Medium [CVE-2026-68424] fix use-after-free in mtd_virt_concat_destroy_joins
This medium-severity Red Hat Linux advisory covers CVE-2026-68424.
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Summary
In the Linux kernel, the following vulnerability has been resolved: mtd: virt_concat: fix use-after-free in mtd_virt_concat_destroy_joins() mtd_concat_destroy() frees item->concat so calling mtd_virt_concat_put_mtd_devices(item->concat) leads to a use after free. A flaw was found in the Linux kernel's `mtd_virt_concat` module.
This use-after-free vulnerability occurs when the `mtd_concat_destroy()` function frees memory before it is no longer referenced by `mtd_virt_concat_put_mtd_devices()`. An attacker could potentially exploit this flaw to cause memory corruption, which may lead to a denial of service or other impacts on system stability.
This issue affects virtual MTD concat join devices. Same UAF pattern as CVE-2026-68423 in destroy_joins path.
Systems not using virt_concat MTD are not affected. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-825. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux for NVIDIA 26; Red Hat OpenShift Container Platform 4 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 2 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 2 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 2 days ago·verify at source
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