ID

VAR-201808-1002

CVE

CVE-2018-5390

TITLE

TCP implementations vulnerable to Denial of Service

DESCRIPTION

Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service. An input validation error vulnerability exists in the Linux kernel version 4.9+. Description: The RHV-M Virtual Appliance automates the process of installing and configuring the Red Hat Virtualization Manager. The appliance is available to download as an OVA file from the Customer Portal. Security Fix(es): * Modern operating systems implement virtualization of physical memory to efficiently use available system resources and provide inter-domain protection through access control and isolation. The L1TF issue was found in the way the x86 microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimisation) in combination with handling of page-faults caused by terminated virtual to physical address resolving process. As a result, an unprivileged attacker could use this flaw to read privileged memory of the kernel or other processes and/or cross guest/host boundaries to read host memory by conducting targeted cache side-channel attacks. (CVE-2018-11506) Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly initialize the crc32c checksum driver. (CVE-2018-1094) The inode_init_owner function in fs/inode.c in the Linux kernel through 4.17.4 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID. An OOPS may occur for a corrupted xfs image after xfs_da_shrink_inode() is called with a NULL bp. (CVE-2018-5390) Update instructions: The problem can be corrected by updating your livepatches to the following versions: | Kernel | Version | flavors | |--------------------------+----------+--------------------------| | 4.4.0-124.148 | 41.2 | lowlatency, generic | | 4.4.0-124.148~14.04.1 | 41.2 | generic, lowlatency | | 4.4.0-127.153 | 41.2 | lowlatency, generic | | 4.4.0-127.153~14.04.1 | 41.2 | lowlatency, generic | | 4.4.0-128.154 | 41.2 | generic, lowlatency | | 4.4.0-128.154~14.04.1 | 41.2 | generic, lowlatency | | 4.4.0-130.156 | 41.2 | generic, lowlatency | | 4.4.0-130.156~14.04.1 | 41.2 | lowlatency, generic | | 4.4.0-131.157 | 41.2 | lowlatency, generic | | 4.4.0-131.157~14.04.1 | 41.2 | lowlatency, generic | | 4.15.0-20.21 | 41.2 | generic, lowlatency | | 4.15.0-22.24 | 41.2 | lowlatency, generic | | 4.15.0-23.25 | 41.2 | lowlatency, generic | | 4.15.0-24.26 | 41.2 | lowlatency, generic | | 4.15.0-29.31 | 41.2 | generic, lowlatency | References: CVE-2018-11506, CVE-2018-1094, CVE-2018-13405, CVE-2018-13094, CVE-2018-5390 -- ubuntu-security-announce mailing list ubuntu-security-announce@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce . (BZ#1625330) 4. Description: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Bug Fix(es): * The kernel-rt packages have been upgraded to the 3.10.0-693.39.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1616431) * Previously, preemption was enabled too early after a context switch. If a task was migrated to another CPU after a context switch, a mismatch between CPU and runqueue during load balancing sometimes occurred. Consequently, a runnable task on an idle CPU failed to run, and the operating system became unresponsive. As a result, CPU migration during post-schedule processing no longer occurs, which prevents the above mismatch. (BZ#1618466) 4. ========================================================================= Ubuntu Security Notice USN-3742-2 August 14, 2018 linux-lts-trusty vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 12.04 ESM Summary: Several security issues were fixed in the Linux kernel. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 14.04 for Ubuntu 12.04 ESM. It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646) It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). (CVE-2018-3620) Andrey Konovalov discovered an out-of-bounds read in the POSIX timers subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information. A remote attacker could use this to cause a denial of service. A remote attacker could use this to cause a denial of service. (CVE-2018-5391) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 ESM: linux-image-3.13.0-155-generic 3.13.0-155.206~precise1 linux-image-3.13.0-155-generic-lpae 3.13.0-155.206~precise1 linux-image-generic-lpae-lts-trusty 3.13.0.155.145 linux-image-generic-lts-trusty 3.13.0.155.145 Please note that the recommended mitigation for CVE-2018-3646 involves updating processor microcode in addition to updating the kernel; however, the kernel includes a fallback for processors that have not received microcode updates. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2018:2776-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:2776 Issue date: 2018-09-25 CVE Names: CVE-2018-5390 ==================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 7.4 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. 