Bug 2422723 (CVE-2025-68212)

Summary: CVE-2025-68212 kernel: fs: Fix uninitialized 'offp' in statmount_string()
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 2025-12-16 14:06:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

fs: Fix uninitialized 'offp' in statmount_string()

In statmount_string(), most flags assign an output offset pointer (offp)
which is later updated with the string offset. However, the
STATMOUNT_MNT_UIDMAP and STATMOUNT_MNT_GIDMAP cases directly set the
struct fields instead of using offp. This leaves offp uninitialized,
leading to a possible uninitialized dereference when *offp is updated.

Fix it by assigning offp for UIDMAP and GIDMAP as well, keeping the code
path consistent.
Comment 1 Alexander B 2025-12-17 00:28:55 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121630-CVE-2025-68212-eab7@gregkh/T