The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:1489 advisory.

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

    Security Fix(es):

    * An integer overflow flaw was found in the way the Linux kernel's networking subsystem processed TCP     Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel's socket buffer     (SKB) data structure becomes fragmented. Each fragment is about TCP maximum segment size (MSS) bytes. To     efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially     overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash     the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of     TCP MSS, resulting in a denial of service (DoS). (CVE-2019-11477)

    * kernel: Double free in lib/idr.c (CVE-2019-3896)

    * Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service     (CVE-2019-11478)

    * Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of     service (CVE-2019-11479)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Bug Fix(es):

    * MDS mitigations not enabled on Intel Skylake CPUs (BZ#1713026)

    * [RHEL6] md_clear flag missing from /proc/cpuinfo (BZ#1713029)

    * RHEL6 kernel does not disable SMT with mds=full,nosmt (BZ#1713044)

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-2019:1489)

high Nessus Plugin ID 125976

Version 1.9

Version 1.8

Version 1.9 Nov 7, 2024, 2:42 AM 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 Reference Plugin Feed: 202411070242
Version 1.8 Dec 6, 2022, 1:01 AM Reference Plugin Feed: 202212060101