What’s Vulnerable › Vulnerabilities

CVE-2022-48742: rtnetlink: make sure to refresh master_dev/m_ops in __rtnl_newlink()

• Severity: high (CVSS 7.8 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: 2024-06-20 · updated 2026-08-04
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: rtnetlink: make sure to refresh master_dev/m_ops in __rtnl_newlink() While looking at one unrelated syzbot bug, I found the replay logic in __rtnl_newlink() to potentially trigger use-after-free. It is better to clear master_dev and m_ops inside the loop, in case we have to replay it.

Affected products

• Linux kernel: from 3.14 before 4.9.300; from 4.10 before 4.14.265; from 4.15 before 4.19.228; from 4.20 before 5.4.177; from 5.5 before 5.10.97; from 5.11 before 5.15.20 — fixed in 4.14.265, 4.19.228, 4.9.300, 5.10.97, 5.15.20, 5.16.6

How to fix

Upgrade to a fixed version: Linux kernel 4.14.265, 4.19.228, 4.9.300, 5.10.97. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2cf180360d66bd657e606c1217e0e668e6faa303
• https://git.kernel.org/stable/c/36a9a0aee881940476b254e0352581401b23f210
• https://git.kernel.org/stable/c/3bbe2019dd12b8d13671ee6cda055d49637b4c39
• https://git.kernel.org/stable/c/7d9211678c0f0624f74cdff36117ab8316697bb8
• https://git.kernel.org/stable/c/a01e60a1ec6bef9be471fb7182a33c6d6f124e93
• https://git.kernel.org/stable/c/bd43771ee9759dd9dfae946bff190e2c5a120de5
• https://git.kernel.org/stable/c/c6f6f2444bdbe0079e41914a35081530d0409963
• https://git.kernel.org/stable/c/def5e7070079b2a214b3b1a2fbec623e6fbfe34a
• https://git.kernel.org/stable/c/2cf180360d66bd657e606c1217e0e668e6faa303
• https://git.kernel.org/stable/c/36a9a0aee881940476b254e0352581401b23f210
• https://git.kernel.org/stable/c/3bbe2019dd12b8d13671ee6cda055d49637b4c39
• https://git.kernel.org/stable/c/7d9211678c0f0624f74cdff36117ab8316697bb8

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