Bug 2513229 (CVE-2026-68423)

Summary: CVE-2026-68423 kernel: mtd: virt_concat: fix use-after-free in mtd_virt_concat_destroy()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
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's `mtd: virt_concat` subsystem. The `mtd_virt_concat_destroy()` function incorrectly calls `mtd_virt_concat_put_mtd_devices()` after `mtd_concat_destroy()` has already freed the associated memory. This use-after-free vulnerability can lead to system instability or potentially enable a local attacker to achieve privilege escalation or arbitrary code execution.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-08-10 12:26:02 UTC 
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().