Vulnerability identifier: #VU51269
Vulnerability risk: Medium
Exploitation vector: Network
Exploit availability: No
The vulnerability allows a remote attacker to track devices via UDP packets.
The vulnerability exists due to excessive data output in the flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 and affects net/core/flow_dissector.c and
related code. 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. A remote attacker can use the
hashrnd value and track reliably track activity of devices using UDP packets.
Install updates from vendor's website.
Vulnerable software versions
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?