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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jun 20, 2025 | Jun 20, 2025 |
| Dell Powerstore Dsa2025429 | — | Upgrade Dell PowerStoreOS to the latest version | Dec 3, 2025 | Dec 2, 2025 |
| Dell Powerstore Dsa2026039 | — | Upgrade Dell PowerStoreOS to the latest version | Jan 13, 2026 | Jan 6, 2026 |
| Ubuntu | — | Upgrade linux-hwe-5.15Upgrade linux-gcp-5.15Upgrade linux-kvmUpgrade linux-intel-iotgUpgrade linux-aws-5.15Upgrade linux-realtimeUpgrade linux-oracle-5.15Upgrade linux-azure-fipsUpgrade linux-gkeopUpgrade linux-aws-5.4Upgrade linux-raspiUpgrade linux-aws-hweUpgrade linux-nvidiaUpgrade linux-azure-5.15Upgrade linux-fipsUpgrade linux-lowlatencyUpgrade linux-gkeUpgrade linux-oracleUpgrade linux-oracle-5.4Upgrade linux-azure-fdeUpgrade linux-riscv-5.15Upgrade linux-awsUpgrade linux-intel-iotg-5.15Upgrade linuxUpgrade linux-iotUpgrade linux-gcp-4.15Upgrade linux-azure-5.4Upgrade linux-ibmUpgrade linux-raspi-5.4Upgrade linux-gcpUpgrade linux-azure-4.15Upgrade linux-gcp-5.4Upgrade linux-hwe-5.4Upgrade linux-aws-fipsUpgrade linux-azureUpgrade linux-gcp-fipsUpgrade linux-ibm-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-hweUpgrade linux-bluefield | Jun 26, 2025 | Jun 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Jun 18, 2025 |
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