The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:0514 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):

    * kernel: Memory corruption due to incorrect socket cloning (CVE-2018-9568)

    * kernel: Unprivileged users able to inspect kernel stacks of arbitrary tasks (CVE-2018-17972)

    * kernel: Faulty computation of numberic bounds in the BPF verifier (CVE-2018-18445)

    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):

    * kernel-rt: update to the RHEL7.6.z batch#3 source tree (BZ#1672406)

    Users of kernel-rt are advised to upgrade to these updated packages, which fix this bug.

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.

Security Fix(es) :

  - kernel: Memory corruption due to incorrect socket     cloning (CVE-2018-9568)

  - kernel: Unprivileged users able to inspect kernel stacks     of arbitrary tasks (CVE-2018-17972)

  - kernel: Faulty computation of numberic bounds in the BPF     verifier (CVE-2018-18445)

Bug Fix(es) and Enhancement(s) :

  - kernel fuse invalidates cached attributes during reads

  - [NetApp-FC-NVMe] SL7.6: nvme reset gets hung     indefinitely

  - Memory reclaim deadlock calling __sock_create() after     memalloc_noio_save()

  - hardened usercopy is causing crash

  - Backport: xfrm: policy: init locks early

  - AWS m5 instance type loses NVMe mounted volumes [was:
    Unable to Mount StatefulSet PV in AWS EBS]

  - SL 7.6 running on a VirtualBox guest with a GUI has a     mouse problem

  - Kernel bug report in cgroups on heavily contested 3.10     node

  - [PCIe] SHPC probe crash on Non-ACPI/Non-SHPC ports

  - [Cavium 7.7 Feat] qla2xxx: Update to latest upstream.

  - Regression in lpfc and the CNE1000 (BE2 FCoE) adapters     that no longer initialize

  - [csiostor] call trace after command: modprobe csiostor

  - libceph: fall back to sendmsg for slab pages

  - Deadlock between stop_one_cpu_nowait() and     stop_two_cpus()

  - Soft lockups occur when the sd driver passes a device     size of 1 sector to string_get_size()

  - [SL7.7] BUG: unable to handle kernel paging request at     ffffffffffffffff

  - SL7.6 - powerpc/pseries: Disable CPU hotplug across     migrations / powerpc/rtas: Fix a potential race between     CPU-Offline &amp; Migration (LPM)

  - blk-mq: fix corruption with direct issue

  - [SL7][patch] iscsi driver can block reboot/shutdown

  - [DELL EMC 7.6 BUG] Unable to create-namespace over Dell     NVDIMM-N

  - efi_bgrt_init fails to ioremap error during boot

  - Unable to mount a share on kernel- 3.10.0-957.el7. The     share can be mounted on kernel-3.10.0-862.14.4.el7

  - System crash with RIP nfs_readpage_async+0x43 -- BUG:
    unable to handle kernel NULL pointer dereference

An update for kernel is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. 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 packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es) :

* kernel: Memory corruption due to incorrect socket cloning (CVE-2018-9568)

* kernel: Unprivileged users able to inspect kernel stacks of arbitrary tasks (CVE-2018-17972)

* kernel: Faulty computation of numberic bounds in the BPF verifier (CVE-2018-18445)

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) and Enhancement(s) :

* kernel fuse invalidates cached attributes during reads (BZ#1657921)

* [NetApp-FC-NVMe] RHEL7.6: nvme reset gets hung indefinitely (BZ#1659937)

* Memory reclaim deadlock calling __sock_create() after memalloc_noio_save() (BZ#1660392)

* hardened usercopy is causing crash (BZ#1660815)

* Backport: xfrm: policy: init locks early (BZ#1660887)

* AWS m5 instance type loses NVMe mounted volumes [was: Unable to Mount StatefulSet PV in AWS EBS] (BZ#1661947)

* RHEL 7.6 running on a VirtualBox guest with a GUI has a mouse problem (BZ# 1662848)

* Kernel bug report in cgroups on heavily contested 3.10 node (BZ#1663114)

* [PCIe] SHPC probe crash on Non-ACPI/Non-SHPC ports (BZ#1663241)

* [Cavium 7.7 Feat] qla2xxx: Update to latest upstream. (BZ#1663508)

* Regression in lpfc and the CNE1000 (BE2 FCoE) adapters that no longer initialize (BZ#1664067)

* [csiostor] call trace after command: modprobe csiostor (BZ#1665370)

* libceph: fall back to sendmsg for slab pages (BZ#1665814)

* Deadlock between stop_one_cpu_nowait() and stop_two_cpus() (BZ#1667328)

* Soft lockups occur when the sd driver passes a device size of 1 sector to string_get_size() (BZ#1667989)

* [RHEL7.7] BUG: unable to handle kernel paging request at ffffffffffffffff (BZ#1668208)

* RHEL7.6 - powerpc/pseries: Disable CPU hotplug across migrations / powerpc/ rtas: Fix a potential race between CPU-Offline & Migration (LPM) (BZ# 1669044)

* blk-mq: fix corruption with direct issue (BZ#1670511)

* [RHEL7][patch] iscsi driver can block reboot/shutdown (BZ#1670680)

* [DELL EMC 7.6 BUG] Unable to create-namespace over Dell NVDIMM-N (BZ# 1671743)

* efi_bgrt_init fails to ioremap error during boot (BZ#1671745)

* Unable to mount a share on kernel- 3.10.0-957.el7. The share can be mounted on kernel-3.10.0-862.14.4.el7 (BZ#1672448)

* System crash with RIP nfs_readpage_async+0x43 -- BUG: unable to handle kernel NULL pointer dereference (BZ#1672510)

Users of kernel are advised to upgrade to these updated packages, which fix these bugs and add this enhancement.

The linux update issued as DLA-1731-1 caused a regression in the vmxnet3 (VMware virtual network adapter) driver. This update corrects that regression, and an earlier regression in the CIFS network filesystem implementation introduced in DLA-1422-1. For reference the original advisory text follows.

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

CVE-2016-10741

A race condition was discovered in XFS that would result in a crash (BUG). A local user permitted to write to an XFS volume could use this for denial of service.

CVE-2017-5753

Further instances of code that was vulnerable to Spectre variant 1 (bounds-check bypass) have been mitigated.

CVE-2017-13305

A memory over-read was discovered in the keys subsystem's encrypted key type. A local user could use this for denial of service or possibly to read sensitive information.

CVE-2018-3639 (SSB)

Multiple researchers have discovered that Speculative Store Bypass (SSB), a feature implemented in many processors, could be used to read sensitive information from another context. In particular, code in a software sandbox may be able to read sensitive information from outside the sandbox. This issue is also known as Spectre variant 4.

This update fixes bugs in the mitigations for SSB for AMD processors.

CVE-2018-5848

The wil6210 wifi driver did not properly validate lengths in scan and connection requests, leading to a possible buffer overflow. On systems using this driver, a local user with the CAP_NET_ADMIN capability could use this for denial of service (memory corruption or crash) or potentially for privilege escalation.

CVE-2018-5953

The swiotlb subsystem printed kernel memory addresses to the system log, which could help a local attacker to exploit other vulnerabilities.

CVE-2018-12896, CVE-2018-13053

Team OWL337 reported possible integer overflows in the POSIX timer implementation. These might have some security impact.

CVE-2018-16862

Vasily Averin and Pavel Tikhomirov from Virtuozzo Kernel Team discovered that the cleancache memory management feature did not invalidate cached data for deleted files. On Xen guests using the tmem driver, local users could potentially read data from other users' deleted files if they were able to create new files on the same volume.

CVE-2018-16884

A flaw was found in the NFS 4.1 client implementation. Mounting NFS shares in multiple network namespaces at the same time could lead to a user-after-free. Local users might be able to use this for denial of service (memory corruption or crash) or possibly for privilege escalation.

This can be mitigated by disabling unprivileged users from creating user namespaces, which is the default in Debian.

CVE-2018-17972

Jann Horn reported that the /proc/*/stack files in procfs leaked sensitive data from the kernel. These files are now only readable by users with the CAP_SYS_ADMIN capability (usually only root)

CVE-2018-18281

Jann Horn reported a race condition in the virtual memory manager that can result in a process briefly having access to memory after it is freed and reallocated. A local user permitted to create containers could possibly exploit this for denial of service (memory corruption) or for privilege escalation.

CVE-2018-18690

Kanda Motohiro reported that XFS did not correctly handle some xattr (extended attribute) writes that require changing the disk format of the xattr. A user with access to an XFS volume could use this for denial of service.

CVE-2018-18710

It was discovered that the cdrom driver does not correctly validate the parameter to the CDROM_SELECT_DISC ioctl. A user with access to a cdrom device could use this to read sensitive information from the kernel or to cause a denial of service (crash).

CVE-2018-19824

Hui Peng and Mathias Payer discovered a use-after-free bug in the USB audio driver. A physically present attacker able to attach a specially designed USB device could use this for privilege escalation.

CVE-2018-19985

Hui Peng and Mathias Payer discovered a missing bounds check in the hso USB serial driver. A physically present user able to attach a specially designed USB device could use this to read sensitive information from the kernel or to cause a denial of service (crash).

CVE-2018-20169

Hui Peng and Mathias Payer discovered missing bounds checks in the USB core. A physically present attacker able to attach a specially designed USB device could use this to cause a denial of service (crash) or possibly for privilege escalation.

CVE-2018-20511

InfoSect reported an information leak in the AppleTalk IP/DDP implemntation. A local user with CAP_NET_ADMIN capability could use this to read sensitive information from the kernel.

CVE-2019-3701

Muyu Yu and Marcus Meissner reported that the CAN gateway implementation allowed the frame length to be modified, typically resulting in out-of-bounds memory-mapped I/O writes. On a system with CAN devices present, a local user with CAP_NET_ADMIN capability in the initial net namespace could use this to cause a crash (oops) or other hardware-dependent impact.

CVE-2019-3819

A potential infinite loop was discovered in the HID debugfs interface exposed under /sys/kernel/debug/hid. A user with access to these files could use this for denial of service.

This interface is only accessible to root by default, which fully mitigates the issue.

CVE-2019-6974

Jann Horn reported a use-after-free bug in KVM. A local user with access to /dev/kvm could use this to cause a denial of service (memory corruption or crash) or possibly for privilege escalation.

CVE-2019-7221

Jim Mattson and Felix Wilhelm reported a user-after-free bug in KVM's nested VMX implementation. On systems with Intel CPUs, a local user with access to /dev/kvm could use this to cause a denial of service (memory corruption or crash) or possibly for privilege escalation.

Nested VMX is disabled by default, which fully mitigates the issue.

CVE-2019-7222

Felix Wilhelm reported an information leak in KVM for x86. A local user with access to /dev/kvm could use this to read sensitive information from the kernel.

CVE-2019-9213

Jann Horn reported that privileged tasks could cause stack segments, including those in other processes, to grow downward to address 0. On systems lacking SMAP (x86) or PAN (ARM), this exacerbated other vulnerabilities: a NULL pointer dereference could be exploited for privilege escalation rather than only for denial of service.

For Debian 8 'Jessie', these problems have been fixed in version 3.16.64-1.

We recommend that you upgrade your linux packages.

