Bug 2356597 (CVE-2025-21950)

Summary: CVE-2025-21950 kernel: drivers: virt: acrn: hsm: Use kzalloc to avoid info leak in pmcmd_ioctl
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-04-01 16:01:43 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drivers: virt: acrn: hsm: Use kzalloc to avoid info leak in pmcmd_ioctl

In the "pmcmd_ioctl" function, three memory objects allocated by
kmalloc are initialized by "hcall_get_cpu_state", which are then
copied to user space. The initializer is indeed implemented in
"acrn_hypercall2" (arch/x86/include/asm/acrn.h). There is a risk of
information leakage due to uninitialized bytes.
Comment 1 Robb Gatica 2025-04-02 04:54:14 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025040136-CVE-2025-21950-11d2@gregkh/T