What’s Vulnerable › Vulnerabilities

CVE-2022-49637: ipv4: Fix a data-race around sysctl_fib_sync_mem.

• 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: ipv4: Fix a data-race around sysctl_fib_sync_mem. While reading sysctl_fib_sync_mem, it can be changed concurrently. So, we need to add READ_ONCE() to avoid a data-race.

Affected products

• Linux kernel: from 5.2 before 5.4.207; from 5.5 before 5.10.132; from 5.11 before 5.15.56; from 5.16 before 5.18.13; 5.19-rc1, 5.19-rc2, 5.19-rc3, 5.19-rc4, 5.19-rc5, 5.19-rc6 — fixed in 5.10.132, 5.15.56, 5.18.13, 5.4.207

How to fix

Upgrade to a fixed version: Linux kernel 5.10.132, 5.15.56, 5.18.13, 5.4.207. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/190cd4ff128373271e065afb20f1d2247b3f10c3
• https://git.kernel.org/stable/c/418b191d5f223a8cb6cab09eae1f72c04ba6adf2
• https://git.kernel.org/stable/c/73318c4b7dbd0e781aaababff17376b2894745c0
• https://git.kernel.org/stable/c/7c1acd98fb221dc0d847451b9ab86319f8b9916c
• https://git.kernel.org/stable/c/9be8aac91960ea32fd0e874758c9afee665c57d2

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