GPU discovery failure via unrestricted BAR0 fallback
Published Oct 6, 2026 · Updated Oct 6, 2026
Improper BAR0 fallback handling in the Linux kernel amdgpu driver disrupts GPU discovery on non-SR-IOV AMD devices with pre-sized BARs. When the normal VRAM aperture is unavailable, amdgpu_device_read_fb_via_bar0() reads through BAR0 without first checking whether the device is an SR-IOV virtual function. A published non-VF Radeon configuration returned invalid IP-discovery data through that path; no attacker-controlled trigger or broader security impact is established.
Summary
What happened
Improper BAR0 fallback handling in the Linux kernel amdgpu driver disrupts GPU discovery on non-SR-IOV AMD devices with pre-sized BARs. When the normal VRAM aperture is unavailable, amdgpu_device_read_fb_via_bar0() reads through BAR0 without first checking whether the device is an SR-IOV virtual function. A published non-VF Radeon configuration returned invalid IP-discovery data through that path; no attacker-controlled trigger or broader security impact is established.
The record
- CVE
- CVE-2026-98165
- Published
- Oct 6, 2026
- Updated
- Oct 6, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 6, 2026CVE publishedPublication date reported by the CVE source.
- Oct 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=7.3-rc1
- Affected versionversion=95eccb9be68df6449d854242b5fcdfd063a2fac1 <5612934c255ad9352d07181f14981cfabd7b7a95
- Affected versionversion=cba4928cdffaa0f9012acff0ec4f896320107077 <bd1f08246b8a2564d8ac61df715b6bcd5f994729
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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