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Vulnerability record · CVE-2021-45486 · published 25 December 2021

CVE-2021-45486: Linux kernel broken cryptographic algorithm vulnerability

Linux · Linux Kernel

In the IPv4 implementation in the Linux kernel before 5.12.4, net/ipv4/route.c has an information leak because the hash table is very small.

3.5 CVSS 3.1 Low EPSS 0.37% · top 71.9% CWE-327 · Broken cryptographic algorithm
3.5CVSS 3.1 base score, v2 2.7
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

In the IPv4 implementation in the Linux kernel before 5.12.4, net/ipv4/route.c has an information leak because the hash table is very small.

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

Affected products

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

References

LinkTags
https://arxiv.org/pdf/2112.09604.pdf Technical DescriptionThird Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4 Release NotesVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/net/ipv4/route.c?id=aa6dd211e4b1dde9d5dc25d699d3 PatchVendor Advisory
https://www.oracle.com/security-alerts/cpujul2022.html PatchThird Party Advisory
https://arxiv.org/pdf/2112.09604.pdf Technical DescriptionThird Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4 Release NotesVendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/net/ipv4/route.c?id=aa6dd211e4b1dde9d5dc25d699d3 PatchVendor Advisory
https://www.oracle.com/security-alerts/cpujul2022.html PatchThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-45486), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.