CVE-2019-11479
Published:June 18, 2019
Updated:May 17, 2026
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.
Affected Packages
linux (ARCHLINUX):
Affected version(s) =5.1.10.arch1-1 <5.1.11.arch1-1Fix Suggestion:
Update to version 5.1.11.arch1-1linux-lts (ARCHLINUX):
Affected version(s) =4.19.51-1 <4.19.51-2Fix Suggestion:
Update to version 4.19.51-2linux-hardened (ARCHLINUX):
Affected version(s) =5.1.10.a-1 <5.1.10.a-2Fix Suggestion:
Update to version 5.1.10.a-2linux-zen (ARCHLINUX):
Affected version(s) =5.1.10.zen1-1 <5.1.11.zen1-1Fix Suggestion:
Update to version 5.1.11.zen1-1linux-yocto (YOCTO):
Affected version(s) >=4.8 <4.8.26+gitAUTOINC+1c60e003c7_27efc3ba68Fix Suggestion:
Update to version 4.8.26+gitAUTOINC+1c60e003c7_27efc3ba68Related Resources (29)
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Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
EPSS
Base Score:
13.36