CVE-2023-52984: net: phy: dp83822: Fix null pointer access on DP83825/DP83826 devices

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-03-27 · updated 2026-06-17
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: net: phy: dp83822: Fix null pointer access on DP83825/DP83826 devices The probe() function is only used for the DP83822 PHY, leaving the private data pointer uninitialized for the smaller DP83825/26 models. While all uses of the private data structure are hidden in 82822 specific callbacks, configuring the interrupt is shared across all models. This causes a NULL pointer dereference on the smaller PHYs as it accesses the private data unchecked. Verifying the pointer avoids that.

Affected products

Linux kernel: from 5.10 before 5.10.168; from 5.11 before 5.15.93; from 5.16 before 6.1.11; 6.2-rc1, 6.2-rc2, 6.2-rc3, 6.2-rc4, 6.2-rc5, 6.2-rc6 — fixed in 5.10.168, 5.15.93, 6.1.11

How to fix

Upgrade to a fixed version: Linux kernel 5.10.168, 5.15.93, 6.1.11. Check the vendor advisory for mitigations.

References

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