High [CVE-2026-89481] Linux kernel (nvme-tcp): Host memory disclosure
This high-severity Red Hat Linux advisory covers CVE-2026-89481.
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Summary
A flaw was found in the Linux kernel's NVMe (Non-Volatile Memory Express) over TCP (nvme-tcp) component. A malicious NVMe controller can exploit this vulnerability by sending a Ready to Transfer (R2T) command for a read request.
The host system, failing to properly validate the request direction, will then send the contents of its read destination buffer to the controller. This can lead to the disclosure of stale kernel memory data, potentially revealing sensitive information.
Red Hat severity: Moderate — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H). Weakness: CWE-201.
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 36 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 36 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 36 minutes ago·verify at source
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