CVE-2022-50102

video: fbdev: arkfb: Fix a divide-by-zero bug in ark_set_pixclock()

State: Published
Severity: Not scored
Published: Jun 18, 2025
Updated: May 11, 2026
Reserved: Jun 18, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

video: fbdev: arkfb: Fix a divide-by-zero bug in ark_set_pixclock()

Since the user can control the arguments of the ioctl() from the user space, under special arguments that may result in a divide-by-zero bug in: drivers/video/fbdev/arkfb.c:784: ark_set_pixclock(info, (hdiv * info->var.pixclock) / hmul); with hdiv=1, pixclock=1 and hmul=2 you end up with (1*1)/2 = (int) 0. and then in: drivers/video/fbdev/arkfb.c:504: rv = dac_set_freq(par->dac, 0, 1000000000 / pixclock); we'll get a division-by-zero.

The following log can reveal it:

divide error: 0000 [#1] PREEMPT SMP KASAN PTI RIP: 0010:ark_set_pixclock drivers/video/fbdev/arkfb.c:504 [inline] RIP: 0010:arkfb_set_par+0x10fc/0x24c0 drivers/video/fbdev/arkfb.c:784 Call Trace: fb_set_var+0x604/0xeb0 drivers/video/fbdev/core/fbmem.c:1034 do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189

Fix this by checking the argument of ark_set_pixclock() first.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	681e14730c73cc2c71af282c001de6bc71c22f00 to before 76b3f0a0b56e53a960a14624a0f48b3d94b5e7e7Affected 681e14730c73cc2c71af282c001de6bc71c22f00 to before b9a66f23612b84617e04412169e155a4b92f632dAffected 681e14730c73cc2c71af282c001de6bc71c22f00 to before a249e1b89ca25e1c34bdf96154e3f6224a91a9afAffected 681e14730c73cc2c71af282c001de6bc71c22f00 to before 0288fa799e273b08839037499d704dc7bdc13e9aAffected 681e14730c73cc2c71af282c001de6bc71c22f00 to before 236c1502520b7b08955467ec2e50b3232e34f1f9Affected 681e14730c73cc2c71af282c001de6bc71c22f00 to before 9ebc5031958c1f3a2795e4533b4091d77c738d14Affected 681e14730c73cc2c71af282c001de6bc71c22f00 to before 15661642511b2b192077684a89f42a8d95d54286Affected 681e14730c73cc2c71af282c001de6bc71c22f00 to before 2f1c4523f7a3aaabe7e53d3ebd378292947e95c8Affected
LinuxLinux	2.6.22Affected before 2.6.22Not affected 4.14.291 through 4.14.Not affected 4.19.256 through 4.19.Not affected 5.4.211 through 5.4.Not affected 5.10.137 through 5.10.Not affected 5.15.61 through 5.15.Not affected 5.18.18 through 5.18.Not affected 5.19.2 through 5.19.*Not affected 6.0 and laterNot affected

Product

Versions

LinuxLinux

681e14730c73cc2c71af282c001de6bc71c22f00 to before 76b3f0a0b56e53a960a14624a0f48b3d94b5e7e7Affected
681e14730c73cc2c71af282c001de6bc71c22f00 to before b9a66f23612b84617e04412169e155a4b92f632dAffected
681e14730c73cc2c71af282c001de6bc71c22f00 to before a249e1b89ca25e1c34bdf96154e3f6224a91a9afAffected
681e14730c73cc2c71af282c001de6bc71c22f00 to before 0288fa799e273b08839037499d704dc7bdc13e9aAffected
681e14730c73cc2c71af282c001de6bc71c22f00 to before 236c1502520b7b08955467ec2e50b3232e34f1f9Affected
681e14730c73cc2c71af282c001de6bc71c22f00 to before 9ebc5031958c1f3a2795e4533b4091d77c738d14Affected
681e14730c73cc2c71af282c001de6bc71c22f00 to before 15661642511b2b192077684a89f42a8d95d54286Affected
681e14730c73cc2c71af282c001de6bc71c22f00 to before 2f1c4523f7a3aaabe7e53d3ebd378292947e95c8Affected

LinuxLinux

2.6.22Affected
before 2.6.22Not affected
4.14.291 through 4.14.*Not affected
4.19.256 through 4.19.*Not affected
5.4.211 through 5.4.*Not affected
5.10.137 through 5.10.*Not affected
5.15.61 through 5.15.*Not affected
5.18.18 through 5.18.*Not affected
5.19.2 through 5.19.*Not affected
6.0 and laterNot affected

References

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