Bug 2373594 (CVE-2022-50007)

Summary: CVE-2022-50007 kernel: xfrm: fix refcount leak in __xfrm_policy_check()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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A flaw was found in the XFRM subsystem in the Linux kernel. A missing decrement of the reference count when an error occurs will cause a memory leak, potentially impacting system performance and resulting in a denial of service.
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Description OSIDB Bzimport 2025-06-18 12:09:50 UTC 
In the Linux kernel, the following vulnerability has been resolved:

xfrm: fix refcount leak in __xfrm_policy_check()

The issue happens on an error path in __xfrm_policy_check(). When the
fetching process of the object `pols[1]` fails, the function simply
returns 0, forgetting to decrement the reference count of `pols[0]`,
which is incremented earlier by either xfrm_sk_policy_lookup() or
xfrm_policy_lookup(). This may result in memory leaks.

Fix it by decreasing the reference count of `pols[0]` in that path.
Comment 1 Avinash Hanwate 2025-06-19 07:02:06 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025061830-CVE-2022-50007-95d2@gregkh/T