CVE-2022-49348

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  3. CVE-2022-49348

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

I

n the Linux kernel, the following vulnerability has been resolved: ext4: filter out EXT4_FC_REPLAY from on-disk superblock field s_state The EXT4_FC_REPLAY bit in sbi->s_mount_state is used to indicate that we are in the middle of replay the fast commit journal. This was actually a mistake, since the sbi->s_mount_info is initialized from es->s_state. Arguably s_mount_state is misleadingly named, but the name is historical --- s_mount_state and s_state dates back to ext2. What should have been used is the ext4_{set,clear,test}_mount_flag() inline functions, which sets EXT4_MF_* bits in sbi->s_mount_flags. The problem with using EXT4_FC_REPLAY is that a maliciously corrupted superblock could result in EXT4_FC_REPLAY getting set in s_mount_state. This bypasses some sanity checks, and this can trigger a BUG() in ext4_es_cache_extent(). As a easy-to-backport-fix, filter out the EXT4_FC_REPLAY bit for now. We should eventually transition away from EXT4_FC_REPLAY to something like EXT4_MF_REPLAY.

References
Link Resource
https://git.kernel.org/stable/c/55b4dbb29054a05d839562f6d635ce05669b016d Patch
https://git.kernel.org/stable/c/af2f1932743fb52ebcb008ad7ac500d9df0aa796 Patch
https://git.kernel.org/stable/c/b99fd73418350dea360da8311e87a6a7b0e15a4c Patch
https://git.kernel.org/stable/c/c878bea3c9d724ddfa05a813f30de3d25a0ba83f Patch
https://git.kernel.org/stable/c/cc5b09cb6dacd4b32640537929ab4ee8fb2b9e04 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

21 Oct 2025, 12:17

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE NVD-CWE-noinfo
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux linux Kernel
Linux
References () https://git.kernel.org/stable/c/55b4dbb29054a05d839562f6d635ce05669b016d - () https://git.kernel.org/stable/c/55b4dbb29054a05d839562f6d635ce05669b016d - Patch
References () https://git.kernel.org/stable/c/af2f1932743fb52ebcb008ad7ac500d9df0aa796 - () https://git.kernel.org/stable/c/af2f1932743fb52ebcb008ad7ac500d9df0aa796 - Patch
References () https://git.kernel.org/stable/c/b99fd73418350dea360da8311e87a6a7b0e15a4c - () https://git.kernel.org/stable/c/b99fd73418350dea360da8311e87a6a7b0e15a4c - Patch
References () https://git.kernel.org/stable/c/c878bea3c9d724ddfa05a813f30de3d25a0ba83f - () https://git.kernel.org/stable/c/c878bea3c9d724ddfa05a813f30de3d25a0ba83f - Patch
References () https://git.kernel.org/stable/c/cc5b09cb6dacd4b32640537929ab4ee8fb2b9e04 - () https://git.kernel.org/stable/c/cc5b09cb6dacd4b32640537929ab4ee8fb2b9e04 - Patch
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: filtrar EXT4_FC_REPLAY del campo s_state del superbloque en disco El bit EXT4_FC_REPLAY en sbi->s_mount_state se usa para indicar que estamos en medio de la reproducción del diario de confirmación rápida. En realidad, esto fue un error, ya que sbi->s_mount_info se inicializa desde es->s_state. Podría decirse que s_mount_state tiene un nombre engañoso, pero el nombre es histórico --- s_mount_state y s_state se remontan a ext2. Lo que se debería haber usado son las funciones en línea ext4_{set,clear,test}_mount_flag(), que establecen los bits EXT4_MF_* en sbi->s_mount_flags. El problema con el uso de EXT4_FC_REPLAY es que un superbloque dañado maliciosamente podría provocar que EXT4_FC_REPLAY se establezca en s_mount_state. Esto evita algunas comprobaciones de cordura y puede desencadenar un error en ext4_es_cache_extent(). Como solución fácil de implementar, filtre el bit EXT4_FC_REPLAY por ahora. Deberíamos dejar de usar EXT4_FC_REPLAY para pasar a algo como EXT4_MF_REPLAY.

26 Feb 2025, 07:01

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 07:01

Updated : 2025-10-21 12:17

NVD link : CVE-2022-49348

Mitre link : CVE-2022-49348

CVE.ORG link : CVE-2022-49348

JSON object : View

Products Affected

linux

CWE
NVD-CWE-noinfo