Integer overflow in Linux kernel - CVE-2019-18805

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Main Vulnerability Database Vulnerabilities #VU30638

Integer overflow in Linux kernel - CVE-2019-18805

Published: November 7, 2019 / Updated: July 17, 2020


Vulnerability identifier: #VU30638
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-18805
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

An issue was discovered in net/ipv4/sysctl_net_ipv4.c in the Linux kernel before 5.0.11. There is a net/ipv4/tcp_input.c signed integer overflow in tcp_ack_update_rtt() when userspace writes a very large integer to /proc/sys/net/ipv4/tcp_min_rtt_wlen, leading to a denial of service or possibly unspecified other impact, aka CID-19fad20d15a6.


Affected software

Linux kernel
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 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 CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
kernel-alt (Red Hat package)
kernel (Red Hat package)
kernel-rt (Red Hat package)

How to mitigate CVE-2019-18805

Install update from vendor's website.

Linux kernel - update to 5.0.11
kernel-alt (Red Hat package) - update to 4.14.0-115.18.1.el7a
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

External References

Related Security Bulletins