CVE-2021-47641

video: fbdev: cirrusfb: check pixclock to avoid divide by zero

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

MITRE

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

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2025-02-26 CVE Reserved
2025-02-26 CVE Published
2025-02-26 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (9)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261	2022-04-20
https://git.kernel.org/stable/c/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135	2022-04-20
https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd	2022-04-15
https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d	2022-04-15
https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d	2022-04-08
https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1	2022-04-08
https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99	2022-04-08
https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf	2022-04-08
https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379	2022-01-29

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.9.311 Search vendor "Linux" for product "Linux Kernel" and version " < 4.9.311"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.14.276 Search vendor "Linux" for product "Linux Kernel" and version " < 4.14.276"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.19.238 Search vendor "Linux" for product "Linux Kernel" and version " < 4.19.238"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.4.189 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.189"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.10.110 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.110"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.15.33 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.33"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.16.19 Search vendor "Linux" for product "Linux Kernel" and version " < 5.16.19"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.17.2 Search vendor "Linux" for product "Linux Kernel" and version " < 5.17.2"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.18 Search vendor "Linux" for product "Linux Kernel" and version " < 5.18"		en		Affected