-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2017:1488-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2017:1488 Issue date: 2017-06-19 CVE Names: CVE-2017-1000364 CVE-2017-2636 ===================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 6.6 Advanced Update Support and Red Hat Enterprise Linux 6.6 Telco 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 Server AUS (v. 6.6) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 6.6) - x86_64 Red Hat Enterprise Linux Server Optional TUS (v. 6.6) - x86_64 Red Hat Enterprise Linux Server TUS (v. 6.6) - noarch, 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) * A race condition flaw was found in the N_HLDC Linux kernel driver when accessing n_hdlc.tbuf list that can lead to double free. A local, unprivileged user able to set the HDLC line discipline on the tty device could use this flaw to increase their privileges on the system. (CVE-2017-2636, Important) Red Hat would like to thank Qualys Research Labs for reporting CVE-2017-1000364 and Alexander Popov for reporting CVE-2017-2636. Bug Fix(es): * 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#1443497) * 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#1444349) * Previously, the vmw_pvscsi driver reported most successful aborts as FAILED due to a bug in vmw_pvscsi abort handler. This update fixes the handler, and successful aborts are no longer reported as FAILED. (BZ#1442966) 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/): 1428319 - CVE-2017-2636 kernel: Race condition access to n_hdlc.tbuf causes double free in n_hdlc_release() 1461333 - CVE-2017-1000364 kernel: heap/stack gap jumping via unbounded stack allocations 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.6): Source: kernel-2.6.32-504.60.2.el6.src.rpm noarch: kernel-abi-whitelists-2.6.32-504.60.2.el6.noarch.rpm kernel-doc-2.6.32-504.60.2.el6.noarch.rpm kernel-firmware-2.6.32-504.60.2.el6.noarch.rpm x86_64: kernel-2.6.32-504.60.2.el6.x86_64.rpm kernel-debug-2.6.32-504.60.2.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm kernel-debug-devel-2.6.32-504.60.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-504.60.2.el6.x86_64.rpm kernel-devel-2.6.32-504.60.2.el6.x86_64.rpm kernel-headers-2.6.32-504.60.2.el6.x86_64.rpm perf-2.6.32-504.60.2.el6.x86_64.rpm perf-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm Red Hat Enterprise Linux Server TUS (v. 6.6): Source: kernel-2.6.32-504.60.2.el6.src.rpm noarch: kernel-abi-whitelists-2.6.32-504.60.2.el6.noarch.rpm kernel-doc-2.6.32-504.60.2.el6.noarch.rpm kernel-firmware-2.6.32-504.60.2.el6.noarch.rpm x86_64: kernel-2.6.32-504.60.2.el6.x86_64.rpm kernel-debug-2.6.32-504.60.2.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm kernel-debug-devel-2.6.32-504.60.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-504.60.2.el6.x86_64.rpm kernel-devel-2.6.32-504.60.2.el6.x86_64.rpm kernel-headers-2.6.32-504.60.2.el6.x86_64.rpm perf-2.6.32-504.60.2.el6.x86_64.rpm perf-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.6): x86_64: kernel-debug-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-504.60.2.el6.x86_64.rpm perf-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm python-perf-2.6.32-504.60.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional TUS (v. 6.6): x86_64: kernel-debug-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-504.60.2.el6.x86_64.rpm perf-debuginfo-2.6.32-504.60.2.el6.x86_64.rpm python-perf-2.6.32-504.60.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-504.60.2.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/cve/CVE-2017-2636 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 iD8DBQFZSDUeXlSAg2UNWIIRAp2HAKC11WYTMJJJyN+CdHC0k5OE5oDCawCeM9fR Z1SJwzuB8QD0T0qp+b118N8= =UgzE -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce