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Vulnerability record · CVE-2022-32296 · published 5 June 2022

CVE-2022-32296: Linux kernel vulnerability

Linux · Linux Kernel

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.

3.3 CVSS 3.1 Low EPSS 0.43% · top 65.5% CWE-330 · CWE-330
3.3CVSS 3.1 base score, v2 2.1
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://arxiv.org/abs/2209.12993
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.17.9 Release NotesVendor Advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4c2c8f03a5ab7cb04ec64724d7d176d00bcc91e5 Mailing ListPatchVendor Advisory
https://github.com/0xkol/rfc6056-device-tracker
https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html
https://www.debian.org/security/2022/dsa-5173
https://arxiv.org/abs/2209.12993
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.17.9 Release NotesVendor Advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4c2c8f03a5ab7cb04ec64724d7d176d00bcc91e5 Mailing ListPatchVendor Advisory
https://github.com/0xkol/rfc6056-device-tracker
https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html
https://www.debian.org/security/2022/dsa-5173

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Source: NIST National Vulnerability Database (record CVE-2022-32296), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.