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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2380 Important: kernel security and bug fix update 20 September 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: Red Hat Operating System: Red Hat Enterprise Linux Server 7 Impact/Access: Root Compromise -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-7533 Reference: ESB-2017.2220 Original Bulletin: https://access.redhat.com/errata/RHSA-2017:2770 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2017:2770-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2017:2770 Issue date: 2017-09-19 CVE Names: CVE-2017-7533 ===================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 7.3 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. 7.3) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3) - x86_64 Red Hat Enterprise Linux Server EUS (v. 7.3) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 7.3) - ppc64, ppc64le, x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * A race condition was found in the Linux kernel, present since v3.14-rc1 through v4.12. The race happens between threads of inotify_handle_event() and vfs_rename() while running the rename operation against the same file. As a result of the race the next slab data or the slab's free list pointer can be corrupted with attacker-controlled data, which may lead to the privilege escalation. (CVE-2017-7533, Important) Red Hat would like to thank Leilei Lin (Alibaba Group), Fan Wu (The University of Hong Kong), and Shixiong Zhao (The University of Hong Kong) for reporting this issue. Bug Fix(es): * Previously, the sha1-avx2 optimized hashing, which is used on processors supporting avx2, under certain conditions miscalculated an offset. Consequently, a kernel crash occasionally occurred on the NFS clients or servers using the krb5 security. With this update, the optimized hashing path for sha1-avx2 has been disabled, and the NFS clients and servers with krb5 security no longer experience the miscalculation and subsequent crash. (BZ#1446230) * When virt boundary limit was set, lots of small bios could not be merged even though they were contiguous physically. In some workload, such as mkfs.ntfs, system performance could be ten times degraded. The proposed patch fixes the bug by allowing to merge these small bios, which improves performance of mkfs.ntfs on devices significantly. (BZ#1472674) * When executing the mkfs.btrfs command to create a btrfs file system over Non-Volatile Memory Express (NVMe), kernel panic was previously triggered. The underlying code has been patched to fix this regression, and btrfs is now created successfully in the described scenario. (BZ#1472675) * As a side effect of BZ#147263, the system previously crashed when creating a container device. The provided patch transforms the resched_task() function into resched_curr(), and the chance of kernel crash is thus reduced in the aforementioned situation. (BZ#1473742) * Due to incorrectly used memory in VXLAN driver (a use-after-free bug and list corruption), the kernel could previously panic under some circumstances while bringing the VXLAN interfaces down. The provided patch fixes the memory corruptions, and the panic no longer occurs in this situation. (BZ#1474263) * A race condition could cause the in-flight asynchronous buffers count (bt_io_count) to become negative. This caused the umount operation to hang in the xfs_wait_buftarg() function. The provided patch fixes the buffer I/O accounting release race, and XFS umount no longer hangs. (BZ#1478253) * Kernel version 3.10.0-498.el7 separated CPU and TSC frequency and introduced the x86_platform.calibrate_cpu function pointer which points by default to the native_calibrate_cpu() function. As a consequence, time synchronization bugs appeared on Red Hat Enterprise Linux 7.3 ESXi guest causing a time offset shortly after boot. An upstream patch has been applied, which sets x86_platform.calibrate_cpu pointer on ESXi guests to the proper function, thus fixing this bug. (BZ#1479245) * A system having more than 128 CPUs could previously experience a crash during shutdown after the Intelligent Platform Management Interface (IPMI) service was stopped. The provided patch fixes a race condition in the IPMI smi_timeout() function, allowing the system to shut down as expected. (BZ#1479760) 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/): 1468283 - CVE-2017-7533 kernel: a race between inotify_handle_event() and sys_rename() 6. Package List: Red Hat Enterprise Linux ComputeNode EUS (v. 7.3): Source: kernel-3.10.0-514.32.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-514.32.2.el7.noarch.rpm kernel-doc-3.10.0-514.32.2.el7.noarch.rpm x86_64: kernel-3.10.0-514.32.2.el7.x86_64.rpm kernel-debug-3.10.0-514.32.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-514.32.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-514.32.2.el7.x86_64.rpm kernel-devel-3.10.0-514.32.2.el7.x86_64.rpm kernel-headers-3.10.0-514.32.2.el7.x86_64.rpm kernel-tools-3.10.0-514.32.