5.5

CVE-2021-47641

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

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
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version < 4.9.311
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.276
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.238
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.189
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.110
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.33
Linux ≫ Linux Kernel Version >= 5.16 < 5.16.19
Linux ≫ Linux Kernel Version >= 5.17 < 5.17.2
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.24% 0.149
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
134c704f-9b21-4f2e-91b3-4a467353bcc0 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-369 Divide By Zero

The product divides a value by zero.

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