What’s Vulnerable › Vulnerabilities

CVE-2022-32296

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-06-05 · updated 2026-10-14
• Weakness: CWE-330

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.

Affected products

• Linux kernel: before 5.17.9 — fixed in 5.17.9

How to fix

Upgrade to a fixed version: Linux kernel 5.17.9. Check the vendor advisory for mitigations.

References

• https://arxiv.org/abs/2209.12993
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.17.9
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4c2c8f03a5ab7cb04ec64724d7d176d00bcc91e5
• 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
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4c2c8f03a5ab7cb04ec64724d7d176d00bcc91e5
• 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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