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) :

* Modern operating systems implement virtualization of physical memory to efficiently use available system resources and provide inter-domain protection through access control and isolation. The L1TF issue was found in the way the x86 microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimisation) in combination with handling of page-faults caused by terminated virtual to physical address resolving process. As a result, an unprivileged attacker could use this flaw to read privileged memory of the kernel or other processes and/or cross guest/host boundaries to read host memory by conducting targeted cache side-channel attacks.
(CVE-2018-3620, CVE-2018-3646)

* An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions past bounds check. The flaw relies on the presence of a precisely-defined instruction sequence in the privileged code and the fact that memory writes occur to an address which depends on the untrusted value. Such writes cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to influence speculative execution and/or read privileged memory by conducting targeted cache side-channel attacks.
(CVE-2018-3693)

* A flaw named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A remote attacker could use this flaw to trigger time and calculation expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses.
(CVE-2018-5390)

* kernel: crypto: privilege escalation in skcipher_recvmsg function (CVE-2017-13215)

* kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675)

* kernel: race condition in snd_seq_write() may lead to UAF or OOB access (CVE-2018-7566)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank Intel OSSIRT (Intel.com) for reporting CVE-2018-3620 and CVE-2018-3646; Vladimir Kiriansky (MIT) and Carl Waldspurger (Carl Waldspurger Consulting) for reporting CVE-2018-3693;
and Juha-Matti Tilli (Aalto University, Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5390.

Bug Fix(es) :

These updated kernel packages include also numerous bug fixes. Space precludes documenting all of the bug fixes in this advisory. See the descriptions in the related Knowledge Article :

https://access.redhat.com/articles/3527791

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:1190 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):

    * A flaw was found in the implementation of the fill buffer, a mechanism used by modern CPUs when a     cache-miss is made on L1 CPU cache. If an attacker can generate a load operation that would create a page     fault, the execution will continue speculatively with incorrect data from the fill buffer while the data     is fetched from higher level caches. This response time can be measured to infer data in the fill buffer.
    (CVE-2018-12130)

    * Modern Intel microprocessors implement hardware-level micro-optimizations to improve the performance of     writing data back to CPU caches. The write operation is split into STA (STore Address) and STD (STore     Data) sub-operations. These sub-operations allow the processor to hand-off address generation logic into     these sub-operations for optimized writes. Both of these sub-operations write to a shared distributed     processor structure called the 'processor store buffer'. As a result, an unprivileged attacker could use     this flaw to read private data resident within the CPU's processor store buffer. (CVE-2018-12126)

    * Microprocessors use a load port subcomponent to perform load operations from memory or IO. During     a load operation, the load port receives data from the memory or IO subsystem and then provides the data     to the CPU registers and operations in the CPUs pipelines. Stale load operations results are stored in     the 'load port' table until overwritten by newer operations. Certain load-port operations triggered by an     attacker can be used to reveal data about previous stale requests leaking data back to the attacker via a     timing side-channel. (CVE-2018-12127)

    * Uncacheable memory on some microprocessors utilizing speculative execution may allow an authenticated     user to potentially enable information disclosure via a side channel with local access. (CVE-2019-11091)

    * kernel: Buffer overflow in firewire driver via crafted incoming packets (CVE-2016-8633)

    * kernel: crypto: privilege escalation in skcipher_recvmsg function (CVE-2017-13215)

    * Kernel: ipsec: xfrm: use-after-free leading to potential privilege escalation (CVE-2017-16939)

    * kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c     (CVE-2018-1068)

    * kernel: Use-after-free due to race condition in AF_PACKET implementation (CVE-2018-18559)

    * kernel: media: use-after-free in [tuner-xc2028] media driver (CVE-2016-7913)

    * kernel: Out-of-bounds access via an XFRM_MSG_MIGRATE xfrm Netlink message (CVE-2017-11600)

    * kernel: memory leak when merging buffers in SCSI IO vectors (CVE-2017-12190)

    * kernel: Unallocated memory access by malicious USB device via bNumInterfaces overflow (CVE-2017-17558)

    * Kernel: FPU state information leakage via lazy FPU restore (CVE-2018-3665)

    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):

    * update the MRG 2.5.z 3.10 kernel-rt sources (BZ#1692711)

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.

The SUSE Linux Enterprise 11 SP4 kernel was updated to receive various security and bugfixes. The following security bugs were fixed :

  - CVE-2017-5715: Systems with microprocessors utilizing     speculative execution and indirect branch prediction may     allow unauthorized disclosure of information to an     attacker with local user access via a side-channel     analysis (bnc#1068032). The previous fix using CPU     Microcode has been complemented by building the Linux     Kernel with return trampolines aka 'retpolines'.

