CVE-2026-89721
Low risk· EPSS 10%Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel, the phy: rockchip-samsung-dcphy driver has an incorrect max_register value of 0x10000, while the PHY register block is 64KB, so the last accessible register is at offset 0xfffc. Dumping registers through the regmap debugfs interface reads beyond the ioremapped region and oopses on the unmapped page.
Risk Assessment
The oops fires with the regmap lock held, leading to deadlock of later PHY operations, causing a denial of service.
Recommendation
Update the Linux kernel to a version containing the fix that sets the correct max_register value.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: phy: rockchip-samsung-dcphy: fix out-of-range max_register The PHY register block is 64KB, so with a register stride of 4 the last accessible register sits at offset 0xfffc. max_register names 0x10000, one register past the end of the mapping: dumping the registers through the regmap debugfs interface reads beyond the ioremapped region and oopses on the unmapped page. The oops fires with the regmap lock held, so later PHY operations deadlock.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS