Medium [CVE-2026-89559] Linux kernel: Out-of-bounds write in libnvdimm/labels due to integer overflow
This medium-severity Red Hat Linux advisory covers CVE-2026-89559.
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Summary
A flaw was found in the Linux kernel's `libnvdimm/labels` component. An integer overflow vulnerability exists in the `__nd_label_validate()` function, where a 32-bit calculation of a namespace index field (`nslot`) can wrap around.
This allows a local attacker, or an attacker with control over the storage medium, to provide a specially crafted `nslot` value. This crafted value can bypass security checks, leading to an out-of-bounds write and potential memory corruption.
Red Hat severity: Moderate — CVSS 6 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:H/A:H). Weakness: CWE-787.
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 18 minutes 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 18 minutes 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 18 minutes ago·verify at source
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