Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.7, < 5.10.76 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/149958ecd0627a9f1e9c678c25c665400054cd6aPatch
- https://git.kernel.org/stable/c/3cda4bfffd4f755645577aaa9e96a606657b4525Patch
- https://git.kernel.org/stable/c/cb185d5f1ebf900f4ae3bf84cee212e6dd035acaPatch
- https://git.kernel.org/stable/c/149958ecd0627a9f1e9c678c25c665400054cd6aPatch
- https://git.kernel.org/stable/c/3cda4bfffd4f755645577aaa9e96a606657b4525Patch
- https://git.kernel.org/stable/c/cb185d5f1ebf900f4ae3bf84cee212e6dd035acaPatch
FAQ
What is CVE-2021-47461?
CVE-2021-47461 is a vulnerability with a CVSS score of 4.7 (MEDIUM). 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...
How severe is CVE-2021-47461?
CVE-2021-47461 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47461?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.