#VU18947 Resource exhaustion in Linux kernel
Vulnerability identifier: #VU18947
Vulnerability risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-400
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Linux kernel
Operating systems & Components /
Operating system
Vendor: 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.
Mitigation
Update your kernel to the latest version.
Vulnerable software versions
Linux kernel: 4.19 - 4.19.51, 4.14 - 4.14.126, 4.9 - 4.9.181, 4.4.0 - 4.4.181, 5.0 - 5.0.21, 5.1 - 5.1.21
External links
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.182
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.182
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.127
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.52
http://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.1.11
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
