Bug 2401503 (CVE-2023-53572)

Summary: CVE-2023-53572 kernel: clk: imx: scu: use _safe list iterator to avoid a use after free
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
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 use-after-free flaw was found in the Linux kernel's i.MX system control unit clock driver in the error cleanup path. A local user can trigger this issue during clock initialization failure scenarios on i.MX hardware with System Control Unit firmware, where the cleanup loop incorrectly uses a standard list iterator instead of the safe variant while freeing clock structures. This causes the kernel to dereference freed memory when traversing to the next list element, resulting in memory corruption that can lead to a crash or denial of service.
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Description OSIDB Bzimport 2025-10-04 16:04:20 UTC 
In the Linux kernel, the following vulnerability has been resolved:

clk: imx: scu: use _safe list iterator to avoid a use after free

This loop is freeing "clk" so it needs to use list_for_each_entry_safe().
Otherwise it dereferences a freed variable to get the next item on the
loop.
Comment 1 Alexander B 2025-10-06 15:03:52 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100453-CVE-2023-53572-ab85@gregkh/T