vulnerability
Debian: CVE-2021-47461: linux -- security update
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:L/AC:M/Au:S/C:N/I:N/A:C) | May 22, 2024 | Jul 30, 2024 | Sep 25, 2025 |
Severity
4
CVSS
(AV:L/AC:M/Au:S/C:N/I:N/A:C)
Published
May 22, 2024
Added
Jul 30, 2024
Modified
Sep 25, 2025
Description
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.
Solution
debian-upgrade-linux
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