The SUSE Linux Enterprise 11 SP3 LTSS 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-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 exists 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.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:2384 advisory.

    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

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) :

  - 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)

According to the versions of the OVMF / crit / criu / criu-devel / ksm-vz / etc packages installed, the Virtuozzo installation on the remote host is affected by the following vulnerabilities :

  - 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.

  - 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.

  - 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.

  - 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.

  - ALSA sequencer core initializes the event pool on     demand by invoking snd_seq_pool_init() when the first     write happens and the pool is empty. A user can reset     the pool size manually via ioctl concurrently, and this     may lead to UAF or out-of-bound access.

  - The do_get_mempolicy() function in mm/mempolicy.c in     the Linux kernel allows local users to hit a     use-after-free bug via crafted system calls and thus     cause a denial of service (DoS) or possibly have     unspecified other impact. Due to the nature of the     flaw, privilege escalation cannot be fully ruled out.

Note that Tenable Network Security has extracted the preceding description block directly from the Virtuozzo 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
108279	SUSE SLES11 Security Update : kernel (SUSE-SU-2018:0660-1) (Spectre)	Nessus	SuSE Local Security Checks	3/13/2018	2/4/2025	critical
111727	RHEL 7 : kernel (RHSA-2018:2384)	Nessus	Red Hat Local Security Checks	8/15/2018	4/15/2025	high
111778	Scientific Linux Security Update : kernel on SL7.x x86_64 (20180814) (Foreshadow)	Nessus	Scientific Linux Local Security Checks	8/16/2018	8/21/2024	high
112206	Virtuozzo 7 : OVMF / crit / criu / criu-devel / ksm-vz / etc (VZA-2018-063)	Nessus	Virtuozzo Local Security Checks	8/31/2018	8/13/2024	high

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