7.4) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) - x86_64 Red Hat Enterprise Linux Server EUS (v. 7.4) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional EUS (v. 7.4) - ppc64, ppc64le, x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * A flaw named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A remote attacker could use this flaw to trigger time and calculation expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses. (CVE-2018-5390) Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting this issue. Bug Fix(es): * Previously, making the total buffer size bigger than the memory size for early allocation through the trace_buf_size boot option, made the system become unresponsive at the boot stage. This update introduces a change in the early memory allocation. As a result, the system no longer hangs in the above described scenario. (BZ#1588365) * When inserting objects with the same keys, made the rhlist implementation corrupt the chain pointers. As a consequence, elements were missing on removal and traversal. This patch updates the chain pointers correctly. As a result, there are no missing elements on removal and traversal in the above-described scenario. (BZ#1601008) * Previously, the kernel source code was missing support to report the Speculative Store Bypass Disable (SSBD) vulnerability status on IBM Power Systems and the little-endian variants of IBM Power Systems. As a consequence, the /sys/devices/system/cpu/vulnerabilities/spec_store_bypass file incorrectly reported "Not affected" on both CPU architectures. This fix updates the kernel source code to properly report the SSBD status either as "Vulnerable" or "Mitigation: Kernel entry/exit barrier (TYPE)" where TYPE is one of "eieio", "hwsync", "fallback", or "unknown". (BZ#1612352) * Previously, the early microcode updater in the kernel was trying to perform a microcode update on virtualized guests. As a consequence, the virtualized guests sometimes mishandled the request to perform the microcode update and became unresponsive in the early boot stage. This update applies an upstream patch to avoid the early microcode update when running under a hypervisor. As a result, no kernel freezes appear in the described scenario. (BZ#1618389) 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/): 1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack) 6. Package List: Red Hat Enterprise Linux ComputeNode EUS (v. 7.4): Source: kernel-3.10.0-693.39.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-693.39.1.el7.noarch.rpm kernel-doc-3.10.0-693.39.1.el7.noarch.rpm x86_64: kernel-3.10.0-693.39.1.el7.x86_64.rpm kernel-debug-3.10.0-693.39.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-693.39.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.39.1.el7.x86_64.rpm kernel-devel-3.10.0-693.39.1.el7.x86_64.rpm kernel-headers-3.10.0-693.39.1.el7.x86_64.rpm kernel-tools-3.10.0-693.39.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-693.39.1.el7.x86_64.rpm perf-3.10.0-693.39.1.el7.x86_64.rpm perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm python-perf-3.10.0-693.39.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4): x86_64: kernel-debug-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.39.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-693.39.1.el7.x86_64.rpm perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm Red Hat Enterprise Linux Server EUS (v. 7.4): Source: kernel-3.10.0-693.39.1.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-693.39.1.el7.noarch.rpm kernel-doc-3.10.0-693.39.1.el7.noarch.rpm ppc64: kernel-3.10.0-693.39.1.el7.ppc64.rpm kernel-bootwrapper-3.10.0-693.39.1.el7.ppc64.rpm kernel-debug-3.10.0-693.39.1.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm kernel-debug-devel-3.10.0-693.39.1.el7.ppc64.rpm kernel-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-693.39.1.el7.ppc64.rpm kernel-devel-3.10.0-693.39.1.el7.ppc64.rpm kernel-headers-3.10.0-693.39.1.el7.ppc64.rpm kernel-tools-3.10.0-693.39.1.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm kernel-tools-libs-3.10.0-693.39.1.el7.ppc64.rpm perf-3.10.0-693.39.1.el7.ppc64.rpm perf-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm python-perf-3.10.0-693.39.1.el7.ppc64.rpm python-perf-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm ppc64le: kernel-3.10.0-693.39.1.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-693.39.1.el7.ppc64le.rpm kernel-debug-3.10.0-693.39.1.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm kernel-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-693.39.1.el7.ppc64le.rpm kernel-devel-3.10.0-693.39.1.el7.ppc64le.rpm kernel-headers-3.10.0-693.39.1.el7.ppc64le.rpm kernel-tools-3.10.0-693.39.1.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm kernel-tools-libs-3.10.0-693.39.1.el7.ppc64le.rpm perf-3.10.0-693.39.1.el7.ppc64le.rpm perf-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm python-perf-3.10.0-693.39.1.