In the Linux kernel, the following vulnerability has been resolved: phy: rockchip-samsung-dcphy: fix out-of-range max_register The PHY register… (CVE-2026-89721)
A vulnerability in the Linux kernel's rockchip-samsung-dcphy PHY driver involved an out-of-range max_register value causing out-of-bounds register access. This could lead to a kernel oops and subsequent deadlock due to the regmap lock being held during the fault. The issue has been resolved in the Linux kernel.
AI Analysis
Technical Summary
The Linux kernel's rockchip-samsung-dcphy PHY driver had a max_register value set to 0x10000, which is one register beyond the actual 64KB PHY register block (last valid offset 0xfffc with 4-byte stride). Accessing registers via the regmap debugfs interface could read beyond the ioremapped region, causing a kernel oops. Because the oops occurs while holding the regmap lock, subsequent PHY operations deadlock. This vulnerability has been fixed.
Potential Impact
Exploitation causes a kernel oops (crash) and deadlock in PHY operations due to accessing unmapped memory beyond the register block. This can lead to system instability or denial of service on affected systems.
Mitigation Recommendations
A fix has been applied to the Linux kernel to correct the max_register value and prevent out-of-range register access. Users should update to the fixed kernel version containing this patch. No additional mitigation is required once patched.
In the Linux kernel, the following vulnerability has been resolved: phy: rockchip-samsung-dcphy: fix out-of-range max_register The PHY register… (CVE-2026-89721)
Description
A vulnerability in the Linux kernel's rockchip-samsung-dcphy PHY driver involved an out-of-range max_register value causing out-of-bounds register access. This could lead to a kernel oops and subsequent deadlock due to the regmap lock being held during the fault. The issue has been resolved in the Linux kernel.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's rockchip-samsung-dcphy PHY driver had a max_register value set to 0x10000, which is one register beyond the actual 64KB PHY register block (last valid offset 0xfffc with 4-byte stride). Accessing registers via the regmap debugfs interface could read beyond the ioremapped region, causing a kernel oops. Because the oops occurs while holding the regmap lock, subsequent PHY operations deadlock. This vulnerability has been fixed.
Potential Impact
Exploitation causes a kernel oops (crash) and deadlock in PHY operations due to accessing unmapped memory beyond the register block. This can lead to system instability or denial of service on affected systems.
Mitigation Recommendations
A fix has been applied to the Linux kernel to correct the max_register value and prevent out-of-range register access. Users should update to the fixed kernel version containing this patch. No additional mitigation is required once patched.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-jrrm-mv6f-g3m6
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-89721"]
Threat ID: 6aa49ffc55bf5e2cf5a865e8
Added to database: 09/12/2026, 00:42:36 UTC
Last enriched: 09/12/2026, 00:52:14 UTC
Last updated: 09/12/2026, 00:52:14 UTC
Views: 2
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