  - CVE-2018-5332: In the Linux kernel the     rds_message_alloc_sgs() function did not validate a     value that is used during DMA page allocation, leading     to a heap-based out-of-bounds write (related to the     rds_rdma_extra_size function in net/rds/rdma.c)     (bnc#1075621).

  - CVE-2018-5333: In the Linux kernel the rds_cmsg_atomic     function in net/rds/rdma.c mishandled cases where page     pinning fails or an invalid address is supplied, leading     to an rds_atomic_free_op NULL pointer dereference     (bnc#1075617).

  - CVE-2017-18017: The tcpmss_mangle_packet function in     net/netfilter/xt_TCPMSS.c in the Linux kernel allowed     remote attackers to cause a denial of service     (use-after-free and memory corruption) or possibly have     unspecified other impact by leveraging the presence of     xt_TCPMSS in an iptables action (bnc#1074488).

  - CVE-2017-18079: drivers/input/serio/i8042.c in the Linux     kernel allowed attackers to cause a denial of service     (NULL pointer dereference and system crash) or possibly     have unspecified other impact because the port->exists     value can change after it is validated (bnc#1077922).

  - CVE-2015-1142857: On multiple SR-IOV cars it is possible     for VF's assigned to guests to send ethernet flow     control pause frames via the PF. (bnc#1077355).

  - CVE-2017-17741: The KVM implementation in the Linux     kernel allowed attackers to obtain potentially sensitive     information from kernel memory, aka a write_mmio     stack-based out-of-bounds read, related to     arch/x86/kvm/x86.c and include/trace/events/kvm.h     (bnc#1073311).

  - CVE-2017-13215: A elevation of privilege vulnerability     in the Upstream kernel skcipher. (bnc#1075908).

  - CVE-2018-1000004: In the Linux kernel a race condition     vulnerability existed in the sound system, this can lead     to a deadlock and denial of service condition     (bnc#1076017).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE 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 Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - An industry-wide issue was found in the way many modern     microprocessor designs have implemented speculative     execution of instructions past bounds check. The flaw     relies on the presence of a precisely-defined     instruction sequence in the privileged code and the     fact that memory writes occur to an address which     depends on the untrusted value. Such writes cause an     update into the microprocessor's data cache even for     speculatively executed instructions that never actually     commit (retire). As a result, an unprivileged attacker     could use this flaw to influence speculative execution     and/or read privileged memory by conducting targeted     cache side-channel attacks.(CVE-2018-3693)

  - A flaw named SegmentSmack was found in the way the     Linux kernel handled specially crafted TCP packets. A     remote attacker could use this flaw to trigger time and     calculation expensive calls to tcp_collapse_ofo_queue()     and tcp_prune_ofo_queue() functions by sending     specially modified packets within ongoing TCP sessions     which could lead to a CPU saturation and hence a denial     of service on the system. Maintaining the denial of     service condition requires continuous two-way TCP     sessions to a reachable open port, thus the attacks     cannot be performed using spoofed IP     addresses.(CVE-2018-5390)

  - It was found that the raw midi kernel driver does not     protect against concurrent access which leads to a     double realloc (double free) in     snd_rawmidi_input_params() and     snd_rawmidi_output_status() which are part of     snd_rawmidi_ioctl() handler in rawmidi.c file. A     malicious local attacker could possibly use this for     privilege escalation.(CVE-2018-10902)

  - Integer overflow in the aio_setup_single_vector     function in fs/aio.c in the Linux kernel 4.0 allows     local users to cause a denial of service or possibly     have unspecified other impact via a large AIO iovec.
    NOTE: this vulnerability exists because of a     CVE-2012-6701 regression.(CVE-2015-8830)

  - A flaw was found in the Linux networking subsystem     where a local attacker with CAP_NET_ADMIN capabilities     could cause an out-of-bounds memory access by creating     a smaller-than-expected ICMP header and sending to its     destination via sendto().(CVE-2016-8399)

  - Out-of-bounds kernel heap access vulnerability was     found in xfrm, kernel's IP framework for transforming     packets. An error dealing with netlink messages from an     unprivileged user leads to arbitrary read/write and     privilege escalation.(CVE-2017-7184)

  - The Linux kernel was found to be vulnerable to a NULL     pointer dereference bug in the __netlink_ns_capable()     function in the net/netlink/af_netlink.c file. A local     attacker could exploit this when a net namespace with a     netnsid is assigned to cause a kernel panic and a     denial of service.i1/4^CVE-2018-14646i1/4%0

  - A flaw was found where the kernel truncated the value     used to indicate the size of a buffer which it would     later become zero using an untruncated value. This can     corrupt memory outside of the original     allocation.(CVE-2017-9725)

