-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2017:1491-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2017:1491 Issue date: 2017-06-19 CVE Names: CVE-2017-1000364 ===================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 6.2 Advanced 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 Server AUS (v. 6.2) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 6.2) - x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * A flaw was found in the way memory was being allocated on the stack for user space binaries. If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is a kernel-side mitigation which increases the stack guard gap size from one page to 1 MiB to make successful exploitation of this issue more difficult. (CVE-2017-1000364, Important) Red Hat would like to thank Qualys Research Labs for reporting this issue. Bug Fix(es): * Previously, a kernel panic occurred when the mcelog daemon executed a huge page memory offline. This update fixes the HugeTLB feature of the Linux kernel to check for the Page Table Entry (PTE) NULL pointer in the page_check_address() function. As a result, the kernel panic no longer occurs under the described circumstances. (BZ#1444342) * Previously, the kdump mechanism was trying to get the lock by the vmalloc_sync_all() function during a kernel panic. Consequently, a deadlock occurred, and the crashkernel did not boot. This update fixes the vmalloc_sync_all() function to avoid synchronizing the vmalloc area on the crashing CPU. As a result, the crashkernel parameter now boots as expected, and the kernel dump is collected successfully under the described circumstances. (BZ#1443494) 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/): 1461333 - CVE-2017-1000364 kernel: heap/stack gap jumping via unbounded stack allocations 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.2): Source: kernel-2.6.32-220.72.2.el6.src.rpm noarch: kernel-doc-2.6.32-220.72.2.el6.noarch.rpm kernel-firmware-2.6.32-220.72.2.el6.noarch.rpm x86_64: kernel-2.6.32-220.72.2.el6.x86_64.rpm kernel-debug-2.6.32-220.72.2.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-220.72.2.el6.x86_64.rpm kernel-debug-devel-2.6.32-220.72.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-220.72.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-220.72.2.el6.x86_64.rpm kernel-devel-2.6.32-220.72.2.el6.x86_64.rpm kernel-headers-2.6.32-220.72.2.el6.x86_64.rpm perf-2.6.32-220.72.2.el6.x86_64.rpm perf-debuginfo-2.6.32-220.72.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-220.72.2.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.2): Source: kernel-2.6.32-220.72.2.el6.src.rpm x86_64: kernel-debug-debuginfo-2.6.32-220.72.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-220.72.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-220.72.2.el6.x86_64.rpm perf-debuginfo-2.6.32-220.72.2.el6.x86_64.rpm python-perf-2.6.32-220.72.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-220.72.2.el6.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-2017-1000364 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/stackguard 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 iD8DBQFZSDQvXlSAg2UNWIIRAquDAJ98Clhncx3UJzqeJ2uZCAu6OsmBhQCgoSK5 MUN12E4ERuw7VnQmuF0AxNo= =voVB -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce