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.

These updated kernel packages include several security issues and numerous bug fixes, some of which you can see below. Space precludes documenting all of these bug fixes in this advisory. To see the complete list of bug fixes, users are directed to the related Knowledge Article: https://access.redhat.com/articles/3368501.

Security Fix(es) :

* Kernel: KVM: MMU potential stack buffer overrun during page walks (CVE-2017-12188, Important)

* Kernel: KVM: debug exception via syscall emulation (CVE-2017-7518, Moderate)

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.

It was discovered that the KVM subsystem in the Linux kernel did not properly keep track of nested levels in guest page tables. A local attacker in a guest VM could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code in the host OS.

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.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:0395 advisory.

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

    These updated kernel packages include several security issues and numerous     bug fixes, some of which you can see below. Space precludes documenting     all of these bug fixes in this advisory. To see the complete list of bug     fixes, users are directed to the related Knowledge Article:
    https://access.redhat.com/articles/3368501.

    Security Fix(es):

    * Kernel: KVM: MMU potential stack buffer overrun during page walks (CVE-2017-12188, Important)

    * Kernel: KVM: debug exception via syscall emulation (CVE-2017-7518, Moderate)

    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.

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.

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

  - An integer overflow vulnerability was found in the     ring_buffer_resize() calculations in which a privileged     user can adjust the size of the ringbuffer message     size. These calculations can create an issue where the     kernel memory allocator will not allocate the correct     count of pages yet expect them to be usable. This can     lead to the ftrace() output to appear to corrupt kernel     memory and possibly be used for privileged escalation     or more likely kernel panic.(CVE-2016-9754)

  - A flaw was found in the Linux kernel's implementation     of setsockopt for the SO_{SND|RCV}BUFFORCE setsockopt()     system call. Users with non-namespace CAP_NET_ADMIN are     able to trigger this call and create a situation in     which the sockets sendbuff data size could be negative.
    This could adversely affect memory allocations and     create situations where the system could crash or cause     memory corruption.(CVE-2016-9793)

  - A use-after-free vulnerability was found in ALSA pcm     layer, which allows local users to cause a denial of     service, memory corruption, or possibly other     unspecified impact. Due to the nature of the flaw,     privilege escalation cannot be fully ruled out,     although we believe it is unlikely.(CVE-2016-9794)

  - A double free vulnerability was found in netlink_dump,     which could cause a denial of service or possibly other     unspecified impact. Due to the nature of the flaw,     privilege escalation cannot be fully ruled out,     although we believe it is unlikely.(CVE-2016-9806)

  - A race condition issue leading to a use-after-free flaw     was found in the way the raw packet sockets are     implemented in the Linux kernel networking subsystem     handling synchronization. A local user able to open a     raw packet socket (requires the CAP_NET_RAW capability)     can use this issue to crash the     system.(CVE-2017-1000111)

  - An exploitable memory corruption flaw was found in the     Linux kernel. The append path can be erroneously     switched from UFO to non-UFO in ip_ufo_append_data()     when building an UFO packet with MSG_MORE option. If     unprivileged user namespaces are available, this flaw     can be exploited to gain root     privileges.(CVE-2017-1000112)

  - A stack buffer overflow flaw was found in the way the     Bluetooth subsystem of the Linux kernel processed     pending L2CAP configuration responses from a client. On     systems with the stack protection feature enabled in     the kernel (CONFIG_CC_STACKPROTECTOR=y, which is     enabled on all architectures other than s390x and     ppc64le), an unauthenticated attacker able to initiate     a connection to a system via Bluetooth could use this     flaw to crash the system. Due to the nature of the     stack protection feature, code execution cannot be     fully ruled out, although we believe it is unlikely. On     systems without the stack protection feature (ppc64le     the Bluetooth modules are not built on s390x), an     unauthenticated attacker able to initiate a connection     to a system via Bluetooth could use this flaw to     remotely execute arbitrary code on the system with ring     0 (kernel) privileges.(CVE-2017-1000251)

  - A reachable assertion failure flaw was found in the     Linux kernel built with KVM virtualisation(CONFIG_KVM)     support with Virtual Function I/O feature (CONFIG_VFIO)     enabled. This failure could occur if a malicious guest     device sent a virtual interrupt (guest IRQ) with a     larger (i1/4z1024) index value.(CVE-2017-1000252)

