Bug 2486469 (CVE-2026-46288)

Summary: CVE-2026-46288 kernel: of: unittest: fix use-after-free in of_unittest_changeset()
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
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel. This vulnerability, a use-after-free (UAF), occurs within the `of_unittest_changeset()` function due to improper handling of device node references. An attacker could exploit this by causing a device node's memory to be freed while it is still in use. This could lead to a system crash, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-06-08 17:03:39 UTC 
In the Linux kernel, the following vulnerability has been resolved:

of: unittest: fix use-after-free in of_unittest_changeset()

The variable 'parent' is assigned the value of 'nchangeset' earlier in the
function, meaning both point to the same struct device_node. The call to
of_node_put(nchangeset) can decrement the reference count to zero and
free the node if there are no other holders. After that, the code still
uses 'parent' to check for the presence of a property and to read a
string property, leading to a use-after-free.

Fix this by moving the of_node_put() call after the last access to
'parent', avoiding the UAF.
Comment 1 Keith Grant 2026-06-08 19:35:51 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026060844-CVE-2026-46288-76f3@gregkh/T