  - A bug in the 32-bit compatibility layer of the ioctl     handling code of the v4l2 video driver in the Linux     kernel has been found. A memory protection mechanism     ensuring that user-provided buffers always point to a     userspace memory were disabled, allowing destination     address to be in a kernel space. This flaw could be     exploited by an attacker to overwrite a kernel memory     from an unprivileged userspace process, leading to     privilege escalation.(CVE-2017-13166)

  - An industry-wide issue was found in the way many modern     microprocessor designs have implemented speculative     execution of instructions (a commonly used performance     optimization). There are three primary variants of the     issue which differ in the way the speculative execution     can be exploited. Variant CVE-2017-5754 relies on the     fact that, on impacted microprocessors, during     speculative execution of instruction permission faults,     exception generation triggered by a faulting access is     suppressed until the retirement of the whole     instruction block. In a combination with the fact that     memory accesses may populate the cache even when the     block is being dropped and never committed (executed),     an unprivileged local attacker could use this flaw to     read privileged (kernel space) memory by conducting     targeted cache side-channel attacks. Note:
    CVE-2017-5754 affects Intel x86-64 microprocessors. AMD     x86-64 microprocessors are not affected by this     issue.(CVE-2017-5754)

  - An industry-wide issue was found in the way many modern     microprocessor designs have implemented speculative     execution of instructions (a commonly used performance     optimization). There are three primary variants of the     issue which differ in the way the speculative execution     can be exploited. Variant CVE-2017-5753 triggers the     speculative execution by performing a bounds-check     bypass. It relies on the presence of a     precisely-defined instruction sequence in the     privileged code as well as the fact that memory     accesses may cause allocation into the microprocessor's     data cache even for speculatively executed instructions     that never actually commit (retire). As a result, an     unprivileged attacker could use this flaw to cross the     syscall boundary and read privileged memory by     conducting targeted cache side-channel     attacks.(CVE-2017-5753)

  - A flaw was found in the Linux kernel's skcipher     component, which affects the skcipher_recvmsg function.
    Attackers using a specific input can lead to a     privilege escalation.i1/4^CVE-2017-13215i1/4%0

  - The tcpmss_mangle_packet function in     net/netfilter/xt_TCPMSS.c in the Linux kernel before     4.11, and 4.9.x before 4.9.36, allows remote attackers     to cause a denial of service (use-after-free and memory     corruption) or possibly have unspecified other impact     by leveraging the presence of xt_TCPMSS in an iptables     action. Due to the nature of the flaw, privilege     escalation cannot be fully ruled out, although we     believe it is unlikely.i1/4^CVE-2017-18017i1/4%0

  - A kernel data leak due to an out-of-bound read was     found in the Linux kernel in     inet_diag_msg_sctp{,l}addr_fill() and     sctp_get_sctp_info() functions present since version     4.7-rc1 through version 4.13. A data leak happens when     these functions fill in sockaddr data structures used     to export socket's diagnostic information. As a result,     up to 100 bytes of the slab data could be leaked to a     userspace.i1/4^CVE-2017-7558i1/4%0

  - Use-after-free vulnerability in the snd_pcm_info()     function in the ALSA subsystem in the Linux kernel     allows attackers to induce a kernel memory corruption     and possibly crash or lock up a system. Due to the     nature of the flaw, a privilege escalation cannot be     fully ruled out, although we believe it is     unlikely.i1/4^CVE-2017-0861i1/4%0

  - Improper validation in the bnx2x network card driver of     the Linux kernel version 4.15 can allow for denial of     service (DoS) attacks via a packet with a gso_size     larger than ~9700 bytes. Untrusted guest VMs can     exploit this vulnerability in the host machine, causing     a crash in the network card.i1/4^CVE-2018-1000026i1/4%0

  - An error in the '_sctp_make_chunk()' function     (net/sctp/sm_make_chunk.c) when handling SCTP, packet     length can be exploited by a malicious local user to     cause a kernel crash and a DoS.i1/4^CVE-2018-5803i1/4%0

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	名称	产品	系列	发布时间	最近更新时间	严重程度
111703	CentOS 7 : kernel (CESA-2018:2384) (Foreshadow)	Nessus	CentOS Local Security Checks	2018/8/15	2024/8/21	high
125192	RHEL 6 : kernel-rt (RHSA-2019:1190)	Nessus	Red Hat Local Security Checks	2019/5/16	2024/11/6	high
107055	SUSE SLES11 Security Update : kernel (SUSE-SU-2018:0555-1) (Meltdown) (Spectre)	Nessus	SuSE Local Security Checks	2018/2/28	2025/10/27	critical
124992	EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1539)	Nessus	Huawei Local Security Checks	2019/5/14	2024/5/22	critical

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