What’s Vulnerable › Vulnerabilities

CVE-2022-49571: tcp: Fix data-races around sysctl_tcp_max_reordering.

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

Affected products

• Linux kernel: from 3.19 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/064852663308c801861bd54789d81421fa4c2928
• https://git.kernel.org/stable/c/46deb91ac8a790286ad6d24cf92e7ab0ab2582bb
• https://git.kernel.org/stable/c/50a1d3d097503a90cf84ebe120afcde37e9c33b3
• https://git.kernel.org/stable/c/5e38cee24f19d19280c68f1ac8bf6790d607f60a
• https://git.kernel.org/stable/c/a11e5b3e7a59fde1a90b0eaeaa82320495cf8cae
• https://git.kernel.org/stable/c/ce3731c61589ed73364a5b55ce34131762ef9b60

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