CVE-2021-47461
Description
A possible race condition flaw was found in the Linux kernel. When a process exits, its virtual memory areas (VMAs) are removed by exit_mmap(), and at the same time, userfaultfd_writeprotect() is called.
Détails du score du système commun d'évaluation des vulnérabilités (CVSS)
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
Répartition des scores CVSS v3
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Score de base | 7 | 4.7 | 7.8 |
| Vecteur d'attaque | Local | Local | Local |
| Complexité de l'attaque | High | High | Low |
| Privilèges requis | Low | Low | Low |
| Interaction avec l'utilisateur | None | None | None |
| Champ d'application | Unchanged | Unchanged | Unchanged |
| Confidentialité | High | None | High |
| Impact sur l'intégrité | High | None | High |
| Impact sur la disponibilité | High | High | High |
Vecteur
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Comprendre la Défaillance (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When a race condition makes it possible to bypass a resource cleanup routine or trigger multiple initialization routines, it may lead to resource exhaustion.
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Instability
When a race condition allows multiple control flows to access a resource simultaneously, it might lead the product(s) into unexpected states, possibly resulting in a crash.
Confidentiality,Integrity
Technical Impact: Read Files or Directories; Read Application Data
When a race condition is combined with predictable resource names and loose permissions, it may be possible for an attacker to overwrite or access confidential data (CWE-59).
Access Control
Technical Impact: Execute Unauthorized Code or Commands; Gain Privileges or Assume Identity; Bypass Protection Mechanism
This can have security implications when the expected synchronization is in security-critical code, such as recording whether a user is authenticated or modifying important state information that should not be influenced by an outsider.
Questions fréquemment posées
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