-2016-2384
• CVE-2016-2847
• CVE-2016-3070
• CVE-2016-3156
• CVE-2016-3699
• CVE-2016-3841
• CVE-2016-4569
• CVE-2016-4578
• CVE-2016-4581
• CVE-2016-4794
• CVE-2016-5829
• CVE-2016-6136
• CVE-2016-6198
• CVE-2016-6327
• CVE-2016-6480
• CVE-2017-13167

References

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