  - A flaw was found in the way memory was being allocated     on the stack for user space binaries. If heap (or     different memory region) and stack memory regions were     adjacent to each other, an attacker could use this flaw     to jump over the stack guard gap, cause controlled     memory corruption on process stack or the adjacent     memory region, and thus increase their privileges on     the system. This is a kernel-side mitigation which     increases the stack guard gap size from one page to 1     MiB to make successful exploitation of this issue more     difficult.(CVE-2017-1000364)

  - The Linux Kernel imposes a size restriction on the     arguments and environmental strings passed through     RLIMIT_STACK/RLIMIT_INFINITY, but does not take the     argument and environment pointers into account, which     allows attackers to bypass this     limitation.(CVE-2017-1000365)

  - The offset2lib patch as used in the Linux Kernel     contains a vulnerability that allows a PIE binary to be     execve()'ed with 1GB of arguments or environmental     strings then the stack occupies the address 0x80000000     and the PIE binary is mapped above 0x40000000     nullifying the protection of the offset2lib patch. This     affects Linux Kernel version 4.11.5 and earlier. This     is a different issue than CVE-2017-1000371. This issue     appears to be limited to i386 based     systems.(CVE-2017-1000370)

  - A flaw was found in the processing of incoming L2CAP     bluetooth commands. Uninitialized stack variables can     be sent to an attacker leaking data in kernel address     space.(CVE-2017-1000410)

  - A race condition was found in the Linux kernel before     version 4.11-rc1 in 'fs/timerfd.c' file which allows a     local user to cause a kernel list corruption or     use-after-free via simultaneous operations with a file     descriptor which leverage improper 'might_cancel'     queuing. An unprivileged local user could use this flaw     to cause a denial of service of the system. Due to the     nature of the flaw, privilege escalation cannot be     fully ruled out, although we believe it is     unlikely.(CVE-2017-10661)

  - Memory leak in the virtio_gpu_object_create function in     drivers/gpu/drm/virtio/virtgpu_object.c in the Linux     kernel through 4.11.8 allows attackers to cause a     denial of service (memory consumption) by triggering     object-initialization failures.(CVE-2017-10810)

  - The make_response function in     drivers/block/xen-blkback/blkback.c in the Linux kernel     before 4.11.8 allows guest OS users to obtain sensitive     information from host OS (or other guest OS) kernel     memory by leveraging the copying of uninitialized     padding fields in Xen block-interface response     structures, aka XSA-216.(CVE-2017-10911)

  - A use-after-free flaw was found in the Netlink     functionality of the Linux kernel networking subsystem.
    Due to the insufficient cleanup in the mq_notify     function, a local attacker could potentially use this     flaw to escalate their privileges on the     system.(CVE-2017-11176)

  - Buffer overflow in the mp_override_legacy_irq()     function in arch/x86/kernel/acpi/boot.c in the Linux     kernel through 4.12.2 allows local users to gain     privileges via a crafted ACPI table.(CVE-2017-11473)

  - The xfrm_migrate() function in the     net/xfrm/xfrm_policy.c file in the Linux kernel built     with CONFIG_XFRM_MIGRATE does not verify if the dir     parameter is less than XFRM_POLICY_MAX. This allows a     local attacker to cause a denial of service     (out-of-bounds access) or possibly have unspecified     other impact by sending a XFRM_MSG_MIGRATE netlink     message. This flaw is present in the Linux kernel since     an introduction of XFRM_MSG_MIGRATE in 2.6.21-rc1, up     to 4.13-rc3.(CVE-2017-11600)

  - A security flaw was discovered in     nl80211_set_rekey_data() function in the Linux kernel     since v3.1-rc1 through v4.13. This function does not     check whether the required attributes are present in a     netlink request. This request can be issued by a user     with CAP_NET_ADMIN privilege and may result in NULL     dereference and a system crash.(CVE-2017-12153)

  - Linux kernel built with the KVM visualization support     (CONFIG_KVM), with nested visualization (nVMX) feature     enabled (nested=1), is vulnerable to a crash due to     disabled external interrupts. As L2 guest could access     (r/w) hardware CR8 register of the host(L0). In a     nested visualization setup, L2 guest user could use     this flaw to potentially crash the host(L0) resulting     in DoS.(CVE-2017-12154)

