Linux kernel MTD virt_concat UAF in destroy()
CVE-2026-68423 Published on August 10, 2026
mtd: virt_concat: fix use-after-free in mtd_virt_concat_destroy()
In the Linux kernel, the following vulnerability has been resolved:
mtd: virt_concat: fix use-after-free in mtd_virt_concat_destroy()
mtd_concat_destroy() frees item->concat so calling
mtd_virt_concat_put_mtd_devices(item->concat) after that leads to a
use-after-free.
Fix it by moving mtd_virt_concat_put_mtd_devices() before
mtd_concat_destroy().
Products Associated with CVE-2026-68423
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Affected Versions
Linux:- Version 43db6366fc2de02050e66389f5628d3fdc9af10a and below d36520e5da8bf87265b334def0daaadf3603cc62 is affected.
- Version 43db6366fc2de02050e66389f5628d3fdc9af10a and below 4b45d7836b9526b8776af5f29219615be9417230 is affected.
- Version 7.1 is affected.
- Before 7.1 is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc4, <= * is unaffected.