// For flags

CVE-2024-26590

erofs: fix inconsistent per-file compression format

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:

erofs: fix inconsistent per-file compression format

EROFS can select compression algorithms on a per-file basis, and each
per-file compression algorithm needs to be marked in the on-disk
superblock for initialization.

However, syzkaller can generate inconsistent crafted images that use
an unsupported algorithmtype for specific inodes, e.g. use MicroLZMA
algorithmtype even it's not set in `sbi->available_compr_algs`. This
can lead to an unexpected "BUG: kernel NULL pointer dereference" if
the corresponding decompressor isn't built-in.

Fix this by checking against `sbi->available_compr_algs` for each
m_algorithmformat request. Incorrect !erofs_sb_has_compr_cfgs preset
bitmap is now fixed together since it was harmless previously.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: erofs: corrige el formato de compresión por archivo inconsistente EROFS puede seleccionar algoritmos de compresión por archivo, y cada algoritmo de compresión por archivo debe marcarse en el superbloque del disco para la inicialización. Sin embargo, syzkaller puede generar imágenes manipuladas inconsistentes que usan un tipo de algoritmo no compatible para inodos específicos, por ejemplo, usa el tipo de algoritmo MicroLZMA incluso si no está configurado en `sbi->available_compr_algs`. Esto puede provocar un "ERROR: desreferencia del puntero NULL del kernel" inesperado si el descompresor correspondiente no está integrado. Solucione este problema comprobando con `sbi->available_compr_algs` para cada solicitud de m_algorithmformat. El mapa de bits preestablecido !erofs_sb_has_compr_cfgs incorrecto ahora se corrige porque antes era inofensivo.

*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
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-02-19 CVE Reserved
  • 2024-02-22 CVE Published
  • 2024-03-19 EPSS Updated
  • 2024-08-02 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-476: NULL Pointer Dereference
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"
 >= 5.16 < 6.1.80
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.16 < 6.1.80"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.16 < 6.6.14
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.16 < 6.6.14"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.16 < 6.7.2
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.16 < 6.7.2"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.16 < 6.8
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.16 < 6.8"
en
Affected