CVE-2022-49393

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-49393
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: fix list iterator in fastrpc_req_mem_unmap_impl This is another instance of incorrect use of list iterator and checking it for NULL. The list iterator value 'map' will *always* be set and non-NULL by list_for_each_entry(), so it is incorrect to assume that the iterator value will be NULL if the list is empty (in this case, the check 'if (!map) {' will always be false and never exit as expected). To fix the bug, use a new variable 'iter' as the list iterator, while use the original variable 'map' as a dedicated pointer to point to the found element. Without this patch, Kernel crashes with below trace: Unable to handle kernel access to user memory outside uaccess routines at virtual address 0000ffff7fb03750 ... Call trace: fastrpc_map_create+0x70/0x290 [fastrpc] fastrpc_req_mem_map+0xf0/0x2dc [fastrpc] fastrpc_device_ioctl+0x138/0xc60 [fastrpc] __arm64_sys_ioctl+0xa8/0xec invoke_syscall+0x48/0x114 el0_svc_common.constprop.0+0xd4/0xfc do_el0_svc+0x28/0x90 el0_svc+0x3c/0x130 el0t_64_sync_handler+0xa4/0x130 el0t_64_sync+0x18c/0x190 Code: 14000016 f94000a5 eb05029f 54000260 (b94018a6) ---[ end trace 0000000000000000 ]---

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/2d12905aad462383f4e7a5fdb024d2b7ae2d10cf Patch
https://git.kernel.org/stable/c/c5c07c5958cf0c9af6e76813e6de15d42ee49822 Patch
Configurations

Configuration 1 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

22 Sep 2025, 19:46

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: misc: fastrpc: fix list iterator in fastrpc_req_mem_unmap_impl Este es otro ejemplo de uso incorrecto del iterador de lista y verificación de NULL. El valor del iterador de lista 'map' *siempre* se establecerá y no será NULL por list_for_each_entry(), por lo que es incorrecto asumir que el valor del iterador será NULL si la lista está vacía (en este caso, la verificación 'if (!map) {' siempre será falsa y nunca saldrá como se esperaba). Para corregir el error, use una nueva variable 'iter' como iterador de lista, mientras usa la variable original 'map' como un puntero dedicado para apuntar al elemento encontrado. Sin este parche, el kernel se bloquea con el siguiente seguimiento: No se puede gestionar el acceso del kernel a la memoria del usuario fuera de las rutinas uaccess en la dirección virtual 0000ffff7fb03750 ... Call trace: fastrpc_map_create+0x70/0x290 [fastrpc] fastrpc_req_mem_map+0xf0/0x2dc [fastrpc] fastrpc_device_ioctl+0x138/0xc60 [fastrpc] __arm64_sys_ioctl+0xa8/0xec invoke_syscall+0x48/0x114 el0_svc_common.constprop.0+0xd4/0xfc do_el0_svc+0x28/0x90 el0_svc+0x3c/0x130 el0t_64_sync_handler+0xa4/0x130 el0t_64_sync+0x18c/0x190 Code: 14000016 f94000a5 eb05029f 54000260 (b94018a6) ---[ end trace 0000000000000000 ]---
References () https://git.kernel.org/stable/c/2d12905aad462383f4e7a5fdb024d2b7ae2d10cf - () https://git.kernel.org/stable/c/2d12905aad462383f4e7a5fdb024d2b7ae2d10cf - Patch
References () https://git.kernel.org/stable/c/c5c07c5958cf0c9af6e76813e6de15d42ee49822 - () https://git.kernel.org/stable/c/c5c07c5958cf0c9af6e76813e6de15d42ee49822 - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE CWE-670
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

26 Feb 2025, 07:01

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 07:01

Updated : 2025-09-22 19:46

NVD link : CVE-2022-49393

Mitre link : CVE-2022-49393

CVE.ORG link : CVE-2022-49393

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-670

Always-Incorrect Control Flow Implementation