CVE-2021-20200
kernel: close race between munmap() and expand_upwards()/downwards()
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 24, 2020
Updated · June 28, 2026
Description
A flaw was found in the Linux kernel. A race condition in mm/mmap.c in VMA access could allow a local attacker with user privileges to crash the system or lead to information leakage. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Statement
Red Hat Product Security does not consider this to be a vulnerability and this CVE has been revoked.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.
CVSS / CWE
CVSS 3.1 · 0CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:N
CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition