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.
problem types: CWE-405 Asymmetric Resource Consumption (Amplification)
affected:
{
product: Linux kernel
vendor: Linux
versions:
lessThan: 4.4.182, status: affected, version: 4.4, versionType: custom
lessThan: 4.9.182, status: affected, version: 4.9, versionType: custom
lessThan: 4.14.127, status: affected, version: 4.14, versionType: custom
lessThan: 4.19.52, status: affected, version: 4.19, versionType: custom
lessThan: 5.1.11, status: affected, version: 5.1, versionType: custom
}
metrics:
cvssV3_0: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 5.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
version: 3.0
]