CVE-2024-56755

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-56755
In the Linux kernel, the following vulnerability has been resolved: netfs/fscache: Add a memory barrier for FSCACHE_VOLUME_CREATING In fscache_create_volume(), there is a missing memory barrier between the bit-clearing operation and the wake-up operation. This may cause a situation where, after a wake-up, the bit-clearing operation hasn't been detected yet, leading to an indefinite wait. The triggering process is as follows: [cookie1] [cookie2] [volume_work] fscache_perform_lookup fscache_create_volume fscache_perform_lookup fscache_create_volume fscache_create_volume_work cachefiles_acquire_volume clear_and_wake_up_bit test_and_set_bit test_and_set_bit goto maybe_wait goto no_wait In the above process, cookie1 and cookie2 has the same volume. When cookie1 enters the -no_wait- process, it will clear the bit and wake up the waiting process. If a barrier is missing, it may cause cookie2 to remain in the -wait- process indefinitely. In commit 3288666c7256 ("fscache: Use clear_and_wake_up_bit() in fscache_create_volume_work()"), barriers were added to similar operations in fscache_create_volume_work(), but fscache_create_volume() was missed. By combining the clear and wake operations into clear_and_wake_up_bit() to fix this issue.

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/22f9400a6f3560629478e0a64247b8fcc811a24d Patch
https://git.kernel.org/stable/c/539fabba965e119b98066fc6ba5257b5eaf4eda2 Patch
https://git.kernel.org/stable/c/8beb682cc9a0798a280bbb95e3e41617237090b2 Patch
https://git.kernel.org/stable/c/8cc1df3113cb71a0df2c46dd5b102c9e11c8a8c6 Patch
https://git.kernel.org/stable/c/ddab02607eed9e415dc62fde421d4329e5345315 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

06 Jan 2025, 20:26

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfs/fscache: Agregar una barrera de memoria para FSCACHE_VOLUME_CREATING En fscache_create_volume(), falta una barrera de memoria entre la operación de desinfección de bits y la operación de activación. Esto puede provocar una situación en la que, después de una activación, la operación de desinfección de bits aún no se haya detectado, lo que lleva a una espera indefinida. El proceso de activación es el siguiente: [cookie1] [cookie2] [volume_work] fscache_perform_lookup fscache_create_volume fscache_perform_lookup fscache_create_volume fscache_create_volume_work cachefiles_acquire_volume clear_and_wake_up_bit test_and_set_bit test_and_set_bit goto maybe_wait goto no_wait En el proceso anterior, cookie1 y cookie2 tienen el mismo volumen. Cuando cookie1 ingresa al proceso -no_wait-, borrará el bit y activará el proceso en espera. Si falta una barrera, puede provocar que cookie2 permanezca en el proceso -wait- indefinidamente. En el commit 3288666c7256 ("fscache: Use clear_and_wake_up_bit() in fscache_create_volume_work()"), se agregaron barreras a operaciones similares en fscache_create_volume_work(), pero se omitió fscache_create_volume(). Al combinar las operaciones clear y wake en clear_and_wake_up_bit() se solucionó este problema.
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE CWE-401
First Time Linux
Linux linux Kernel
References () https://git.kernel.org/stable/c/22f9400a6f3560629478e0a64247b8fcc811a24d - () https://git.kernel.org/stable/c/22f9400a6f3560629478e0a64247b8fcc811a24d - Patch
References () https://git.kernel.org/stable/c/539fabba965e119b98066fc6ba5257b5eaf4eda2 - () https://git.kernel.org/stable/c/539fabba965e119b98066fc6ba5257b5eaf4eda2 - Patch
References () https://git.kernel.org/stable/c/8beb682cc9a0798a280bbb95e3e41617237090b2 - () https://git.kernel.org/stable/c/8beb682cc9a0798a280bbb95e3e41617237090b2 - Patch
References () https://git.kernel.org/stable/c/8cc1df3113cb71a0df2c46dd5b102c9e11c8a8c6 - () https://git.kernel.org/stable/c/8cc1df3113cb71a0df2c46dd5b102c9e11c8a8c6 - Patch
References () https://git.kernel.org/stable/c/ddab02607eed9e415dc62fde421d4329e5345315 - () https://git.kernel.org/stable/c/ddab02607eed9e415dc62fde421d4329e5345315 - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5

29 Dec 2024, 12:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-12-29 12:15

Updated : 2025-01-06 20:26

NVD link : CVE-2024-56755

Mitre link : CVE-2024-56755

CVE.ORG link : CVE-2024-56755

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-401

Missing Release of Memory after Effective Lifetime