Information disclosure in Linux kernel - CVE-2019-10639

Vulnerability identifier: #VU19187

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-10639

CWE-ID: CWE-200

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to the possibility to extract the Kernel Address Space Layout Randomization (KASLR) kernel image offset of the affected software using the IP ID values that the kernel produces for connectionless protocols. A remote attacker can force the targeted system to send UDP or ICMP traffic to an attacker-controlled IP address and gain unauthorized access to sensitive information on the system.

Linux kernel
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 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
Opensuse
BIG-IP
kernel (Red Hat package)
kernel-rt (Red Hat package)

Install updates from vendor's website.

Linux kernel - update to 5.0.8
kernel (Red Hat package) - update to 4.18.0-193.el8
kernel-rt (Red Hat package) - update to 4.18.0-193.rt13.51.el8

• https://arxiv.org/pdf/1906.10478.pdf
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.0.8
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=355b98553789b646ed97ad801a619ff898471b92
• https://github.com/torvalds/linux/commit/355b98553789b646ed97ad801a619ff898471b92

• Information disclosure in F5 Networks BIG-IP Linux kernel
• OpenSUSE Linux update for the Linux Kernel
• OpenSUSE Linux update for the Linux Kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel