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

What is CVE-2022-49586?

CVE-2022-49586 is a medium-severity vulnerability in Linux kernel, published on 26 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-362

Which versions are affected by CVE-2022-49586?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2022-49586?

Apply the vendor's patch.

Is CVE-2022-49586 being exploited?

There is no known exploitation of CVE-2022-49586 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2022-49586, GHSA-f3w2-gcgx-qw4p, UBUNTU-CVE-2022-49586.