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()…
Does this matter?
Lower severity and a low EPSS score (0.17%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 4.7 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.17% probability · 7th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
EPSS 0.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.