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debiancveDebian Security Bug TrackerDEBIANCVE:CVE-2019-11479
HistoryJun 19, 2019 - 12:15 a.m.

CVE-2019-11479

2019-06-1900:15:00
Debian Security Bug Tracker
security-tracker.debian.org
14

0.974 High

EPSS

Percentile

99.9%

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.