  - The Linux kernel built with the KVM visualization     support (CONFIG_KVM), with nested visualization(nVMX)     feature enabled (nested=1), was vulnerable to a stack     buffer overflow issue. The vulnerability could occur     while traversing guest page table entries to resolve     guest virtual address(gva). An L1 guest could use this     flaw to crash the host kernel resulting in denial of     service (DoS) or potentially execute arbitrary code on     the host to gain privileges on the     system.(CVE-2017-12188)

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 Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-002569 advisory.

    arch/x86/kvm/mmu.c in the Linux kernel through 4.13.5, when nested virtualisation is used, does not     properly traverse guest pagetable entries to resolve a guest virtual address, which allows L1 guest OS     users to execute arbitrary code on the host OS or cause a denial of service (incorrect index during page     walking, and host OS crash), aka an MMU potential stack buffer overrun.

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.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-000835 advisory.

    arch/x86/kvm/mmu.c in the Linux kernel through 4.13.5, when nested virtualisation is used, does not     properly traverse guest pagetable entries to resolve a guest virtual address, which allows L1 guest OS     users to execute arbitrary code on the host OS or cause a denial of service (incorrect index during page     walking, and host OS crash), aka an MMU potential stack buffer overrun.

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.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:0412 advisory.

  - Kernel: KVM: debug exception via syscall emulation (CVE-2017-7518)

  - Kernel: KVM: MMU potential stack buffer overrun during page walks (CVE-2017-12188)

  - kernel: improper keyrings creation (CVE-2017-18270)

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

An update of the linux package has been released.

The remote NewStart CGSL host, running version MAIN 5.04, has kernel packages installed that are affected by multiple vulnerabilities:

  - A flaw was found in the Linux kernel's key management     system where it was possible for an attacker to escalate     privileges or crash the machine. If a user key gets     negatively instantiated, an error code is cached in the     payload area. A negatively instantiated key may be then     be positively instantiated by updating it with valid     data. However, the ->update key type method must be     aware that the error code may be there. (CVE-2015-8539)

  - A flaw was found in the way the Linux KVM module     processed the trap flag(TF) bit in EFLAGS during     emulation of the syscall instruction, which leads to a     debug exception(#DB) being raised in the guest stack. A     user/process inside a guest could use this flaw to     potentially escalate their privileges inside the guest.
    Linux guests are not affected by this. (CVE-2017-7518)

  - A vulnerability was found in the Key Management sub     component of the Linux kernel, where when trying to     issue a KEYTCL_READ on a negative key would lead to a     NULL pointer dereference. A local attacker could use     this flaw to crash the kernel. (CVE-2017-12192)

  - The Linux kernel built with the KVM visualization     support (CONFIG_KVM), with nested visualization(nVMX)     feature enabled (nested=1), was vulnerable to a stack     buffer overflow issue. The vulnerability could occur     while traversing guest page table entries to resolve     guest virtual address(gva). An L1 guest could use this     flaw to crash the host kernel resulting in denial of     service (DoS) or potentially execute arbitrary code on     the host to gain privileges on the system.
    (CVE-2017-12188)

  - A flaw was found in the Linux kernel's implementation of     associative arrays introduced in 3.13. This     functionality was backported to the 3.10 kernels in Red     Hat Enterprise Linux 7. The flaw involved a null pointer     dereference in assoc_array_apply_edit() due to incorrect     node-splitting in assoc_array implementation. This     affects the keyring key type and thus key addition and     link creation operations may cause the kernel to panic.
    (CVE-2017-12193)

  - It was found that fanout_add() in     'net/packet/af_packet.c' in the Linux kernel, before     version 4.13.6, allows local users to gain privileges     via crafted system calls that trigger mishandling of     packet_fanout data structures, because of a race     condition (involving fanout_add and packet_do_bind) that     leads to a use-after-free bug. (CVE-2017-15649)

  - A vulnerability was found in the Linux kernel where the     keyctl_set_reqkey_keyring() function leaks the thread     keyring. This allows an unprivileged local user to     exhaust kernel memory and thus cause a DoS.
    (CVE-2017-7472)

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

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

  - arch/x86/kvm/mmu.c in the Linux kernel through 4.13.5,     when nested virtualisation is used, does not properly     traverse guest pagetable entries to resolve a guest     virtual address, which allows L1 guest OS users to     execute arbitrary code on the host OS or cause a denial     of service (incorrect index during page walking, and     host OS crash), aka an MMU potential stack buffer     overrun.(CVE-2017-12188)

  - A vulnerability was found in the Key Management sub     component of the Linux kernel, where when trying to     issue a KEYTCL_READ on negative key would lead to a     NULL pointer dereference. A local attacker could use     this flaw to crash the kernel.(CVE-2017-12192)

  - security/keys/keyctl.c in the Linux kernel before     4.11.5 does not consider the case of a NULL payload in     conjunction with a nonzero length value, which allows     local users to cause a denial of service (NULL pointer     dereference and OOPS) via a crafted add_key or keyctl     system call, a different vulnerability than     CVE-2017-12192.(CVE-2017-15274)

  - Linux kernel: heap out-of-bounds in AF_PACKET sockets.
    This new issue is analogous to previously disclosed     CVE-2016-8655. In both cases, a socket option that     changes socket state may race with safety checks in     packet_set_ring. Previously with PACKET_VERSION. This     time with PACKET_RESERVE. The solution is similar: lock     the socket for the update. This issue may be     exploitable, we did not investigate further. As this     issue affects PF_PACKET sockets, it requires     CAP_NET_RAW in the process namespace. But note that     with user namespaces enabled, any process can create a     namespace in which it has     CAP_NET_RAW.(CVE-2017-1000111)

  - Use-after-free vulnerability in the Linux kernel before     4.14-rc5 allows local users to have unspecified impact     via vectors related to /dev/snd/seq.(CVE-2017-15265)

  - net/packet/af_packet.c in the Linux kernel before     4.13.6 allows local users to gain privileges via     crafted system calls that trigger mishandling of     packet_fanout data structures, because of a race     condition (involving fanout_add and packet_do_bind)     that leads to a use-after-free, a different     vulnerability than CVE-2017-6346.(CVE-2017-15649)

  - The sg_ioctl function in drivers/scsi/sg.c in the Linux     kernel before 4.13.4 allows local users to obtain     sensitive information from uninitialized kernel     heap-memory locations via an SG_GET_REQUEST_TABLE ioctl     call for /dev/sg0.(CVE-2017-14991)

  - An exploitable memory corruption flaw was found in the     Linux kernel. The append path can be erroneously     switched from UFO to non-UFO in ip_ufo_append_data()     when building an UFO packet with MSG_MORE option. If     unprivileged user namespaces are available, this flaw     can be exploited to gain root     privileges.(CVE-2017-1000112)

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.

ID	Name	Product	Family	Published	Updated	Severity
107271	CentOS 7 : kernel (CESA-2018:0395)	Nessus	CentOS Local Security Checks	3/12/2018	10/24/2025	high
104714	Ubuntu 17.04 : linux, linux-raspi2 vulnerability (USN-3484-1)	Nessus	Ubuntu Local Security Checks	11/21/2017	11/13/2025	high
107186	RHEL 7 : kernel (RHSA-2018:0395)	Nessus	Red Hat Local Security Checks	3/7/2018	10/24/2025	high
124821	EulerOS Virtualization 3.0.1.0 : kernel (EulerOS-SA-2019-1498)	Nessus	Huawei Local Security Checks	5/13/2019	1/6/2021	high
287702	Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-002569)	Nessus	Unity Linux Local Security Checks	1/15/2026	1/16/2026	high
290262	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-000835)	Nessus	Unity Linux Local Security Checks	1/16/2026	1/16/2026	high
107189	RHEL 7 : kernel-rt (RHSA-2018:0412)	Nessus	Red Hat Local Security Checks	3/7/2018	10/24/2025	high
121754	Photon OS 2.0: Linux PHSA-2017-0043	Nessus	PhotonOS Local Security Checks	2/7/2019	7/23/2024	high
127165	NewStart CGSL MAIN 5.04 : kernel Multiple Vulnerabilities (NS-SA-2019-0014)	Nessus	NewStart CGSL Local Security Checks	8/12/2019	5/8/2024	high
104296	EulerOS 2.0 SP1 : kernel (EulerOS-SA-2017-1271)	Nessus	Huawei Local Security Checks	11/1/2017	11/17/2025	high

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