CVE-2021-46945

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-46945
In the Linux kernel, the following vulnerability has been resolved: ext4: always panic when errors=panic is specified Before commit 014c9caa29d3 ("ext4: make ext4_abort() use __ext4_error()"), the following series of commands would trigger a panic: 1. mount /dev/sda -o ro,errors=panic test 2. mount /dev/sda -o remount,abort test After commit 014c9caa29d3, remounting a file system using the test mount option "abort" will no longer trigger a panic. This commit will restore the behaviour immediately before commit 014c9caa29d3. (However, note that the Linux kernel's behavior has not been consistent; some previous kernel versions, including 5.4 and 4.19 similarly did not panic after using the mount option "abort".) This also makes a change to long-standing behaviour; namely, the following series commands will now cause a panic, when previously it did not: 1. mount /dev/sda -o ro,errors=panic test 2. echo test > /sys/fs/ext4/sda/trigger_fs_error However, this makes ext4's behaviour much more consistent, so this is a good thing.

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/1e9ea8f4637026b8e965128953f2da061ccae9c4 Patch
https://git.kernel.org/stable/c/64e1eebe2131183174f4fbb6b1491355f96c6cde Patch
https://git.kernel.org/stable/c/ac2f7ca51b0929461ea49918f27c11b680f28995 Patch
Configurations

Configuration 1 (hide)

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

10 Apr 2024, 20:11

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/1e9ea8f4637026b8e965128953f2da061ccae9c4 - () https://git.kernel.org/stable/c/1e9ea8f4637026b8e965128953f2da061ccae9c4 - Patch
References () https://git.kernel.org/stable/c/64e1eebe2131183174f4fbb6b1491355f96c6cde - () https://git.kernel.org/stable/c/64e1eebe2131183174f4fbb6b1491355f96c6cde - Patch
References () https://git.kernel.org/stable/c/ac2f7ca51b0929461ea49918f27c11b680f28995 - () https://git.kernel.org/stable/c/ac2f7ca51b0929461ea49918f27c11b680f28995 - Patch
First Time Linux linux Kernel
Linux
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: siempre entra en pánico cuando se especifica errores=panic Antes del commit 014c9caa29d3 ("ext4: make ext4_abort() use __ext4_error()"), la siguiente serie de comandos desencadenaría un pánico: 1. mount /dev/sda -o ro,errors=panic test 2. mount /dev/sda -o remount,abort test Después de el commit 014c9caa29d3, volver a montar un sistema de archivos utilizando la opción de montaje de prueba "abort" ya no provocará pánico . Esta confirmación restaurará el comportamiento inmediatamente anterior a el commit 014c9caa29d3. (Sin embargo, tenga en cuenta que el comportamiento del kernel de Linux no ha sido consistente; algunas versiones anteriores del kernel, incluidas 5.4 y 4.19, tampoco entraron en pánico después de usar la opción de montaje "abortar".) Esto también supone un cambio en el comportamiento de larga data; es decir, los siguientes comandos de la serie ahora causarán pánico, cuando antes no lo hacían: 1. mount /dev/sda -o ro,errors=panic test 2. echo test > /sys/fs/ext4/sda/trigger_fs_error Sin embargo, Esto hace que el comportamiento de ext4 sea mucho más consistente, por lo que es algo bueno.
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE NVD-CWE-noinfo

27 Feb 2024, 19:04

Type Values Removed Values Added
New CVE
Information

Published : 2024-02-27 19:04

Updated : 2024-04-10 20:11

NVD link : CVE-2021-46945

Mitre link : CVE-2021-46945

CVE.ORG link : CVE-2021-46945

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo