CVE-2021-47066

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47066
In the Linux kernel, the following vulnerability has been resolved: async_xor: increase src_offs when dropping destination page Now we support sharing one page if PAGE_SIZE is not equal stripe size. To support this, it needs to support calculating xor value with different offsets for each r5dev. One offset array is used to record those offsets. In RMW mode, parity page is used as a source page. It sets ASYNC_TX_XOR_DROP_DST before calculating xor value in ops_run_prexor5. So it needs to add src_list and src_offs at the same time. Now it only needs src_list. So the xor value which is calculated is wrong. It can cause data corruption problem. I can reproduce this problem 100% on a POWER8 machine. The steps are: mdadm -CR /dev/md0 -l5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 --size=3G mkfs.xfs /dev/md0 mount /dev/md0 /mnt/test mount: /mnt/test: mount(2) system call failed: Structure needs cleaning.

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/29ffa50f33de824b5491f8239c88c4a0efdd03af Patch
https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 Patch
https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 Patch
https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 Patch
https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af Patch
https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 Patch
https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 Patch
https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 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

09 Jan 2025, 19:44

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af - () https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af - Patch
References () https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 - () https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 - Patch
References () https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 - () https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 - Patch
References () https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 - () https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE NVD-CWE-noinfo

21 Nov 2024, 06:35

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af - () https://git.kernel.org/stable/c/29ffa50f33de824b5491f8239c88c4a0efdd03af -
References () https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 - () https://git.kernel.org/stable/c/53f8208e11abd6dde9480dfcb97fecdb1bc2ac18 -
References () https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 - () https://git.kernel.org/stable/c/cab2e8e5997b592fdb7d02cf2387b4b8e3057174 -
References () https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 - () https://git.kernel.org/stable/c/ceaf2966ab082bbc4d26516f97b3ca8a676e2af8 -

01 Mar 2024, 14:04

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: async_xor: aumenta src_offs al eliminar la página de destino. Ahora admitimos compartir una página si PAGE_SIZE no tiene el mismo tamaño de banda. Para respaldar esto, debe admitir el cálculo del valor xor con diferentes compensaciones para cada r5dev. Se utiliza una matriz de desplazamiento para registrar esos desplazamientos. En el modo RMW, la página de paridad se utiliza como página de origen. Establece ASYNC_TX_XOR_DROP_DST antes de calcular el valor xor en ops_run_prexor5. Por lo tanto, es necesario agregar src_list y src_offs al mismo tiempo. Ahora sólo necesita src_list. Entonces el valor xor que se calcula es incorrecto. Puede causar problemas de corrupción de datos. Puedo reproducir este problema al 100% en una máquina POWER8. Los pasos son: mdadm -CR /dev/md0 -l5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 --size=3G mkfs.xfs /dev/md0 mount /dev/md0 /mnt/test mount: /mnt/test: la llamada al sistema mount(2) falló: la estructura necesita limpieza.

29 Feb 2024, 23:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-02-29 23:15

Updated : 2025-01-09 19:44

NVD link : CVE-2021-47066

Mitre link : CVE-2021-47066

CVE.ORG link : CVE-2021-47066

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo