What’s Vulnerable › Vulnerabilities

CVE-2022-49586: tcp: Fix data-races around sysctl_tcp_fastopen.

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: Fix data-races around sysctl_tcp_fastopen. While reading sysctl_tcp_fastopen, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers.

Affected products

• Linux kernel: from 3.6 before 4.19.254; from 4.20 before 5.4.208; from 5.5 before 5.10.134; from 5.11 before 5.15.58; from 5.16 before 5.18.15; 5.19-rc1, 5.19-rc2, 5.19-rc3, 5.19-rc4, 5.19-rc5, 5.19-rc6 (+1) — fixed in 4.19.254, 5.10.134, 5.15.58, 5.18.15, 5.4.208

How to fix

Upgrade to a fixed version: Linux kernel 4.19.254, 5.10.134, 5.15.58, 5.18.15. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/03da610696a32578fc4f986479341ce9d430df08
• https://git.kernel.org/stable/c/22938534c611136f35e2ca545bb668073ca5ef49
• https://git.kernel.org/stable/c/25d53d858a6c0b89a6e69e376c2a57c4f4c2c8cc
• https://git.kernel.org/stable/c/448ab998947996a0a451f8229f19087964cf2670
• https://git.kernel.org/stable/c/539d9ab79eba3974b479cad61a8688c41fe62e12
• https://git.kernel.org/stable/c/5a54213318c43f4009ae158347aa6016e3b9b55a

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