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

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - A new software page cache side channel attack scenario     was discovered in operating systems that implement the     very common 'page cache' caching mechanism. A malicious     user/process could use 'in memory' page-cache knowledge     to infer access timings to shared memory and gain     knowledge which can be used to reduce effectiveness of     cryptographic strength by monitoring algorithmic     behavior, infer access patterns of memory to determine     code paths taken, and exfiltrate data to a blinded     attacker through page-granularity access times as a     side-channel.(CVE-2019-5489)

  - It was found that the Linux kernel can hit a BUG_ON()     statement in the __xfs_get_blocks() in the     fs/xfs/xfs_aops.c because of a race condition between     direct and memory-mapped I/O associated with a hole in     a file that is handled with BUG_ON() instead of an I/O     failure. This allows a local unprivileged attacker to     cause a system crash and a denial of     service.(CVE-2016-10741)

  - An issue was discovered in the proc_pid_stack function     in fs/proc/base.c in the Linux kernel. An attacker with     a local account can trick the stack unwinder code to     leak stack contents to userspace. The fix allows only     root to inspect the kernel stack of an arbitrary     task.(CVE-2018-17972)

  - A security flaw was found in the Linux kernel in a way     that the cleancache subsystem clears an inode after the     final file truncation (removal). The new file created     with the same inode may contain leftover pages from     cleancache and the old file data instead of the new     one.(CVE-2018-16862)

  - A use-after-free flaw can occur in the Linux kernel due     to a race condition between packet_do_bind() and     packet_notifier() functions called for an AF_PACKET     socket. An unprivileged, local user could use this flaw     to induce kernel memory corruption on the system,     leading to an unresponsive system or to a crash. Due to     the nature of the flaw, privilege escalation cannot be     fully ruled out.(CVE-2018-18559)

  - A flaw was found In the Linux kernel, through version     4.19.6, where a local user could exploit a     use-after-free in the ALSA driver by supplying a     malicious USB Sound device (with zero interfaces) that     is mishandled in usb_audio_probe in sound/usb/card.c.
    An attacker could corrupt memory and possibly escalate     privileges if the attacker is able to have physical     access to the system.(CVE-2018-19824)

  - A flaw was found in the Linux kernel's ext4 filesystem.
    A local user can cause a use-after-free in     ext4_xattr_set_entry function and a denial of service     or unspecified other impact may occur by renaming a     file in a crafted ext4 filesystem     image.(CVE-2018-10879)

  - A flaw was found in the Linux kernel's ext4 filesystem.
    A local user can cause an out-of-bound write in     jbd2_journal_dirty_metadata(), a denial of service, and     a system crash by mounting and operating on a crafted     ext4 filesystem image.(CVE-2018-10883)

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

The version of F5 Networks BIG-IP installed on the remote host is prior to 15.0.1.1 / 15.1.0. It is, therefore, affected by a vulnerability as referenced in the K27673650 advisory.

  - An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the Linux kernel through     4.18.11. It does not ensure that only root may inspect the kernel stack of an arbitrary task, allowing a     local attacker to exploit racy stack unwinding and leak kernel task stack contents. (CVE-2018-17972)

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-002616 advisory.

    An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the Linux kernel through     4.18.11. It does not ensure that only root may inspect the kernel stack of an arbitrary task, allowing a     local attacker to exploit racy stack unwinding and leak kernel task stack contents.

Tenable has extracted the preceding description block directly from the Unity 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.

ID	Name	Product	Family	Published	Updated	Severity
122843	RHEL 7 : kernel-rt (RHSA-2019:0514)	Nessus	Red Hat Local Security Checks	3/14/2019	11/6/2024	high
122887	Scientific Linux Security Update : kernel on SL7.x x86_64 (20190314)	Nessus	Scientific Linux Local Security Checks	3/18/2019	6/13/2024	high
122954	CentOS 7 : kernel (CESA-2019:0512)	Nessus	CentOS Local Security Checks	3/20/2019	6/13/2024	high
123420	Debian DLA-1731-2 : linux regression update (Spectre)	Nessus	Debian Local Security Checks	3/28/2019	1/9/2026	high
124430	EulerOS 2.0 SP3 : kernel (EulerOS-SA-2019-1303)	Nessus	Huawei Local Security Checks	5/1/2019	5/30/2024	high
132562	F5 Networks BIG-IP : Linux kernel vulnerability (K27673650)	Nessus	F5 Networks Local Security Checks	12/31/2019	2/28/2024	medium
287266	Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-002616)	Nessus	Unity Linux Local Security Checks	1/15/2026	1/16/2026	medium

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