#VU18947 Resource exhaustion in Linux kernel - CVE-2019-11479
Published: July 1, 2019 / Updated: June 1, 2020
Vulnerability identifier: #VU18947
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-11479
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a remote attacker to perform denial of service (DoS) attack.
The vulnerability exists due to presence of hard-coded MSS value (48 bytes) in the Linux kernel source code. A remote attacker can fragment TCP resend queues significantly more than if a larger MSS were enforced and perform denial of service (DoS) attack.
Remediation
Update your kernel to the latest version.
External links
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.182
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.182
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.127
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.52
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.1.11
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2