Medium [CVE-2026-89745] Debugfs lockdown bypass due to incomplete mmap_prepare check
This medium-severity Red Hat Linux advisory covers CVE-2026-89745.
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Summary
A flaw was found in the Linux kernel's debugfs component. The lockdown mechanism, designed to enhance system integrity, did not properly account for files using the `mmap_prepare` operation.
This oversight could allow an attacker to bypass kernel lockdown restrictions when the system is operating in integrity mode, potentially compromising system integrity. Red Hat severity: Moderate — CVSS 4.4 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N).
Weakness: CWE-414.
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 46 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 46 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 46 minutes ago·verify at source
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