Description
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.
References (28)
Scores
CVSS v3
7.5
EPSS
0.1336
EPSS Percentile
94.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-770
CWE-405
Status
published
Products (25)
canonical/ubuntu_linux
14.04
canonical/ubuntu_linux
16.04
canonical/ubuntu_linux
18.04
canonical/ubuntu_linux
18.10
canonical/ubuntu_linux
19.04
f5/big-ip_access_policy_manager
11.5.2 - 11.6.5.1
f5/big-ip_advanced_firewall_manager
11.5.2 - 11.6.5.1
f5/big-ip_analytics
11.5.2 - 11.6.5.1
f5/big-ip_application_acceleration_manager
11.5.2 - 11.6.5.1
f5/big-ip_application_security_manager
11.5.2 - 11.6.5.1
... and 15 more
Published
Jun 19, 2019
Tracked Since
Feb 18, 2026