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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-47641 Detail

Description

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


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135 kernel.org Patch 
https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd kernel.org Patch 
https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99 kernel.org Patch 
https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d kernel.org Patch 
https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379 kernel.org Patch 
https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1 kernel.org Patch 
https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d kernel.org Patch 
https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261 kernel.org Patch 
https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-369 Divide By Zero cwe source acceptance level NIST   CISA-ADP  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-47641
NVD Published Date:
02/26/2025
NVD Last Modified:
10/01/2025
Source:
kernel.org