Bug 2425132 (CVE-2023-54097)

Summary: CVE-2023-54097 kernel: Linux kernel: Memory leak in stm32-pwr regulator driver can lead to denial of service
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `stm32-pwr` regulator driver. This vulnerability, a memory leak, occurs when a specific memory resource is not properly released if certain operations fail during the probe function. A local attacker could potentially exploit this to consume system memory, which may lead to a denial of service (DoS).
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Description OSIDB Bzimport 2025-12-24 14:05:18 UTC 
In the Linux kernel, the following vulnerability has been resolved:

regulator: stm32-pwr: fix of_iomap leak

Smatch reports:
drivers/regulator/stm32-pwr.c:166 stm32_pwr_regulator_probe() warn:
'base' from of_iomap() not released on lines: 151,166.

In stm32_pwr_regulator_probe(), base is not released
when devm_kzalloc() fails to allocate memory or
devm_regulator_register() fails to register a new regulator device,
which may cause a leak.

To fix this issue, replace of_iomap() with
devm_platform_ioremap_resource(). devm_platform_ioremap_resource()
is a specialized function for platform devices.
It allows 'base' to be automatically released whether the probe
function succeeds or fails.

Besides, use IS_ERR(base) instead of !base
as the return value of devm_platform_ioremap_resource()
can either be a pointer to the remapped memory or
an ERR_PTR() encoded error code if the operation fails.
Comment 1 Alexander B 2025-12-25 00:06:00 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122409-CVE-2023-54097-3fb1@gregkh/T