// For flags

CVE-2021-46945

ext4: always panic when errors=panic is specified

Severity Score

5.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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.

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.

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.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
Single
Confidentiality
None
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-02-25 CVE Reserved
  • 2024-02-27 CVE Published
  • 2024-04-21 EPSS Updated
  • 2024-12-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.11 < 5.11.20
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.11 < 5.11.20"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.11 < 5.12.3
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.11 < 5.12.3"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.11 < 5.13
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.11 < 5.13"
en
Affected