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CVE-2023-53746: s390/vfio-ap: fix memory leak in vfio_ap device driver

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-08 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: s390/vfio-ap: fix memory leak in vfio_ap device driver The device release callback function invoked to release the matrix device uses the dev_get_drvdata(device *dev) function to retrieve the pointer to the vfio_matrix_dev object in order to free its storage. The problem is, this object is not stored as drvdata with the device; since the kfree function will accept a NULL pointer, the memory for the vfio_matrix_dev object is never freed. Since the device being released is contained within the vfio_matrix_dev object, the container_of macro will be used to retrieve its pointer.

Affected products

• Linux kernel: 4.20 — fixed in 6.3

How to fix

Upgrade to a fixed version: Linux kernel 6.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/5195de1d5f66b276683240a896783f7f43c4f664
• https://git.kernel.org/stable/c/6a40fda14b4be3e38f03cc42ffd4efbc64fb3e67
• https://git.kernel.org/stable/c/7b6a02f5bf15931464c79dfd487c57f76aae3496
• https://git.kernel.org/stable/c/8f8cf767589f2131ae5d40f3758429095c701c84
• https://git.kernel.org/stable/c/aa2bff25e9bb10c935c7ffe3d5f5975bdccb1749
• https://git.kernel.org/stable/c/ee17dea3072dec0bc34399a32fa884e26342e4ea

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