Bug 2454841 (CVE-2026-23464)

Summary: CVE-2026-23464 kernel: soc: microchip: mpfs: Fix memory leak in mpfs_sys_controller_probe()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel, specifically within the Microchip PolarFire SoC (System-on-Chip) system controller driver. When the `mpfs_sys_controller_probe()` function fails to initialize a device, it does not properly release allocated memory. This memory leak can accumulate over time, potentially leading to system instability or a denial of service (DoS) condition, where legitimate system operations are disrupted.
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Description OSIDB Bzimport 2026-04-03 16:03:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

soc: microchip: mpfs: Fix memory leak in mpfs_sys_controller_probe()

In mpfs_sys_controller_probe(), if of_get_mtd_device_by_node() fails,
the function returns immediately without freeing the allocated memory
for sys_controller, leading to a memory leak.

Fix this by jumping to the out_free label to ensure the memory is
properly freed.

Also, consolidate the error handling for the mbox_request_channel()
failure case to use the same label.
Comment 1 Jon Moroney 2026-04-03 18:06:00 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026040320-CVE-2026-23464-840f@gregkh/T