An update for kernel-rt is now available for Red Hat Enterprise MRG 2.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es) :
Red Hat would like to thank Alexander Potapenko (Google) for reporting this issue.
Bug Fix(es) :
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# 1459275)
The kernel-rt packages have been upgraded to version 3.10.0-693.11.1.rt56.595, which provides a number of security and bug fixes over the previous version. (BZ#1500036)
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#1509021)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2017:3295. The text
# itself is copyright (C) Red Hat, Inc.
#
include("compat.inc");
if (description)
{
script_id(104986);
script_version("3.9");
script_cvs_date("Date: 2019/10/24 15:35:44");
script_cve_id("CVE-2017-1000380");
script_xref(name:"RHSA", value:"2017:3295");
script_name(english:"RHEL 6 : MRG (RHSA-2017:3295)");
script_summary(english:"Checks the rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Red Hat host is missing one or more security updates."
);
script_set_attribute(
attribute:"description",
value:
"An update for kernel-rt is now available for Red Hat Enterprise MRG 2.
Red Hat Product Security has rated this update as having a security
impact of Moderate. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.
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 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# 1459275)
* The kernel-rt packages have been upgraded to version
3.10.0-693.11.1.rt56.595, which provides a number of security and bug
fixes over the previous version. (BZ#1500036)
* 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#1509021)"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/errata/RHSA-2017:3295"
);
script_set_attribute(
attribute:"see_also",
value:"https://access.redhat.com/security/cve/cve-2017-1000380"
);
script_set_attribute(attribute:"solution", value:"Update the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debuginfo-common-x86_64");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-doc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-firmware");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-vanilla");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-vanilla-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-vanilla-devel");
script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
script_set_attribute(attribute:"vuln_publication_date", value:"2017/06/17");
script_set_attribute(attribute:"patch_publication_date", value:"2017/11/30");
script_set_attribute(attribute:"plugin_publication_date", value:"2017/12/04");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Red Hat Local Security Checks");
script_dependencies("ssh_get_info.nasl", "linux_alt_patch_detect.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("rpm.inc");
include("ksplice.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 6.x", "Red Hat " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);
if (get_one_kb_item("Host/ksplice/kernel-cves"))
{
rm_kb_item(name:"Host/uptrack-uname-r");
cve_list = make_list("CVE-2017-1000380");
if (ksplice_cves_check(cve_list))
{
audit(AUDIT_PATCH_INSTALLED, "KSplice hotfix for RHSA-2017:3295");
}
else
{
__rpm_report = ksplice_reporting_text();
}
}
yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo))
{
rhsa = "RHSA-2017:3295";
yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
if (!empty_or_null(yum_report))
{
security_report_v4(
port : 0,
severity : SECURITY_NOTE,
extra : yum_report
);
exit(0);
}
else
{
audit_message = "affected by Red Hat security advisory " + rhsa;
audit(AUDIT_OS_NOT, audit_message);
}
}
else
{
flag = 0;
if (! (rpm_exists(release:"RHEL6", rpm:"mrg-release"))) audit(AUDIT_PACKAGE_NOT_INSTALLED, "MRG");
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-debug-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-debug-debuginfo-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-debug-devel-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-debuginfo-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-debuginfo-common-x86_64-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-devel-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", reference:"kernel-rt-doc-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", reference:"kernel-rt-firmware-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-trace-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-trace-debuginfo-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-trace-devel-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-vanilla-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-vanilla-debuginfo-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"kernel-rt-vanilla-devel-3.10.0-693.11.1.rt56.597.el6")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_NOTE,
extra : rpm_report_get() + redhat_report_package_caveat()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "kernel-rt / kernel-rt-debug / kernel-rt-debug-debuginfo / etc");
}
}
Vendor | Product | Version | CPE |
---|---|---|---|
redhat | enterprise_linux | kernel-rt | p-cpe:/a:redhat:enterprise_linux:kernel-rt |
redhat | enterprise_linux | kernel-rt-debug | p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug |
redhat | enterprise_linux | kernel-rt-debug-debuginfo | p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-debuginfo |
redhat | enterprise_linux | kernel-rt-debug-devel | p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel |
redhat | enterprise_linux | kernel-rt-debuginfo | p-cpe:/a:redhat:enterprise_linux:kernel-rt-debuginfo |
redhat | enterprise_linux | kernel-rt-debuginfo-common-x86_64 | p-cpe:/a:redhat:enterprise_linux:kernel-rt-debuginfo-common-x86_64 |
redhat | enterprise_linux | kernel-rt-devel | p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel |
redhat | enterprise_linux | kernel-rt-doc | p-cpe:/a:redhat:enterprise_linux:kernel-rt-doc |
redhat | enterprise_linux | kernel-rt-firmware | p-cpe:/a:redhat:enterprise_linux:kernel-rt-firmware |
redhat | enterprise_linux | kernel-rt-trace | p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace |