Description
The Linux kernel before 5.17.9 allows TCP servers to identify clients by observing what source ports are used. This occurs because of use of Algorithm 4 ("Double-Hash Port Selection Algorithm") of RFC 6056.
References (6)
Core 6
Core References
Mailing List, Patch, Vendor Advisory x_refsource_misc
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4c2c8f03a5ab7cb04ec64724d7d176d00bcc91e5
Release Notes, Vendor Advisory x_refsource_misc
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.17.9
Mailing List mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html
Various Sources x_refsource_misc
https://arxiv.org/abs/2209.12993
Various Sources x_refsource_misc
https://github.com/0xkol/rfc6056-device-tracker
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2022/dsa-5173
Scores
CVSS v3
3.3
EPSS
0.0043
EPSS Percentile
33.8%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Details
CWE
CWE-330
Status
published
Products (1)
linux/linux_kernel
< 5.17.9
Published
Jun 05, 2022
Tracked Since
Feb 18, 2026