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
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| 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-iotUpgrade linux-ibm-5.4Upgrade linux-azure-4.15Upgrade linux-oracle-5.4Upgrade linux-gcp-5.4Upgrade linux-lowlatencyUpgrade linux-aws-hweUpgrade linux-azure-fipsUpgrade linux-gkeopUpgrade linux-azure-fde-5.15Upgrade linux-awsUpgrade linuxUpgrade linux-nvidiaUpgrade linux-azureUpgrade linux-fipsUpgrade linux-raspi-5.4Upgrade linux-hweUpgrade linux-gkeUpgrade linux-raspiUpgrade linux-kvmUpgrade linux-realtimeUpgrade linux-oracle-5.15Upgrade linux-hwe-5.4Upgrade linux-ibmUpgrade linux-gcp-4.15Upgrade linux-bluefieldUpgrade linux-intel-iotg-5.15Upgrade linux-gcp-5.15Upgrade linux-aws-fipsUpgrade linux-aws-5.15Upgrade linux-intel-iotgUpgrade linux-gcpUpgrade linux-aws-5.4Upgrade linux-oracleUpgrade linux-lowlatency-hwe-5.15Upgrade linux-azure-fdeUpgrade linux-hwe-5.15Upgrade linux-riscv-5.15Upgrade linux-gcp-fipsUpgrade linux-azure-5.4Upgrade linux-azure-5.15 | 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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