-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2017:1766-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2017:1766 Issue date: 2017-07-18 CVE Names: CVE-2017-7895 ===================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 7.2 Extended Update Support. 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 ComputeNode EUS (v. 7.2) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2) - x86_64 Red Hat Enterprise Linux Server EUS (v. 7.2) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 7.2) - ppc64, ppc64le, x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lacked certain checks for the end of a buffer. A remote attacker could trigger a pointer-arithmetic error or possibly cause other unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c. (CVE-2017-7895, Important) Red Hat would like to thank Ari Kauppi for reporting this issue. Bug Fix(es): * Previously, a race condition between Linux kernel module error handling and kprobe registration code existed in the Linux kernel. The protection that was applied during module error handling code could be overridden by kprobe registration code before the module was deallocated. Consequently, the mapped page could be freed and become not 'writable'. When this page was later accessed, a page fault occurred, which led to a kernel panic. This update fixes the race condition, and the kernel no longer panics due to this bug. (BZ#1454683) * Due to a race with another NFS mount, the nfs41_walk_client_list() function previously established a lease on the nfs_client pointer before the check for trunking was finished. This update ensures the processes follow the correct order and the race no longer occurs in this scenario. (BZ#1447383) * If a duplicate IPv6 address or an issue setting an address was present in the net/ipv6/addrconf.c file, a race condition occurred that could cause an IFP refcount leak. Attempts to unregister a netdevice then produced "Unregister Netdevice Failed" error messages. The provided patch fixes this bug, and race conditions no longer occur in this situation. (BZ#1449103) * Previously, subtracting from vCPU threads could cause a steal_time overflow on QEMU live migration. This update makes sure steal_time accumulation to vCPU entry time is moved before copying steal_time data to QEMU guest, thus fixing this bug. (BZ#1274919) 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/): 1446103 - CVE-2017-7895 kernel: NFSv3 server does not properly handle payload bounds checking of WRITE requests 6. Package List: Red Hat Enterprise Linux ComputeNode EUS (v. 7.2): Source: kernel-3.10.0-327.58.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.58.1.el7.noarch.rpm kernel-doc-3.10.0-327.58.1.el7.noarch.rpm x86_64: kernel-3.10.0-327.58.1.el7.x86_64.rpm kernel-debug-3.10.0-327.58.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.58.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.58.1.el7.x86_64.rpm kernel-devel-3.10.0-327.58.1.el7.x86_64.rpm kernel-headers-3.10.0-327.58.1.el7.x86_64.rpm kernel-tools-3.10.0-327.58.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.58.1.el7.x86_64.rpm perf-3.10.0-327.58.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm python-perf-3.10.0-327.58.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2): x86_64: kernel-debug-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.58.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.58.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm Red Hat Enterprise Linux Server EUS (v. 7.2): Source: kernel-3.10.0-327.58.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-327.58.1.el7.noarch.rpm kernel-doc-3.10.0-327.58.1.el7.noarch.rpm ppc64: kernel-3.10.0-327.58.1.el7.ppc64.rpm kernel-bootwrapper-3.10.0-327.58.1.el7.ppc64.rpm kernel-debug-3.10.0-327.58.1.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm kernel-debug-devel-3.10.0-327.58.1.el7.ppc64.rpm kernel-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-327.58.1.el7.ppc64.rpm kernel-devel-3.10.0-327.58.1.el7.ppc64.rpm kernel-headers-3.10.0-327.58.1.el7.ppc64.rpm kernel-tools-3.10.0-327.58.1.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm kernel-tools-libs-3.10.0-327.58.1.el7.ppc64.rpm perf-3.10.0-327.58.1.el7.ppc64.rpm perf-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm python-perf-3.10.0-327.58.1.el7.ppc64.rpm python-perf-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm ppc64le: kernel-3.10.0-327.58.1.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-327.58.1.el7.ppc64le.rpm kernel-debug-3.10.0-327.58.1.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm kernel-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-327.58.1.el7.ppc64le.rpm kernel-devel-3.10.0-327.58.1.el7.ppc64le.rpm kernel-headers-3.10.0-327.58.1.el7.ppc64le.rpm kernel-tools-3.10.0-327.58.1.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm kernel-tools-libs-3.10.0-327.58.1.el7.ppc64le.rpm perf-3.10.0-327.58.1.el7.ppc64le.rpm perf-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm python-perf-3.10.0-327.58.1.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm s390x: kernel-3.10.0-327.58.1.el7.s390x.rpm kernel-debug-3.10.0-327.58.1.el7.s390x.rpm kernel-debug-debuginfo-3.10.0-327.58.1.el7.s390x.rpm kernel-debug-devel-3.10.0-327.58.1.el7.s390x.rpm kernel-debuginfo-3.10.0-327.58.1.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-327.58.1.el7.s390x.rpm kernel-devel-3.10.0-327.58.1.el7.s390x.rpm kernel-headers-3.10.0-327.58.1.el7.s390x.rpm kernel-kdump-3.10.0-327.58.1.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-327.58.1.el7.s390x.rpm kernel-kdump-devel-3.10.0-327.58.1.el7.s390x.rpm perf-3.10.0-327.58.1.el7.s390x.rpm perf-debuginfo-3.10.0-327.58.1.el7.s390x.rpm python-perf-3.10.0-327.58.1.el7.s390x.rpm python-perf-debuginfo-3.10.0-327.58.1.el7.s390x.rpm x86_64: kernel-3.10.0-327.58.1.el7.x86_64.rpm kernel-debug-3.10.0-327.58.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-327.58.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.58.1.el7.x86_64.rpm kernel-devel-3.10.0-327.58.1.el7.x86_64.rpm kernel-headers-3.10.0-327.58.1.el7.x86_64.rpm kernel-tools-3.10.0-327.58.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-327.58.1.el7.x86_64.rpm perf-3.10.0-327.58.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm python-perf-3.10.0-327.58.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional EUS (v. 7.2): ppc64: kernel-debug-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm kernel-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-327.58.1.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm kernel-tools-libs-devel-3.10.0-327.58.1.el7.ppc64.rpm perf-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm python-perf-debuginfo-3.10.0-327.58.1.el7.ppc64.rpm ppc64le: kernel-debug-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm kernel-debug-devel-3.10.0-327.58.1.el7.ppc64le.rpm kernel-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-327.58.1.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm kernel-tools-libs-devel-3.10.0-327.58.1.el7.ppc64le.rpm perf-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-327.58.1.el7.ppc64le.rpm x86_64: kernel-debug-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-327.58.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-327.58.1.el7.x86_64.rpm perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-327.58.1.el7.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. References: https://access.redhat.com/security/cve/CVE-2017-7895 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is . More contact details at https://access.redhat.com/security/team/contact/ Copyright 2017 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFZbgajXlSAg2UNWIIRAo1QAJ9rG97XUIz7In2HjQDuGu4IRp8o9wCeJS0L NpOEganfCD0pWxGZs1k7yac= =22kx -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce