CVE-2021-47276

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47276
In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ftrace_bug() It was reported that a bug on arm64 caused a bad ip address to be used for updating into a nop in ftrace_init(), but the error path (rightfully) returned -EINVAL and not -EFAULT, as the bug caused more than one error to occur. But because -EINVAL was returned, the ftrace_bug() tried to report what was at the location of the ip address, and read it directly. This caused the machine to panic, as the ip was not pointing to a valid memory address. Instead, read the ip address with copy_from_kernel_nofault() to safely access the memory, and if it faults, report that the address faulted, otherwise report what was in that location.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 Patch
https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 Patch
https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b Patch
https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 Patch
https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 Patch
https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb Patch
https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 Patch
https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 Patch
https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 Patch
https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 Patch
https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b Patch
https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 Patch
https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 Patch
https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb Patch
https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 Patch
https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*
History

30 Apr 2025, 14:46

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 - () https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 - Patch
References () https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 - () https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 - Patch
References () https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b - () https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b - Patch
References () https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 - () https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 - Patch
References () https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 - () https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 - Patch
References () https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb - () https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb - Patch
References () https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 - () https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 - Patch
References () https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 - () https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 - Patch
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux linux Kernel
Linux
CWE CWE-706

21 Nov 2024, 06:35

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ftrace: no lea ciegamente la dirección IP en ftrace_bug(). Se informó que un error en arm64 provocó que se usara una dirección IP incorrecta para actualizar a un nop en ftrace_init() , pero la ruta de error (con razón) devolvió -EINVAL y no -EFAULT, ya que el error provocó que ocurriera más de un error. Pero debido a que se devolvió -EINVAL, ftrace_bug() intentó informar qué había en la ubicación de la dirección IP y leerlo directamente. Esto provocó que la máquina entrara en pánico, ya que la IP no apuntaba a una dirección de memoria válida. En su lugar, lea la dirección IP con copy_from_kernel_nofault() para acceder de forma segura a la memoria y, si falla, informe que la dirección falló; de lo contrario, informe qué había en esa ubicación.
References () https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 - () https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 -
References () https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 - () https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 -
References () https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b - () https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b -
References () https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 - () https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 -
References () https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 - () https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 -
References () https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb - () https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb -
References () https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 - () https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 -
References () https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 - () https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 -

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2025-04-30 14:46

NVD link : CVE-2021-47276

Mitre link : CVE-2021-47276

CVE.ORG link : CVE-2021-47276

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-706

Use of Incorrectly-Resolved Name or Reference