CVE-2021-47641

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47641
In the Linux kernel, the following vulnerability has been resolved: video: fbdev: cirrusfb: check pixclock to avoid divide by zero Do a sanity check on pixclock value to avoid divide by zero. If the pixclock value is zero, the cirrusfb driver will round up pixclock to get the derived frequency as close to maxclock as possible. Syzkaller reported a divide error in cirrusfb_check_pixclock. divide error: 0000 [#1] SMP KASAN PTI CPU: 0 PID: 14938 Comm: cirrusfb_test Not tainted 5.15.0-rc6 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2 RIP: 0010:cirrusfb_check_var+0x6f1/0x1260 Call Trace: fb_set_var+0x398/0xf90 do_fb_ioctl+0x4b8/0x6f0 fb_ioctl+0xeb/0x130 __x64_sys_ioctl+0x19d/0x220 do_syscall_64+0x3a/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae

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/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135 Patch
https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd Patch
https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99 Patch
https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d Patch
https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379 Patch
https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1 Patch
https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d Patch
https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261 Patch
https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf 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:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

18 Mar 2025, 19:09

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: video: fbdev: cirrusfb: comprobar pixclock para evitar la división por cero Realice una comprobación de la depuración del valor de pixclock para evitar la división por cero. Si el valor de pixclock es cero, el controlador cirrusfb redondeará el valor de pixclock para obtener la frecuencia derivada lo más cercana posible a maxclock. Syzkaller informó un error de división en cirrusfb_check_pixclock. Error de división: 0000 [#1] SMP KASAN PTI CPU: 0 PID: 14938 Comm: cirrusfb_test No contaminado 5.15.0-rc6 #1 Nombre del hardware: PC estándar QEMU (i440FX + PIIX, 1996), BIOS 1.11.0-2 RIP: 0010:cirrusfb_check_var+0x6f1/0x1260 Seguimiento de llamadas: fb_set_var+0x398/0xf90 do_fb_ioctl+0x4b8/0x6f0 fb_ioctl+0xeb/0x130 __x64_sys_ioctl+0x19d/0x220 do_syscall_64+0x3a/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae
References () https://git.kernel.org/stable/c/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135 - () https://git.kernel.org/stable/c/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135 - Patch
References () https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd - () https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd - Patch
References () https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99 - () https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99 - Patch
References () https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d - () https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d - Patch
References () https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379 - () https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379 - Patch
References () https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1 - () https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1 - Patch
References () https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d - () https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d - Patch
References () https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261 - () https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261 - Patch
References () https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf - () https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf - Patch
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE CWE-369
First Time Linux linux Kernel
Linux
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5

26 Feb 2025, 06:37

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 06:37

Updated : 2025-03-18 19:09

NVD link : CVE-2021-47641

Mitre link : CVE-2021-47641

CVE.ORG link : CVE-2021-47641

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-369

Divide By Zero