In the Linux kernel before 5.3.4, a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c, when handling the FIB_LOOKUP_NOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753.

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - kernel: stack-based buffer overflow in chap_server_compute_md5() in iscsi target (CVE-2018-14633)

  - kernel: infinite loop in update_blocked_averages() in kernel/sched/fair.c leading to denial of service     (CVE-2018-20784)

  - The compat_get_timex function in kernel/compat.c in the Linux kernel before 4.16.9 allows local users to     obtain sensitive information from kernel memory via adjtimex. (CVE-2018-11508)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

It was discovered that the IPv6 routing implementation in the Linux kernel contained a reference counting error leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
199918	RHEL 7 : kernel-alt (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	critical
130150	Ubuntu 19.10 : Linux kernel vulnerability (USN-4161-1)	Nessus	Ubuntu Local Security Checks	high

Detections

Analytics

CVE-2019-18198

high

Tenable Plugins

critical

high