Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.
VOLERION
Volerion Security Research

NOT DEFERRED DATABASE

VULNERABILITIES

CVE-2021-47461 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:4.7 MEDIUMVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA: kernel.orgCVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://git.kernel.org/stable/c/149958ecd0627a9f1e9c678c25c665400054cd6a kernel.orgPatch
https://git.kernel.org/stable/c/3cda4bfffd4f755645577aaa9e96a606657b4525 kernel.orgPatch
https://git.kernel.org/stable/c/cb185d5f1ebf900f4ae3bf84cee212e6dd035aca kernel.orgPatch
https://git.kernel.org/stable/c/149958ecd0627a9f1e9c678c25c665400054cd6a CVEPatch
https://git.kernel.org/stable/c/3cda4bfffd4f755645577aaa9e96a606657b4525 CVEPatch

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')[email protected]

Affected Products

ProductVersions
linux linux kernel
>= 5.7, < 5.10.76
>= 5.11, < 5.14.15
5.15 rc1
5.15 rc2
5.15 rc3

CPE

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

7 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2021-47461
NVD Published Date:
May 22, 2024
NVD Last Modified:
Aug 4, 2026
Source:
kernel.org
CVE-2021-47461 Details - Not Deferred