CVE-2021-47004

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47004
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid touching checkpointed data in get_victim() In CP disabling mode, there are two issues when using LFS or SSR | AT_SSR mode to select victim: 1. LFS is set to find source section during GC, the victim should have no checkpointed data, since after GC, section could not be set free for reuse. Previously, we only check valid chpt blocks in current segment rather than section, fix it. 2. SSR | AT_SSR are set to find target segment for writes which can be fully filled by checkpointed and newly written blocks, we should never select such segment, otherwise it can cause panic or data corruption during allocation, potential case is described as below: a) target segment has 'n' (n < 512) ckpt valid blocks b) GC migrates 'n' valid blocks to other segment (segment is still in dirty list) c) GC migrates '512 - n' blocks to target segment (segment has 'n' cp_vblocks and '512 - n' vblocks) d) If GC selects target segment via {AT,}SSR allocator, however there is no free space in targe segment.

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 NONE

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d Patch
https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 Patch
https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff Patch
https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db Patch
https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d Patch
https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 Patch
https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff Patch
https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db 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

08 Jan 2025, 17:43

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.1
CWE NVD-CWE-noinfo
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
References () https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d - () https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d - Patch
References () https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 - () https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 - Patch
References () https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff - () https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff - Patch
References () https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db - () https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db - Patch
First Time Linux
Linux linux Kernel

21 Nov 2024, 06:35

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d - () https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d -
References () https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 - () https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 -
References () https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff - () https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff -
References () https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db - () https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: corrección para evitar tocar datos con puntos de control en get_victim() En el modo de desactivación de CP, hay dos problemas al usar LFS o SSR | Modo AT_SSR para seleccionar a la víctima: 1. LFS está configurado para buscar la sección de origen durante la GC, la víctima no debe tener datos de puntos de control, ya que después de la GC, la sección no se puede liberar para su reutilización. Anteriormente, solo verificábamos los bloques chpt válidos en el segmento actual en lugar de en la sección, lo arreglamos. 2. RSS | AT_SSR está configurado para encontrar un segmento de destino para escrituras que se puede llenar completamente con bloques recién escritos y con puntos de control. Nunca debemos seleccionar dicho segmento; de lo contrario, puede causar pánico o corrupción de datos durante la asignación. El caso potencial se describe a continuación: a) segmento de destino tiene 'n' (n &lt; 512) ckpt bloques válidos b) GC migra 'n' bloques válidos a otro segmento (el segmento todavía está en la lista sucia) c) GC migra '512 - n' bloques al segmento objetivo (el segmento tiene 'n ' cp_vblocks y '512 - n' vblocks) d) Si GC selecciona el segmento de destino mediante el asignador {AT,}SSR, sin embargo, no hay espacio libre en el segmento de destino.

28 Feb 2024, 09:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-02-28 09:15

Updated : 2025-01-08 17:43

NVD link : CVE-2021-47004

Mitre link : CVE-2021-47004

CVE.ORG link : CVE-2021-47004

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo