Local service deadlock via out-of-range register dump
Published Sep 11, 2026 · Updated Sep 11, 2026
Denial of service in Linux kernel 6.15 allows local users to deadlock Rockchip Samsung D/C-PHY operations via a debugfs register dump. The driver's regmap configuration sets max_register to 0x10000 although the 64KB mapping ends at 0xfffc, causing a read of an unmapped page while the regmap lock is held. Access to the PHY's regmap debugfs registers is required; triggering the read causes a kernel oops and blocks subsequent PHY operations.
Summary
What happened
Denial of service in Linux kernel 6.15 allows local users to deadlock Rockchip Samsung D/C-PHY operations via a debugfs register dump. The driver's regmap configuration sets max_register to 0x10000 although the 64KB mapping ends at 0xfffc, causing a read of an unmapped page while the regmap lock is held. Access to the PHY's regmap debugfs registers is required; triggering the read causes a kernel oops and blocks subsequent PHY operations.
The record
- CVE
- CVE-2026-89721
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=6.15
- Affected versionversion=b2a1a2ae7818c9d8da12bf7b1983c8b9f5fb712b <14afe18655c0951f4f85898f761bf92264e65ccd
- Affected versionversion=b2a1a2ae7818c9d8da12bf7b1983c8b9f5fb712b <4486e75ba647bd8b98fc1f053101b40caceeed4b
- Affected versionversion=b2a1a2ae7818c9d8da12bf7b1983c8b9f5fb712b <c1a62f9dcf531d56c56da2e4435386b6d264c69f
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What is affected?
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Attacks
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Technologies
Your stack
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Your stack
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