What’s Vulnerable › Vulnerabilities

CVE-2021-45486

• Severity: low (CVSS 3.5 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: 2021-12-25 · updated 2026-06-17
• Weakness: CWE-327

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.

Affected products

• Linux kernel: before 5.12.4 — fixed in 5.12.4
• Oracle Communications Cloud Native Core Binding Support Function: 22.1.3
• Oracle Communications Cloud Native Core Network Exposure Function: 22.1.1
• Oracle Communications Cloud Native Core Policy: 22.2.0

How to fix

Upgrade to a fixed version: Linux kernel 5.12.4. Check the vendor advisory for mitigations.

References

• https://arxiv.org/pdf/2112.09604.pdf
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/net/ipv4/route.c?id=aa6dd211e4b1dde9d5dc25d699d35f789ae7eeba
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://arxiv.org/pdf/2112.09604.pdf
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/net/ipv4/route.c?id=aa6dd211e4b1dde9d5dc25d699d35f789ae7eeba
• https://www.oracle.com/security-alerts/cpujul2022.html

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