The remote Redhat Enterprise Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2017:3322 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):

    * It was found that the timer functionality in the Linux kernel ALSA subsystem is prone to a race     condition between read and ioctl system call handlers, resulting in an uninitialized memory disclosure to     user space. A local user could use this flaw to read information belonging to other users.
    (CVE-2017-1000380, Moderate)

    Red Hat would like to thank Alexander Potapenko (Google) for reporting this issue.

    Bug Fix(es):

    * The kernel-rt packages have been upgraded to the 3.10.0-693.11.1 source tree, which provides a number of     bug fixes over the previous version. (BZ#1500035)

    * Previously, the hfi1 driver called the preempt_disable() function to prevent migration on standard Red     Hat Enterprise Linux and on Red Hat Enterprise Linux for Real Time. On Red Hat Enterprise Linux for Real     Time with the realtime kernel (kernel-rt), calling preempt_disable() triggered a kernel panic. With this     update, the kernel-rt code has been modified to use a realtime-specific function call to the     preempt_disable_nort() function, which expands to the correct calls based on the kernel that is running.
    As a result, the hfi1 driver now works correctly on both Red Hat Enterprise Linux kernel and Red Hat     Enterprise Linux for Real Time kernel-rt. (BZ#1507053)

    * Previously, the hfi1 driver called the preempt_disable() function to prevent migration on standard Red     Hat Enterprise Linux and on Red Hat Enterprise Linux for Real Time. On Red Hat Enterprise Linux for Real     Time with the realtime kernel (kernel-rt), calling preempt_disable() triggered a kernel panic. With this     update, the kernel-rt code has been modified to use a realtime-specific function call to the     preempt_disable_nort() function, which expands to the correct calls based on the kernel that is running.
    As a result, the hfi1 driver now works correctly on both Red Hat Enterprise Linux kernel and Red Hat     Enterprise Linux for Real Time kernel-rt. (BZ#1507054)

    * In the realtime kernel, if the rt_mutex locking mechanism was taken in the interrupt context, the normal     priority inheritance protocol incorrectly identified a deadlock, and a kernel panic occurred. This update     reverts the patch that added rt_mutex in the interrupt context, and the kernel no longer panics due to     this behavior. (BZ#1511382)

    Enhancement(s):

    * The current realtime throttling mechanism prevents the starvation of non-realtime tasks by CPU-intensive     realtime tasks. When a realtime run queue is throttled, it allows non-realtime tasks to run. If there are     not non-realtime tasks, the CPU goes idle. To safely maximize CPU usage by decreasing the CPU idle time,     the RT_RUNTIME_GREED scheduler feature has been implemented. When enabled, this feature checks if non-     realtime tasks are starving before throttling the realtime task. The RT_RUNTIME_GREED scheduler option     guarantees some run time on all CPUs for the non-realtime tasks, while keeping the realtime tasks running     as much as possible. (BZ#1505158)

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

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

Detections

Analytics

RHEL 7 : kernel-rt (RHSA-2017:3322)

medium Nessus Plugin ID 104950

Version 3.12

Version 3.11

Version 3.12 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 3.11 Apr 28, 2024, 3:17 AM CVSSv2 score source (set to "CVE-2017-1000380") Detection (updated detection logic) Plugin metadata Reference Plugin Feed: 202404280317