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

2024-06-2011:13:26

Linux

www.cve.org

linux kernel

rtnetlink

vulnerability

0.0004 Low

EPSS

Percentile

13.1%

JSON

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.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/core/rtnetlink.c"
    ],
    "versions": [
      {
        "version": "ba7d49b1f0f8",
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    ],
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    ]
  }
]