Kernel compromise via uninitialized firmware fence release
Published Oct 21, 2024 · Updated Aug 5, 2026
Use-after-free in the AMD GPU scheduler in Linux 6.0 through 6.0.12 allows local users to read or alter kernel memory or crash the system. The amdgpu job-free path releases fw_fence after recovery even when dma_fence_init did not initialize it, underflowing its reference count and accessing freed storage. Low-privileged local access to an AMD GPU render node and command-stream or context operations is required; exploitation can expose or modify kernel data or interrupt the host.
Summary
What happened
Use-after-free in the AMD GPU scheduler in Linux 6.0 through 6.0.12 allows local users to read or alter kernel memory or crash the system. The amdgpu job-free path releases fw_fence after recovery even when dma_fence_init did not initialize it, underflowing its reference count and accessing freed storage. Low-privileged local access to an AMD GPU render node and command-stream or context operations is required; exploitation can expose or modify kernel data or interrupt the host.
The record
- CVE
- CVE-2022-48990
- Published
- Oct 21, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 21, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.0
- Affected versionversion=f6a3f66063ca39e7ee5fcee59e889c5ec4de9dc0 <3cb93f390453cde4d6afda1587aaa00e75e09617
- Affected versionversion=f6a3f66063ca39e7ee5fcee59e889c5ec4de9dc0 <d2a89cd942edd50c1e652004fd64019be78b0a96
What conditions does exploitation require?
What is affected?
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.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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