In the Linux kernel, the following vulnerability has been resolved:
video: fbdev: i740fb: Check the argument of i740_calc_vclk()
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.
If the user provides an improper 'pixclock' value that makes the argumet of i740_calc_vclk() less than 'I740_RFREQ_FIX', it will cause a divide-by-zero bug in: drivers/video/fbdev/i740fb.c:353 p_best = min(15, ilog2(I740_MAX_VCO_FREQ / (freq / I740_RFREQ_FIX)));
The following log can reveal it:
divide error: 0000 [#1] PREEMPT SMP KASAN PTI RIP: 0010:i740_calc_vclk drivers/video/fbdev/i740fb.c:353 [inline] RIP: 0010:i740fb_decode_var drivers/video/fbdev/i740fb.c:646 [inline] RIP: 0010:i740fb_set_par+0x163f/0x3b70 drivers/video/fbdev/i740fb.c:742 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 i740_calc_vclk() first.
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-azure-5.15Upgrade linuxUpgrade linux-ibm-5.4Upgrade linux-hwe-5.4Upgrade linux-awsUpgrade linux-oracle-5.4Upgrade linux-aws-hweUpgrade linux-gcpUpgrade linux-aws-fipsUpgrade linux-gcp-fipsUpgrade linux-oracle-5.15Upgrade linux-lowlatencyUpgrade linux-azure-fipsUpgrade linux-gcp-5.4Upgrade linux-azure-fde-5.15Upgrade linux-gkeopUpgrade linux-ibmUpgrade linux-riscv-5.15Upgrade linux-raspi-5.4Upgrade linux-nvidiaUpgrade linux-azureUpgrade linux-hwe-5.15Upgrade linux-fipsUpgrade linux-azure-4.15Upgrade linux-hweUpgrade linux-gcp-5.15Upgrade linux-aws-5.15Upgrade linux-realtimeUpgrade linux-raspiUpgrade linux-intel-iotg-5.15Upgrade linux-gcp-4.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-bluefieldUpgrade linux-oracleUpgrade linux-aws-5.4Upgrade linux-kvmUpgrade linux-intel-iotgUpgrade linux-iotUpgrade linux-azure-5.4Upgrade linux-gke | 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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