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cvelistMitreCVELIST:CVE-2019-18282
HistoryJan 16, 2020 - 3:22 p.m.

CVE-2019-18282

2020-01-1615:22:58
mitre
www.cve.org
11
linux kernel
device tracking vulnerability
udp ipv6 packet
hashrnd value
jhash
siphash
net/core/flow_dissector.c

AI Score

6.6

Confidence

Low

EPSS

0.002

Percentile

64.8%

The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 has a device tracking vulnerability, aka CID-55667441c84f. This occurs because the auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a secret, and because jhash (instead of siphash) is used. The hashrnd value remains the same starting from boot time, and can be inferred by an attacker. This affects net/core/flow_dissector.c and related code.