Bug 2420360 (CVE-2022-50663)

Summary: CVE-2022-50663 kernel: net: stmmac: fix possible memory leak in stmmac_dvr_probe()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A memory leak vulnerability was found in the stmmac network driver in the Linux kernel. When create_singlethread_workqueue() fails during probe, the previously allocated bitmap (priv->af_xdp_zc_qps) is not freed. This can lead to memory resource exhaustion if the error condition is repeatedly triggered.
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Description OSIDB Bzimport 2025-12-09 02:05:35 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: stmmac: fix possible memory leak in stmmac_dvr_probe()

The bitmap_free() should be called to free priv->af_xdp_zc_qps
when create_singlethread_workqueue() fails, otherwise there will
be a memory leak, so we add the err path error_wq_init to fix it.
Comment 1 Alexander B 2025-12-09 17:01:53 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120943-CVE-2022-50663-5606@gregkh/T