CVE-2024-40900

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-40900
In the Linux kernel, the following vulnerability has been resolved: cachefiles: remove requests from xarray during flushing requests Even with CACHEFILES_DEAD set, we can still read the requests, so in the following concurrency the request may be used after it has been freed: mount | daemon_thread1 | daemon_thread2 ------------------------------------------------------------ cachefiles_ondemand_init_object cachefiles_ondemand_send_req REQ_A = kzalloc(sizeof(*req) + data_len) wait_for_completion(&REQ_A->done) cachefiles_daemon_read cachefiles_ondemand_daemon_read // close dev fd cachefiles_flush_reqs complete(&REQ_A->done) kfree(REQ_A) xa_lock(&cache->reqs); cachefiles_ondemand_select_req req->msg.opcode != CACHEFILES_OP_READ // req use-after-free !!! xa_unlock(&cache->reqs); xa_destroy(&cache->reqs) Hence remove requests from cache->reqs when flushing them to avoid accessing freed requests.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013 Patch
https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19 Patch
https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598 Patch
https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7 Patch
https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013 Patch
https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19 Patch
https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598 Patch
https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7 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:6.10:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.10:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.10:rc3:*:*:*:*:*:*
History

17 Sep 2025, 15:32

Type Values Removed Values Added
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:6.10:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.10:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.10:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE CWE-416
References () https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013 - () https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013 - Patch
References () https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19 - () https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19 - Patch
References () https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598 - () https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598 - Patch
References () https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7 - () https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7 - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8

21 Nov 2024, 09:31

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013 - () https://git.kernel.org/stable/c/0fc75c5940fa634d84e64c93bfc388e1274ed013 -
References () https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19 - () https://git.kernel.org/stable/c/37e19cf86a520d65de1de9cb330415c332a40d19 -
References () https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598 - () https://git.kernel.org/stable/c/50d0e55356ba5b84ffb51c42704126124257e598 -
References () https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7 - () https://git.kernel.org/stable/c/9f13aacdd4ee9a7644b2a3c96d67113cd083c9c7 -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cachefiles: elimina solicitudes de xarray durante las solicitudes de vaciado Incluso con CACHEFILES_DEAD configurado, aún podemos leer las solicitudes, por lo que en la siguiente concurrencia la solicitud se puede usar después de que se haya liberado: mount | daemon_thread1 | daemon_thread2 ------------------------------------------------- --------- Cachefiles_ondemand_init_object Cachefiles_ondemand_send_req req_a = kzalloc (sizeof (*req) + data_len) Wait_for_completion (& req_a-> ded) gratis (req_a ) xa_lock(&cache->reqs); cachefiles_ondemand_select_req req->msg.opcode != CACHEFILES_OP_READ // ¡¡¡requiere use-after-free !!! xa_unlock(&cache->reqs); xa_destroy(&cache->reqs) Por lo tanto, elimine las solicitudes de cache->reqs cuando las vacíe para evitar acceder a las solicitudes liberadas.

12 Jul 2024, 16:34

Type Values Removed Values Added
New CVE
Information

Published : 2024-07-12 13:15

Updated : 2025-09-17 15:32

NVD link : CVE-2024-40900

Mitre link : CVE-2024-40900

CVE.ORG link : CVE-2024-40900

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free