Buffer overflow in Linux kernel - CVE-2019-14835

Vulnerability identifier: #VU21257

CSH Severity: Medium

CVSS v4: 7.3 [CVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-14835

CWE-ID: CWE-119

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to a boundary error within the vhost/vhost_net Linux kernel module during the live migration flow when processing dirty log entries. A privileged guest user can pass descriptors with invalid length to the host when migration is on the way, trigger buffer overflow and execute arbitrary code on the host OS.

Linux kernel
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL
Red Hat Enterprise Linux for x86_64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Slackware Linux
Fedora

kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-alt (Red Hat package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
linux-4.4.199/kernel-generic
linux-4.4.199/kernel-huge
linux-4.4.199/kernel-modules
linux-4.4.199/kernel-headers
kernel-headers
kernel
kernel-tools
Data Computing Appliance (DCA)
Red Hat Virtualization Host
Red Hat Virtualization

Install updates from vendor's website.

Linux kernel - update to 5.3
kernel (Red Hat package) - addressed in versions 2.6.32-431.96.2.el6, 2.6.32-504.81.2.el6, 2.6.32-754.23.1.el6, 3.10.0-327.82.1.el7, 3.10.0-514.69.1.el7, 3.10.0-693.59.1.el7, 3.10.0-862.41.2.el7, 3.10.0-957.35.2.el7, 3.10.0-1062.1.2.el7, 4.18.0-80.11.2.el8_0
Data Computing Appliance (DCA) - update to 3.5.5.0
kernel-rt (Red Hat package) - addressed in versions 3.10.0-1062.1.2.rt56.1025.el7, 4.18.0-80.11.2.rt9.157.el8_0
kernel-alt (Red Hat package) - update to 4.14.0-115.13.1.el7a
linux-4.4.199/kernel-generic - update to 4.4.199
linux-4.4.199/kernel-huge - update to 4.4.199
linux-4.4.199/kernel-modules - update to 4.4.199
linux-4.4.199/kernel-headers - update to 4.4.199_smp
kernel-headers - addressed in versions 5.2.15-100.fc29, 5.2.15-200.fc30, 5.2.16-100.fc29, 5.2.17-100.fc29
kernel - addressed in versions 5.2.15-100.fc29, 5.2.15-200.fc30, 5.2.16-100.fc29, 5.2.17-100.fc29
kernel-tools - update to 5.2.17-100.fc29

• https://www.openwall.com/lists/oss-security/2019/09/17/1
• https://github.com/torvalds/linux/commit/060423bfdee3f8bc6e2c1bac97de24d5415e2bc4
• https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git/commit/?h=for_linus&id=060423b...

• Red Hat update for kpatch-patch
• Red Hat update for kernel
• Red Hat update for kernel
• Red Hat update for kernel-rt
• Privilege escalation in Linux kernel vhost functionality
• Red Hat update for kernel-alt
• Red Hat update for kernel
• Red Hat update for kpatch-patch
• Red Hat update for kernel
• Red Hat update for kernel
• Red Hat update for kernel
• Red Hat update for kernel
• Red Hat update for redhat-virtualization-host
• Red Hat update for kernel
• Red Hat update for kernel
• Red Hat update for kernel
• Red Hat update for redhat-virtualization-host
• Red Hat update for kernel-rt
• Multiple vulnerabilities in Dell EMC Data Computing Appliance (DCA)
• Slackware Linux update for kernel
• Fedora 30 update for kernel, kernel-headers
• Fedora 29 update for kernel, kernel-headers
• Fedora 29 update for kernel, kernel-headers
• Fedora 29 update for kernel, kernel-headers, kernel-tools