Vulnerability Details : CVE-2021-47461
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.
Products affected by CVE-2021-47461
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Exploit prediction scoring system (EPSS) score for CVE-2021-47461
0.12%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 27 %
Percentile, the proportion of vulnerabilities that are scored at or less
References for CVE-2021-47461
-
https://git.kernel.org/stable/c/3cda4bfffd4f755645577aaa9e96a606657b4525
userfaultfd: fix a race between writeprotect and exit_mmap() - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/149958ecd0627a9f1e9c678c25c665400054cd6a
userfaultfd: fix a race between writeprotect and exit_mmap() - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/cb185d5f1ebf900f4ae3bf84cee212e6dd035aca
userfaultfd: fix a race between writeprotect and exit_mmap() - kernel/git/stable/linux.git - Linux kernel stable tree
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