What’s Vulnerable › Vulnerabilities

CVE-2022-49572: tcp: Fix data-races around sysctl_tcp_slow_start_after_idle.

• 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_slow_start_after_idle. While reading sysctl_tcp_slow_start_after_idle, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers.

Affected products

• Linux kernel: from 2.6.18 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/0e3f82a03ec8c3808e87283e12946227415706c9
• https://git.kernel.org/stable/c/369d99c2b89f54473adcf9acdf40ea562b5a6e0e
• https://git.kernel.org/stable/c/3b26e11b07a09b31247688bec61e2925d4a571b6
• https://git.kernel.org/stable/c/41aeba4506f6b70ec7500c6fe202731a4ba29fe5
• https://git.kernel.org/stable/c/4845b5713ab18a1bb6e31d1fbb4d600240b8b691
• https://git.kernel.org/stable/c/68b6f9506747d507c7bfa374d178929b4157e8c6

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