What’s Vulnerable › Vulnerabilities

CVE-2022-49573: tcp: Fix a data-race around sysctl_tcp_early_retrans.

• 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 a data-race around sysctl_tcp_early_retrans. While reading sysctl_tcp_early_retrans, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader.

Affected products

• Linux kernel: from 3.5 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/11e8b013d16e5db63f8f76acceb5b86964098aaa
• https://git.kernel.org/stable/c/488d3ad98ef7cddce7054193dbae6b4349c6807d
• https://git.kernel.org/stable/c/5037ca9e4b169cc9aed0174d658c3d81fdaf8ea5
• https://git.kernel.org/stable/c/52e65865deb6a36718a463030500f16530eaab74
• https://git.kernel.org/stable/c/83767fe800a311370330d4ec83aa76093b744a80
• https://git.kernel.org/stable/c/d5975f6376ce90c2c483ae36bf88c9cface4c13b

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