Bug 2486447 (CVE-2026-46285)

Summary: CVE-2026-46285 kernel: mtd: docg3: fix use-after-free in docg3_release()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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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's `mtd: docg3` module. The `docg3_release()` function attempts to access memory that has already been deallocated, leading to a use-after-free vulnerability. This issue could allow a local attacker to cause a denial of service or potentially execute arbitrary code.
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Description OSIDB Bzimport 2026-06-08 17:02:23 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mtd: docg3: fix use-after-free in docg3_release()

In docg3_release(), the docg3 pointer is obtained from
cascade->floors[0]->priv before the loop that calls
doc_release_device() on each floor. doc_release_device() frees the
docg3 struct via kfree(docg3) at line 1881. After the loop,
docg3->cascade->bch dereferences the already-freed pointer.

Fix this by accessing cascade->bch directly, which is equivalent
since docg3->cascade points back to the same cascade struct, and
is already available as a local variable. This also removes the
now-unused docg3 local variable.
Comment 1 Keith Grant 2026-06-08 19:42:21 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026060843-CVE-2026-46285-0239@gregkh/T