The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:2395 advisory.

    The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with     extremely high determinism requirements.

    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: crypto: privilege escalation in skcipher_recvmsg function (CVE-2017-13215)

    * kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact     (CVE-2018-10675)

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

    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;
    and Juha-Matti Tilli (Aalto University, Department of Communications and Networking and Nokia Bell Labs)     for reporting CVE-2018-5390.

    Bug Fix(es):

    * The kernel-rt packages have been upgraded to the 3.10.0-862.10.2 source tree, which provides a number of     bug fixes over the previous version. (BZ#1594915)

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 7 : kernel-rt (RHSA-2018:2395)

high Nessus Plugin ID 111736

Version 1.13

Version 1.12

Version 1.11

Version 1.13 Nov 5, 2024, 12:50 PM CVSS metrics ("Cvssv4 score" set to 0.0) CVSSv2 severity (based on None, severity decreased from "High" to "Low") Detection (updated detection logic) Plugin metadata Plugin Feed: 202411051250
Version 1.12 Aug 21, 2024, 9:55 AM Exploit attributes ("Exploit available" set to "False") Exploit attributes ("Exploitability ease" set to "No known exploits are available") Plugin Feed: 202408210955
Version 1.11 Apr 28, 2024, 1:01 AM CVSS metrics ("CVSSv2 score" set to 7.2) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C") CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:U/RL:OF/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:U/RL:O/RC:C") CVSSv2 score source (set to "CVE-2018-10675") CVSSv3 score source (set to "CVE-2018-7566") Detection (updated detection logic) Plugin metadata Reference Plugin Feed: 202404280101