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm s390x: kernel-3.10.0-693.39.1.el7.s390x.rpm kernel-debug-3.10.0-693.39.1.el7.s390x.rpm kernel-debug-debuginfo-3.10.0-693.39.1.el7.s390x.rpm kernel-debug-devel-3.10.0-693.39.1.el7.s390x.rpm kernel-debuginfo-3.10.0-693.39.1.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-693.39.1.el7.s390x.rpm kernel-devel-3.10.0-693.39.1.el7.s390x.rpm kernel-headers-3.10.0-693.39.1.el7.s390x.rpm kernel-kdump-3.10.0-693.39.1.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-693.39.1.el7.s390x.rpm kernel-kdump-devel-3.10.0-693.39.1.el7.s390x.rpm perf-3.10.0-693.39.1.el7.s390x.rpm perf-debuginfo-3.10.0-693.39.1.el7.s390x.rpm python-perf-3.10.0-693.39.1.el7.s390x.rpm python-perf-debuginfo-3.10.0-693.39.1.el7.s390x.rpm x86_64: kernel-3.10.0-693.39.1.el7.x86_64.rpm kernel-debug-3.10.0-693.39.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-693.39.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.39.1.el7.x86_64.rpm kernel-devel-3.10.0-693.39.1.el7.x86_64.rpm kernel-headers-3.10.0-693.39.1.el7.x86_64.rpm kernel-tools-3.10.0-693.39.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-693.39.1.el7.x86_64.rpm perf-3.10.0-693.39.1.el7.x86_64.rpm perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm python-perf-3.10.0-693.39.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional EUS (v. 7.4): ppc64: kernel-debug-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm kernel-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-693.39.1.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm kernel-tools-libs-devel-3.10.0-693.39.1.el7.ppc64.rpm perf-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm python-perf-debuginfo-3.10.0-693.39.1.el7.ppc64.rpm ppc64le: kernel-debug-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm kernel-debug-devel-3.10.0-693.39.1.el7.ppc64le.rpm kernel-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-693.39.1.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm kernel-tools-libs-devel-3.10.0-693.39.1.el7.ppc64le.rpm perf-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-693.39.1.el7.ppc64le.rpm x86_64: kernel-debug-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.39.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-693.39.1.el7.x86_64.rpm perf-debuginfo-3.10.0-693.39.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.39.1.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-2018-5390 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 2018 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBW6qe0NzjgjWX9erEAQifnQ//Yjt7BtzIu5kCLW7RctFFx62Ny8fJUuZ0 sLah6bMbzFmLPMvHLyrOY7W532MtFMuObhzumKzSlprP0eGYNmlz9XAxTrYD63bQ RRBHqyT0cjFYxRrtJx4S7oriE3x2jRmrcRFlmlN8Bl18XO+fieihrOH547AmXlrl eb/n0g//94pEfXiIbh9UWOqCw5jWTpk0R46Tl/i+ky4SrysGDDd1SzWP8+hnE+ps BSDZD6ubYM2T7qunnYZ0Ci7LbfMxFNtLedZvG9dO8Ywlqfif5RNNFXfXp7WvYRzb RBzcrSX+FdtY/XCn7ov3WkH32kadtx2Q7vvrA/eLdwYt+6BaGKMmU7yc+zOIsZpA 2uJUO7AYm3p9J4SW4hpxmuw3er4g+bSHGuXg8Nz6kWVyWrMzILAXQYDUDwI66rTy EZXbRaOJCFY3+vYSHKAcZRHnroSOsIq/EotegjqFN4fcSVMSNNlOeoRop7pr3kQq eWlpbaDcWiE7CA5camN4aO0doj25vIdIyT4E8B+QBP7AC5FcF94CpQkyb2htut5o 0usFXhzZSze2MxeECwIf74/1QrF+kcgcLbwBJw/k0COoJ0qLTnEOsAjMJNNR4+0N JrZ2SQAwYs/QbIGVJTGvyfVhNYnnr+EW5/nrBiZU6DokA3q6rEI/Tg4Q8OIx0wwX j4HjKybGYpU:wj -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . 6.5) - x86_64 3. Bug Fix(es): * Previously, invalid headers in the sk_buff struct led to an indefinite loop in the tcp_collapse() function. As a consequence, the system became unresponsive. (BZ#1629632) 4. 6.6) - noarch, x86_64 3. (CVE-2018-5391) * kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675) * kernel: Integer overflow in Linux's create_elf_tables function (CVE-2018-14634) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es): * After updating the system to prevent the L1 Terminal Fault (L1TF) vulnerability, only one thread was detected on systems that offer processing of two threads on a single processor core. With this update, the "__max_smt_threads()" function has been fixed. (BZ#1625334) * Previously, a kernel panic occurred when the kernel tried to make an out of bound access to the array that describes the L1 Terminal Fault (L1TF) mitigation state on systems without Extended Page Tables (EPT) support. This update extends the array of mitigation states to cover all the states, which effectively prevents out of bound array access. Also, this update enables rejecting invalid, irrelevant values, that might be erroneously provided by the userspace. (BZ#1629633) 4

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

resource management error

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Red Hat

SOURCES

LAST UPDATE DATE

2025-06-26T20:08:28.493000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE