In the Linux kernel, the following vulnerability has been resolved:
drm/amd/display: Bound VBIOS record-chain walk loops
[Why & How] All record-chain walk loops in bios_parser.c and bios_parser2.c use for(;;) and only terminate on a 0xFF record_type sentinel or zero record_size. A malformed VBIOS image missing the terminator record causes unbounded iteration at probe time, potentially hundreds of thousands of iterations with record_size=1. In the final iterations near the BIOS image boundary, struct casts beyond the 2-byte header validated by GET_IMAGE can also read out of bounds.
Cap all 14 record-chain walk loops to BIOS_MAX_NUM_RECORD (256) iterations. The atombios.h defines up to 22 distinct record types and atomfirmware.h has 13. Assuming an average of less than 10 records per type (which is reasonable since most are connector- based) 256 is a generous upper bound.
(cherry picked from commit 95700a3d660287ed657d6892f7be9ffc0e294a93)
CVSS Details
- CVSS 3.1 Base Score: 7.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux-6.1Upgrade linux | Jul 19, 2026 | Jul 19, 2026 |
| Redhat_linux | — | No solution exists | Aug 4, 2026 | Jun 25, 2026 |
| Ubuntu | — | Upgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-realtime-7.0Upgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-raspiUpgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-gke-64k-7.0Upgrade linux-image-genericUpgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-azureUpgrade linux-image-gke-64kUpgrade linux-image-nvidia-bosUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-aws-7.0Upgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-awsUpgrade linux-image-7.0.0-1014-azureUpgrade linux-image-gcp-64kUpgrade linux-image-gke-7.0Upgrade linux-image-nvidia-7.0Upgrade linux-image-raspi-7.0Upgrade linux-image-gcp-64k-7.0Upgrade linux-image-7.0.0-1012-awsUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-oem-26.04aUpgrade linux-image-realtime-64kUpgrade linux-image-gcp-7.0Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-azure-lts-26.04Upgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-oem-26.04Upgrade linux-image-nvidiaUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-nvidia-64kUpgrade linux-image-oem-26.04bUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-generic-64k-7.0Upgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-virtual-7.0Upgrade linux-image-generic-7.0Upgrade linux-image-azure-7.0Upgrade linux-image-raspi-realtimeUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-virtualUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-realtimeUpgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-7.0.0-1011-oracleUpgrade linux-image-oracle-7.0Upgrade linux-image-oracleUpgrade linux-image-oem-7.0Upgrade linux-image-ibm-7.0Upgrade linux-image-ibmUpgrade linux-image-gkeUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-oracle-64kUpgrade linux-image-aws-64kUpgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-7.0.0-31-genericUpgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-generic-64kUpgrade linux-image-nvidia-bos-7.0Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-oracle-64k-7.0Upgrade linux-image-nvidia-bos-64kUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-7.0.0-1011-oracle-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-7.0.0-1013-oemUpgrade linux-image-gcp | Sep 14, 2026 | Sep 7, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jul 13, 2026 | Jun 25, 2026 |
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