Bug 2486440 (CVE-2026-46308)

Summary: CVE-2026-46308 kernel: pmdomain: mediatek: fix use-after-free in scpsys_get_bus_protection_legacy()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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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, specifically within the pmdomain: mediatek component. An issue in the scpsys_get_bus_protection_legacy() function's error handling could lead to a use-after-free vulnerability. This occurs when memory is prematurely released before error checks are completed, which can result in system instability or a denial of service.
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Description OSIDB Bzimport 2026-06-08 17:01:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

pmdomain: mediatek: fix use-after-free in scpsys_get_bus_protection_legacy()

In scpsys_get_bus_protection_legacy(), of_find_node_with_property()
returns a device node with its reference count incremented. The function
then calls of_node_put(node) before checking whether
syscon_regmap_lookup_by_phandle() returns an error. If an error occurs,
dev_err_probe() dereferences the node pointer to print diagnostic
information, but the node memory may have already been freed due to the
earlier of_node_put(), leading to a use-after-free vulnerability.

Fix this by moving the of_node_put() call after the error check, ensuring
the node is still valid when accessed in the error path.
Comment 1 Keith Grant 2026-06-08 18:28:22 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026060801-CVE-2026-46308-d902@gregkh/T