Bug 2400634 (CVE-2025-39920)

Summary: CVE-2025-39920 kernel: pcmcia: Add error handling for add_interval() in do_validate_mem()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-10-01 09:01:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

pcmcia: Add error handling for add_interval() in do_validate_mem()

In the do_validate_mem(), the call to add_interval() does not
handle errors. If kmalloc() fails in add_interval(), it could
result in a null pointer being inserted into the linked list,
leading to illegal memory access when sub_interval() is called
next.

This patch adds an error handling for the add_interval(). If
add_interval() returns an error, the function will return early
with the error code.
Comment 1 Alexander B 2025-10-02 11:53:03 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100120-CVE-2025-39920-5dbe@gregkh/T