What’s Vulnerable › Vulnerabilities

CVE-2022-49585: tcp: Fix data-races around sysctl_tcp_fastopen_blackhole_timeout.

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

Affected products

• Linux kernel: from 4.12 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 5.10.134, 5.15.58, 5.18.15

How to fix

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

References

• https://git.kernel.org/stable/c/021266ec640c7a4527e6cd4b7349a512b351de1d
• https://git.kernel.org/stable/c/0dc2f19d8c2636cebda7976b5ea40c6d69f0d891
• https://git.kernel.org/stable/c/8afa5604e295046c02b79ccf9e2bbbf8d969d60e
• https://git.kernel.org/stable/c/a77a75a0e7f397550ab039f96115103e78dd5c69

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