CVE-2021-47641 | Teknoloji dünyasından en güncel haberleri ve güvenlikle ilgili gelişmeleri takip edin.

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 pixclo…
Medium CVSS: 5.5

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
Vendor
Linux
Product
Linux Kernel
CWE
CWE-369
Yayın Tarihi
2025-02-26 06:37:05
Güncelleme
2025-10-01 20:15:41
Source Identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
KEV Date Added
-

Kategoriler

CWE-369 Linux Kernel MEDIUM Linux 2025

Referanslar

https://git.kernel.org/stable/c/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135 https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99 https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379 https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1 https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261 https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf