CVE-2021-47461
- 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
- Downstream
- Related
- Published
- 2024-05-22T07:15:11Z
- Modified
- 2025-09-24T12:38:42Z
- Severity
-
- 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- 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