Bug 2348907 (CVE-2025-21822)

Summary: CVE-2025-21822 kernel: ptp: vmclock: Set driver data before its usage
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-27 21:02:45 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ptp: vmclock: Set driver data before its usage

If vmclock_ptp_register() fails during probing, vmclock_remove() is
called to clean up the ptp clock and misc device.
It uses dev_get_drvdata() to access the vmclock state.
However the driver data is not yet set at this point.

Assign the driver data earlier.
Comment 1 Avinash Hanwate 2025-02-28 04:57:13 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022707-CVE-2025-21822-88c0@gregkh/T