CVE-2021-46952

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-46952
In the Linux kernel, the following vulnerability has been resolved: NFS: fs_context: validate UDP retrans to prevent shift out-of-bounds Fix shift out-of-bounds in xprt_calc_majortimeo(). This is caused by a garbage timeout (retrans) mount option being passed to nfs mount, in this case from syzkaller. If the protocol is XPRT_TRANSPORT_UDP, then 'retrans' is a shift value for a 64-bit long integer, so 'retrans' cannot be >= 64. If it is >= 64, fail the mount and return an error.

7.1 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897 Patch
https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8 Patch
https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2 Patch
https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

10 Apr 2024, 20:15

Type Values Removed Values Added
CWE CWE-125
References () https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897 - () https://git.kernel.org/stable/c/2f3380121d49e829fb73ba86240c181bc32ad897 - Patch
References () https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8 - () https://git.kernel.org/stable/c/3d0163821c035040a46d816a42c0780f0f0a30a8 - Patch
References () https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2 - () https://git.kernel.org/stable/c/96fa26b74cdcf9f5c98996bf36bec9fb5b19ffe2 - Patch
References () https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59 - () https://git.kernel.org/stable/c/c09f11ef35955785f92369e25819bf0629df2e59 - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.1
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

28 Feb 2024, 14:06

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: NFS: fs_context: valida las retransmisiones UDP para evitar cambios fuera de los límites. Corrige cambios fuera de los límites en xprt_calc_majortimeo(). Esto se debe a que se pasa una opción de montaje de tiempo de espera de basura (retransmisión) al montaje nfs, en este caso desde syzkaller. Si el protocolo es XPRT_TRANSPORT_UDP, entonces 'retrans' es un valor de desplazamiento para un entero largo de 64 bits, por lo que 'retrans' no puede ser >= 64. Si es >= 64, falla el montaje y devuelve un error.

27 Feb 2024, 19:04

Type Values Removed Values Added
New CVE
Information

Published : 2024-02-27 19:04

Updated : 2024-04-10 20:15

NVD link : CVE-2021-46952

Mitre link : CVE-2021-46952

CVE.ORG link : CVE-2021-46952

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-125

Out-of-bounds Read