CVE-2021-20261
Ubuntu Security Notice USN-4904-1
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
A race condition was found in the Linux kernels implementation of the floppy disk drive controller driver software. The impact of this issue is lessened by the fact that the default permissions on the floppy device (/dev/fd0) are restricted to root. If the permissions on the device have changed the impact changes greatly. In the default configuration root (or equivalent) permissions are required to attack this flaw.
Se encontró una condición de carrera en la implementación del kernel de Linux del software manejador del controlador de la unidad de disquete. El impacto de este problema es reducido por el hecho de que los permisos predeterminados en el dispositivo de disquete (/dev/fd0) están restringidos para root. Si los permisos en el dispositivo han cambiado, el impacto cambia mucho. En la configuración predeterminada, son requeridos permisos de root (o equivalentes) para atacar este fallo
Ben Harris discovered that the Linux kernel would strip extended privilege attributes of files when performing a failed unprivileged system call. A local attacker could use this to cause a denial of service. Andrey Konovalov discovered that the video4linux driver for Hauppauge HD PVR USB devices in the Linux kernel did not properly handle some error conditions. A physically proximate attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2020-12-17 CVE Reserved
- 2021-03-11 CVE Published
- 2024-08-03 CVE Updated
- 2025-03-30 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CAPEC
References (2)
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Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
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Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | < 4.5 Search vendor "Linux" for product "Linux Kernel" and version " < 4.5" | - |
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 4.5 Search vendor "Linux" for product "Linux Kernel" and version "4.5" | - |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 4.5 Search vendor "Linux" for product "Linux Kernel" and version "4.5" | rc1 |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 4.5 Search vendor "Linux" for product "Linux Kernel" and version "4.5" | rc2 |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 4.5 Search vendor "Linux" for product "Linux Kernel" and version "4.5" | rc3 |
Affected
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Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 4.5 Search vendor "Linux" for product "Linux Kernel" and version "4.5" | rc4 |
Affected
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Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 7.0 Search vendor "Redhat" for product "Enterprise Linux" and version "7.0" | - |
Affected
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