Information Exposure Affecting linux-4.9 package, versions <4.9.210-1~deb8u1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.3% (70th percentile)

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  • Snyk IDSNYK-DEBIAN8-LINUX49-551886
  • published16 Jan 2020
  • disclosed16 Jan 2020

Introduced: 16 Jan 2020

CVE-2019-18282  (opens in a new tab)
CWE-200  (opens in a new tab)

How to fix?

Upgrade Debian:8 linux-4.9 to version 4.9.210-1~deb8u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-4.9 package and not the linux-4.9 package as distributed by Debian. See How to fix? for Debian:8 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1