RHEL 7 : kernel-alt (RHSA-2019:0831)

high Nessus Plugin ID 124257


The remote Red Hat host is missing one or more security updates.


An update for kernel-alt 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-alt packages provide the Linux kernel version 4.x.

Security Fix(es) :

* kernel: lack of check for mmap minimum address in expand_downwards in mm/ mmap.c leads to NULL pointer dereferences exploit on non-SMAP platforms (CVE-2019-9213)

* kernel: use-after-free in ucma_leave_multicast in drivers/infiniband/core/ ucma.c (CVE-2018-14734)

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

* kernel: TLB flush happens too late on mremap (CVE-2018-18281)

* kernel: Type confusion in drivers/tty/n_tty.c allows for a denial of service (CVE-2018-18386)

* kernel: userfaultfd bypasses tmpfs file permissions (CVE-2018-18397)

* kernel: Integer overflow in the alarm_timer_nsleep function (CVE-2018-13053)

* kernel: NULL pointer dereference in xfs_da_shrink_inode function (CVE-2018-13094)

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) :

* Failed to boot with ftrace=function in kvm with 2vcpu (BZ#1501024)

* [ALT-7.5][x86_64] perf test 63 - inet_pton fails on x86_64 (BZ#1518836)

* BUG: potential out-of-bounds string access when forcing a SELinux label on a file (BZ#1595706)

* stack out-of-bounds in smb{2,3}_create_lease_buf() on SMB2/SMB3 mounts (BZ# 1598757)

* [ALT-7.6][KVM][PANIC] ltp/lite proc01 - Unable to handle kernel paging request at virtual address ffff7fe000200018 (BZ#1623193)

* Kernel lock up due to read/write lock (BZ#1636261)

* [RHEL-ALT] Fix potential Spectre v1 in tty code (BZ#1639679)

* [Huawei AArch64 7.6 Bug] HNS3: Vlan on HNS3 NIC cannot communicate (BZ# 1639713)

* [RHEL7.6-ALT][AWS] backport 'nvme: update timeout module parameter type' (BZ#1654958)

* ignore STABLE_FLAG of rmap_item->address in rmap_walk_ksm (BZ#1663565)

* RHEL-Alt-7.6 - kernel: zcrypt: fix specification exception on z196 at ap probe (BZ#1670018)

* [Huawei AArch64 7.6 Bug] Flock over NFSv3 failed (BZ#1670650)

* [Huawei AArch64 7.6/7.6-z Bug] HNS3: if a single transmit packet(skb) has more than 8 frags, will cause the NIC to be unavailable (BZ#1677643)

* krb5{,i,p} doesn't work with older enctypes on aarch64 (BZ#1678922)

Users of kernel are advised to upgrade to these updated packages, which fix these bugs.


Update the affected packages.

See Also










Plugin Details

Severity: High

ID: 124257

File Name: redhat-RHSA-2019-0831.nasl

Version: 1.7

Type: local

Agent: unix

Published: 4/24/2019

Updated: 1/24/2020

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent

Risk Information


Risk Factor: High

Score: 7.4


Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5

Vector: AV:L/AC:L/Au:N/C:P/I:P/A:C

Temporal Vector: E:F/RL:OF/RC:C


Risk Factor: High

Base Score: 7.8

Temporal Score: 7.2

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:F/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:kernel, p-cpe:/a:redhat:enterprise_linux:kernel-abi-whitelists, p-cpe:/a:redhat:enterprise_linux:kernel-debug, p-cpe:/a:redhat:enterprise_linux:kernel-debug-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-debug-devel, p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-s390x, p-cpe:/a:redhat:enterprise_linux:kernel-devel, p-cpe:/a:redhat:enterprise_linux:kernel-doc, p-cpe:/a:redhat:enterprise_linux:kernel-headers, p-cpe:/a:redhat:enterprise_linux:kernel-kdump, p-cpe:/a:redhat:enterprise_linux:kernel-kdump-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-kdump-devel, p-cpe:/a:redhat:enterprise_linux:perf, p-cpe:/a:redhat:enterprise_linux:perf-debuginfo, p-cpe:/a:redhat:enterprise_linux:python-perf, p-cpe:/a:redhat:enterprise_linux:python-perf-debuginfo, cpe:/o:redhat:enterprise_linux:7

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/23/2019

Vulnerability Publication Date: 7/2/2018

Exploitable With

Metasploit (Reliable Datagram Sockets (RDS) rds_atomic_free_op NULL pointer dereference Privilege Escalation)

Reference Information

CVE: CVE-2018-13053, CVE-2018-13094, CVE-2018-14734, CVE-2018-17972, CVE-2018-18281, CVE-2018-18386, CVE-2018-18397, CVE-2019-9213

RHSA: 2019:0831