Kernel warning via uninitialized DRM bridge mutex
Published Jun 24, 2024 · Updated May 11, 2026
Improper locking in Linux kernel 6.2 through 6.6.32, 6.7 through 6.9.3, and 6.10-rc1 allows local users to trigger a lockdep warning. The zynqmp_dp_hpd_work_func calls drm_bridge_hpd_notify before the DRM bridge is always registered, so the notification path attempts to lock an uninitialized hpd_mutex. Reachability requires Zynq UltraScale+ MPSoC hardware with the DisplayPort subsystem active; the published record demonstrates a warning but does not document a crash or code execution.
Summary
What happened
Improper locking in Linux kernel 6.2 through 6.6.32, 6.7 through 6.9.3, and 6.10-rc1 allows local users to trigger a lockdep warning. The zynqmp_dp_hpd_work_func calls drm_bridge_hpd_notify before the DRM bridge is always registered, so the notification path attempts to lock an uninitialized hpd_mutex. Reachability requires Zynq UltraScale+ MPSoC hardware with the DisplayPort subsystem active; the published record demonstrates a warning but does not document a crash or code execution.
The record
- CVE
- CVE-2024-38664
- Published
- Jun 24, 2024
- Updated
- May 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-667
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 24, 2024CVE publishedPublication date reported by the CVE source.
- May 11, 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=6.2
- Affected versionversion=eb2d64bfcc174919a921295a5327b99a3b8f4166 <603661357056b5e5ba6d86f505fbc936eff396ba
- Affected versionversion=eb2d64bfcc174919a921295a5327b99a3b8f4166 <6ead3eccf67bc8318b1ce95ed879b2cc05b4fce9
- Affected versionversion=eb2d64bfcc174919a921295a5327b99a3b8f4166 <be3f3042391d061cfca2bd22630e0d101acea5fc
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What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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