The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:2390 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    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-2018-3620, CVE-2018-3646)

    * An industry-wide issue was found in the way many modern microprocessor designs have implemented     speculative execution of instructions past bounds check. The flaw relies on the presence of a precisely-     defined instruction sequence in the privileged code and the fact that memory writes occur to an address     which depends on the untrusted value. Such writes cause an update into the microprocessor's data cache     even for speculatively executed instructions that never actually commit (retire). As a result, an     unprivileged attacker could use this flaw to influence speculative execution and/or read privileged memory     by conducting targeted cache side-channel attacks. (CVE-2018-3693)

    * 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)

    * kernel: kvm: vmx: host GDT limit corruption (CVE-2018-10901)

    * kernel: Use-after-free in snd_pcm_info function in ALSA subsystem potentially leads to privilege     escalation (CVE-2017-0861)

    * kernel: Use-after-free in snd_seq_ioctl_create_port() (CVE-2017-15265)

    * kernel: race condition in snd_seq_write() may lead to UAF or OOB-access (CVE-2018-7566)

    * kernel: Race condition in sound system can lead to denial of service (CVE-2018-1000004)

    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.

    Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting CVE-2018-3620 and CVE-2018-3646;
    Vladimir Kiriansky (MIT) and Carl Waldspurger (Carl Waldspurger Consulting) for reporting CVE-2018-3693;
    Juha-Matti Tilli (Aalto University, Department of Communications and Networking and Nokia Bell Labs) for     reporting CVE-2018-5390; and Vegard Nossum (Oracle Corporation) for reporting CVE-2018-10901.

    Bug Fix(es):

    * The Least recently used (LRU) operations are batched by caching pages in per-cpu page vectors to prevent     contention of the heavily used lru_lock spinlock. The page vectors can hold even the compound pages.
    Previously, the page vectors were cleared only if they were full. Subsequently, the amount of memory held     in page vectors, which is not reclaimable, was sometimes too high. Consequently the page reclamation     started the Out of Memory (OOM) killing processes. With this update, the underlying source code has been     fixed to clear LRU page vectors each time when a compound page is added to them. As a result, OOM killing     processes due to high amounts of memory held in page vectors no longer occur. (BZ#1575819)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

Analytics

RHEL 6 : kernel (RHSA-2018:2390)

high Nessus Plugin ID 111731

Version 1.14