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-514.32.2.el7.x86_64.rpm perf-3.10.0-514.32.2.el7.x86_64.rpm perf-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm python-perf-3.10.0-514.32.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.3): x86_64: kernel-debug-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-514.32.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-514.32.2.el7.x86_64.rpm perf-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm Red Hat Enterprise Linux Server EUS (v. 7.3): Source: kernel-3.10.0-514.32.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-514.32.2.el7.noarch.rpm kernel-doc-3.10.0-514.32.2.el7.noarch.rpm ppc64: kernel-3.10.0-514.32.2.el7.ppc64.rpm kernel-bootwrapper-3.10.0-514.32.2.el7.ppc64.rpm kernel-debug-3.10.0-514.32.2.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-514.32.2.el7.ppc64.rpm kernel-debug-devel-3.10.0-514.32.2.el7.ppc64.rpm kernel-debuginfo-3.10.0-514.32.2.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-514.32.2.el7.ppc64.rpm kernel-devel-3.10.0-514.32.2.el7.ppc64.rpm kernel-headers-3.10.0-514.32.2.el7.ppc64.rpm kernel-tools-3.10.0-514.32.2.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-514.32.2.el7.ppc64.rpm kernel-tools-libs-3.10.0-514.32.2.el7.ppc64.rpm perf-3.10.0-514.32.2.el7.ppc64.rpm perf-debuginfo-3.10.0-514.32.2.el7.ppc64.rpm python-perf-3.10.0-514.32.2.el7.ppc64.rpm python-perf-debuginfo-3.10.0-514.32.2.el7.ppc64.rpm ppc64le: kernel-3.10.0-514.32.2.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-514.32.2.el7.ppc64le.rpm kernel-debug-3.10.0-514.32.2.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-514.32.2.el7.ppc64le.rpm kernel-debuginfo-3.10.0-514.32.2.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-514.32.2.el7.ppc64le.rpm kernel-devel-3.10.0-514.32.2.el7.ppc64le.rpm kernel-headers-3.10.0-514.32.2.el7.ppc64le.rpm kernel-tools-3.10.0-514.32.2.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-514.32.2.el7.ppc64le.rpm kernel-tools-libs-3.10.0-514.32.2.el7.ppc64le.rpm perf-3.10.0-514.32.2.el7.ppc64le.rpm perf-debuginfo-3.10.0-514.32.2.el7.ppc64le.rpm python-perf-3.10.0-514.32.2.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-514.32.2.el7.ppc64le.rpm s390x: kernel-3.10.0-514.32.2.el7.s390x.rpm kernel-debug-3.10.0-514.32.2.el7.s390x.rpm kernel-debug-debuginfo-3.10.0-514.32.2.el7.s390x.rpm kernel-debug-devel-3.10.0-514.32.2.el7.s390x.rpm kernel-debuginfo-3.10.0-514.32.2.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-514.32.2.el7.s390x.rpm kernel-devel-3.10.0-514.32.2.el7.s390x.rpm kernel-headers-3.10.0-514.32.2.el7.s390x.rpm kernel-kdump-3.10.0-514.32.2.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-514.32.2.el7.s390x.rpm kernel-kdump-devel-3.10.0-514.32.2.el7.s390x.rpm perf-3.10.0-514.32.2.el7.s390x.rpm perf-debuginfo-3.10.0-514.32.2.el7.s390x.rpm python-perf-3.10.0-514.32.2.el7.s390x.rpm python-perf-debuginfo-3.10.0-514.32.2.el7.s390x.rpm x86_64: kernel-3.10.0-514.32.2.el7.x86_64.rpm kernel-debug-3.10.0-514.32.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-514.32.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-514.32.2.el7.x86_64.rpm kernel-devel-3.10.0-514.32.2.el7.x86_64.rpm kernel-headers-3.10.0-514.32.2.el7.x86_64.rpm kernel-tools-3.10.0-514.32.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-514.32.2.el7.x86_64.rpm perf-3.10.0-514.32.2.el7.x86_64.rpm perf-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm python-perf-3.10.0-514.32.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional EUS (v. 7.3): ppc64: kernel-debug-debuginfo-3.10.0-514.32.2.el7.ppc64.rpm kernel-debuginfo-3.10.0-514.32.2.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-514.32.2.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-514.32.2.el7.ppc64.rpm kernel-tools-libs-devel-3.10.0-514.32.2.el7.ppc64.rpm perf-debuginfo-3.10.0-514.32.2.el7.ppc64.rpm python-perf-debuginfo-3.10.0-514.32.2.el7.ppc64.rpm ppc64le: kernel-debug-debuginfo-3.10.0-514.32.2.el7.ppc64le.rpm kernel-debug-devel-3.10.0-514.32.2.el7.ppc64le.rpm kernel-debuginfo-3.10.0-514.32.2.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-514.32.2.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-514.32.2.el7.ppc64le.rpm kernel-tools-libs-devel-3.10.0-514.32.2.el7.ppc64le.rpm perf-debuginfo-3.10.0-514.32.2.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-514.32.2.el7.ppc64le.rpm x86_64: kernel-debug-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-514.32.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-514.32.2.el7.x86_64.rpm perf-debuginfo-3.10.0-514.32.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-514.32.2.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-2017-7533 https://access.redhat.com/security/updates/classification/#important 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2017 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFZwUFhXlSAg2UNWIIRAoUhAJ9+s5RLGbEKkGxWy2JRZXMgXUgL4QCfRP2a pIk9TMak77+0hZmQQ9qgRK8= =3CFz - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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