github - ghsa-q3gr-2743-cwm5

ghsa-q3gr-2743-cwm5

Vulnerability from github

Published

2024-05-22 09:31

Modified

2024-05-22 09:31

Details

In the Linux kernel, the following vulnerability has been resolved:

userfaultfd: fix a race between writeprotect and exit_mmap()

A race is possible when a process exits, its VMAs are removed by exit_mmap() and at the same time userfaultfd_writeprotect() is called.

The race was detected by KASAN on a development kernel, but it appears to be possible on vanilla kernels as well.

Use mmget_not_zero() to prevent the race as done in other userfaultfd operations.

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  "affected": [],
  "aliases": [
    "CVE-2021-47461"
  ],
  "database_specific": {
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    "github_reviewed": false,
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    "nvd_published_at": "2024-05-22T07:15:11Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: fix a race between writeprotect and exit_mmap()\n\nA race is possible when a process exits, its VMAs are removed by\nexit_mmap() and at the same time userfaultfd_writeprotect() is called.\n\nThe race was detected by KASAN on a development kernel, but it appears\nto be possible on vanilla kernels as well.\n\nUse mmget_not_zero() to prevent the race as done in other userfaultfd\noperations.",
  "id": "GHSA-q3gr-2743-cwm5",
  "modified": "2024-05-22T09:31:45Z",
  "published": "2024-05-22T09:31:45Z",
  "references": [
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cve-2021-47461

Vulnerability from cvelistv5

Published

2024-05-22 06:23

Modified

2024-12-19 07:42

Severity ?

Summary

In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a race between writeprotect and exit_mmap() A race is possible when a process exits, its VMAs are removed by exit_mmap() and at the same time userfaultfd_writeprotect() is called. The race was detected by KASAN on a development kernel, but it appears to be possible on vanilla kernels as well. Use mmget_not_zero() to prevent the race as done in other userfaultfd operations.

References

▼	URL	Tags
	https://git.kernel.org/stable/c/3cda4bfffd4f755645577aaa9e96a606657b4525
	https://git.kernel.org/stable/c/149958ecd0627a9f1e9c678c25c665400054cd6a
	https://git.kernel.org/stable/c/cb185d5f1ebf900f4ae3bf84cee212e6dd035aca

Impacted products

Vendor

Product

Version

▼

Linux

Version: 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03
Version: 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03
Version: 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03

Linux

Version: 5.7

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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