Medium [CVE-2026-89587] Linux kernel: Stack buffer overflow in ACPI pfr_update can lead to memory corruption.
This medium-severity Red Hat Linux advisory covers CVE-2026-89587.
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Summary
A flaw was found in the Linux kernel's ACPI Platform Firmware Runtime Update (pfr_update) component. The `query_capability()` function, responsible for handling ACPI buffer objects from firmware, performs an unchecked memory copy operation.
If the firmware provides an oversized buffer, a stack buffer overflow occurs, leading to memory corruption. This could allow a local attacker to cause a denial of service or potentially execute arbitrary code.
Red Hat severity: Moderate — CVSS 5.7 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H). Weakness: CWE-120.
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 26 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 26 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 26 minutes ago·verify at source
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