Medium [CVE-2026-89575] Linux kernel: Buffer overflow in dm-raid1 due to missing NUL-terminator
This medium-severity Red Hat Linux advisory covers CVE-2026-89575.
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Summary
A flaw was found in the Linux kernel's device mapper (dm-raid1) component. This vulnerability occurs in the `build_constructor_string()` function, where insufficient space is reserved for a NUL-terminator when formatting a string with `sprintf()`.
This oversight can lead to a buffer overflow, potentially allowing an attacker to cause a denial of service or execute arbitrary code. Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H).
Weakness: CWE-170.
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 56 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 56 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 56 minutes ago·verify at source
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