10 - RHSA-2016:2574

Problem Description:

An update for kernel 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64 Red Hat Enterprise Linux for Containers (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64

3. Description:

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

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-2016-5412, CVE-2016-5828, 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.

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/):

1141249 - Xen guests may hang after migration or suspend/resume 1234586 - Backtrace after unclean shutdown with XFS v5 and project quotas 1267042 - XFS needs to better handle EIO and ENOSPC 1277863 - Test case failure: Screen - Resolution after no Screen Boot on Intel Valley View Gen7 [8086:0f31] 1278224 - panic in iscsi_target.c 1283341 - cannot mount RHEL7 NFS server with nfsvers=4.1,sec=krb5 but nfsvers=4.0,sec=krb5 works 1286261 - CVE-2015-8374 kernel: Information leak when truncating of compressed/inlined extents on BTRFS 1286500 - Tool thin_dump failing to show 'mappings' 1290475 - CVE-2015-8543 kernel: IPv6 connect causes DoS via NULL pointer dereference 1292481 - device mapper hung tasks on an openshift/docker system 1295802 - CVE-2015-8746 kernel: when NFSv4 migration is executed, kernel oops occurs at NFS client 1297813 - CVE-2013-4312 kernel: File descriptors passed over unix sockets are not properly accounted 1299662 - VFIO: include no-IOMMU mode - not supported 1300023 - soft lockup in nfs4_put_stid with 3.10.0-327.4.4.el7 1300237 - CVE-2016-2053 kernel: Kernel panic and system lockup by triggering BUG_ON() in public_key_verify_signature() 1301893 - CVE-2016-2069 kernel: race condition in the TLB flush logic 1302166 - MAC address of VF is not editable even when attached to host 1303532 - CVE-2015-8812 kernel: CXGB3: Logic bug in return code handling prematurely frees key structures causing Use after free or kernel panic. 1305118 - XFS support for deferred dio completion 1307091 - fstrim failing on mdadm raid 5 device 1308444 - CVE-2016-2384 kernel: double-free in usb-audio triggered by invalid USB descriptor 1308846 - CVE-2016-3070 kernel: Null pointer dereference in trace_writeback_dirty_page() 1312298 - CVE-2016-2117 kernel: Kernel memory leakage to ethernet frames due to buffer overflow in ethernet drivers 1313428 - CVE-2016-2847 kernel: pipe: limit the per-user amount of pages allocated in pipes 1318172 - CVE-2016-3156 kernel: ipv4: denial of service when destroying a network interface 1321096 - BUG: s390 socketcall() syscalls audited with wrong value in field a0 1326540 - CVE-2015-8845 CVE-2015-8844 kernel: incorrect restoration of machine specific registers from userspace 1329653 - CVE-2016-3699 kernel: ACPI table override allowed when securelevel is enabled 1333712 - CVE-2016-4581 kernel: Slave being first propagated copy causes oops in propagate_mnt 1334643 - CVE-2016-4569 kernel: Information leak in Linux sound module in timer.c 1335215 - CVE-2016-4578 kernel: Information leak in events in timer.c 1335889 - CVE-2016-4794 kernel: Use after free in array_map_alloc 1349539 - T460[p/s] audio output on dock won't work 1349916 - CVE-2016-5412 Kernel: powerpc: kvm: Infinite loop via H_CEDE hypercall when running under hypervisor-mode 1349917 - CVE-2016-5828 Kernel: powerpc: tm: crash via exec system call on PPC 1350509 - CVE-2016-5829 kernel: Heap buffer overflow in hiddev driver 1353533 - CVE-2016-6136 kernel: Race condition vulnerability in execve argv arguments 1354525 - CVE-2016-6327 kernel: infiniband: Kernel crash by sending ABORT_TASK command 1355654 - CVE-2016-6198 kernel: vfs: missing detection of hardlinks in vfs_rename() on overlayfs 1361245 - [Hyper-V][RHEL 7.2] VMs panic when configured with Dynamic Memory as opposed to Static Memory 1362466 - CVE-2016-6480 kernel: scsi: aacraid: double fetch in ioctl_send_fib() 1364971 - CVE-2016-3841 kernel: use-after-free via crafted IPV6 sendmsg for raw / tcp / udp / l2tp sockets. 1383395 - CVE-2015-8956 kernel: NULL dereference in RFCOMM bind callback