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In the Linux kernel, the following vulnerability has been resolved:
fbdev: fb_pm2fb: Avoid potential divide by zero error
In `do_fb_ioctl()` of fbmem.c, if cmd is FBIOPUT_VSCREENINFO, var will be copied from user, then go through `fb_set_var()` and `info->fbops->fb_check_var()` which could may be `pm2fb_check_var()`. Along the path, `var->pixclock` won't be modified. This function checks whether reciprocal of `var->pixclock` is too high. If `var->pixclock` is zero, there will be a divide by zero error. So, it is necessary to check whether denominator is zero to avoid crash. As this bug is found by Syzkaller, logs are listed below.
divide error in pm2fb_check_var Call Trace: <TASK> fb_set_var+0x367/0xeb0 drivers/video/fbdev/core/fbmem.c:1015 do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189
| 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-5.4Upgrade linux-aws-fipsUpgrade linux-azureUpgrade linux-gkeUpgrade linux-gcp-5.15Upgrade linux-aws-5.15Upgrade linux-fipsUpgrade linux-aws-5.4Upgrade linux-oracle-5.15Upgrade linux-gcp-4.15Upgrade linux-ibmUpgrade linux-azure-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-nvidiaUpgrade linux-azure-fdeUpgrade linux-oracleUpgrade linux-hweUpgrade linux-raspi-5.4Upgrade linux-bluefieldUpgrade linux-hwe-5.15Upgrade linux-riscv-5.15Upgrade linux-intel-iotgUpgrade linux-realtimeUpgrade linux-raspiUpgrade linux-kvmUpgrade linux-gcpUpgrade linux-azure-5.4Upgrade linux-gcp-fipsUpgrade linux-ibm-5.4Upgrade linux-oracle-5.4Upgrade linux-gkeopUpgrade linux-azure-4.15Upgrade linuxUpgrade linux-awsUpgrade linux-gcp-5.4Upgrade linux-azure-fipsUpgrade linux-aws-hweUpgrade linux-azure-fde-5.15Upgrade linux-lowlatencyUpgrade linux-iot | 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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