CVE-2022-48821

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2022-48821
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: avoid double fput() on failed usercopy If the copy back to userland fails for the FASTRPC_IOCTL_ALLOC_DMA_BUFF ioctl(), we shouldn't assume that 'buf->dmabuf' is still valid. In fact, dma_buf_fd() called fd_install() before, i.e. "consumed" one reference, leaving us with none. Calling dma_buf_put() will therefore put a reference we no longer own, leading to a valid file descritor table entry for an already released 'file' object which is a straight use-after-free. Simply avoid calling dma_buf_put() and rely on the process exit code to do the necessary cleanup, if needed, i.e. if the file descriptor is still valid.

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/46963e2e0629cb31c96b1d47ddd89dc3d8990b34 Patch
https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215 Patch
https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc Patch
https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5 Patch
https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d Patch
https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34 Patch
https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215 Patch
https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc Patch
https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5 Patch
https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:*
History

25 Sep 2025, 19:36

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CWE CWE-416
References () https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34 - () https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34 - Patch
References () https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215 - () https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215 - Patch
References () https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc - () https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc - Patch
References () https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5 - () https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5 - Patch
References () https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d - () https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d - Patch
CPE cpe:2.3:o:linux:linux_kernel:5.17:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.17:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.17:rc1:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8

21 Nov 2024, 07:34

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34 - () https://git.kernel.org/stable/c/46963e2e0629cb31c96b1d47ddd89dc3d8990b34 -
References () https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215 - () https://git.kernel.org/stable/c/4e6fd2b5fcf8e7119305a6042bd92e7f2b9ed215 -
References () https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc - () https://git.kernel.org/stable/c/76f85c307ef9f10aa2cef1b1d5ee654c1f3345fc -
References () https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5 - () https://git.kernel.org/stable/c/a5ce7ee5fcc07583159f54ab4af5164de00148f5 -
References () https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d - () https://git.kernel.org/stable/c/e4382d0a39f9a1e260d62fdc079ddae5293c037d -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: misc: fastrpc: evitar doble fput() en copia de usuario fallida. Si la copia al área de usuario falla para FASTRPC_IOCTL_ALLOC_DMA_BUFF ioctl(), no debemos asumir que 'buf->dmabuf' aun es válido. De hecho, dma_buf_fd() llamó a fd_install() antes, es decir, "consumió" una referencia, dejándonos sin ninguna. Por lo tanto, llamar a dma_buf_put() colocará una referencia que ya no poseemos, lo que conducirá a una entrada válida en la tabla de descripción de archivos para un objeto 'archivo' ya publicado que es un use-after-free directo. Simplemente evite llamar a dma_buf_put() y confíe en el código de salida del proceso para realizar la limpieza necesaria, si es necesario, es decir, si el descriptor del archivo aún es válido.

16 Jul 2024, 12:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-07-16 12:15

Updated : 2025-09-25 19:36

NVD link : CVE-2022-48821

Mitre link : CVE-2022-48821

CVE.ORG link : CVE-2022-48821

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free