Medium [CVE-2026-89456] Linux kernel: Information disclosure in s390/dasd via incorrect data tracking
This medium-severity Red Hat Linux advisory covers CVE-2026-89456.
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Summary
A flaw was found in the Linux kernel. Specifically, within the s390/dasd component, an issue exists during error recovery for disk read operations.
When a request is partially completed and then recovered, the system fails to correctly propagate the length of the processed data. This can lead to the kernel silently returning zeroed data for the unread portion of a request, potentially resulting in information disclosure to a local attacker.
Red Hat severity: Moderate — CVSS 5.2 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H). Weakness: CWE-908.
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 hours 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 hours 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 hours ago·verify at source
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