Bug 2516825 (CVE-2026-74352)

Summary: CVE-2026-74352 kernel: of: reserved_mem: avoid post-init UAF when alloc_reserved_mem_array() fails
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's reserved memory management. During initialization, if the allocation of the reserved memory array fails, a global pointer may still reference the freed memory. A subsequent operation, such as looking up reserved memory, could then attempt to access this freed memory, leading to a use-after-free vulnerability. This could result in system instability or a denial of service.
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Description OSIDB Bzimport 2026-08-15 06:35:27 UTC 
In the Linux kernel, the following vulnerability has been resolved:

of: reserved_mem: avoid post-init UAF when alloc_reserved_mem_array() fails

The global pointer 'reserved_mem' continues to reference the
reserved_mem_array which lives in __initdata if
alloc_reserved_mem_array() fails. of_reserved_mem_lookup() is
exported for post-init use, that would dereference freed memory
and trigger a use-after-free.

So reset reserved_mem_count to 0 when alloc_reserved_mem_array()
fails.
Comment 1 Keith Grant 2026-08-20 18:46:48 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081559-CVE-2026-74352-fec6@gregkh/T