CVE-2021-47461

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47461
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47461.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47461
Related
Published
2024-05-22T07:15:11Z
Modified
2024-09-18T03:17:28.519201Z
Summary
[none]
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 exitmmap() and at the same time userfaultfdwriteprotect() is called.

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

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

References

Affected packages

Debian:11 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.84-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+1
5.10.70-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.14.16-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.14.16-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}