Bug 2355472 (CVE-2023-52984)

Summary: CVE-2023-52984 kernel: net: phy: dp83822: Fix null pointer access on DP83825/DP83826 devices
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the dp83822 module in the Linux kernel. A private data pointer is only initialized by the DP83822 PHY. It is left uninitialized by other smaller models, allowing a NULL pointer dereference to be triggered due to missing checks when interrupts are being configured, causing a crash and resulting in a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2025-03-27 17:03:17 UTC 
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.
Comment 1 Robb Gatica 2025-03-27 23:16:07 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025032707-CVE-2023-52984-19ad@gregkh/T