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

high Nessus Plugin ID 124257
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


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

Dependencies: ssh_get_info.nasl, linux_alt_patch_detect.nasl

Risk Information


Risk Factor: Medium

Score: 6.7


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