Medium [CVE-2026-64170] fix error pointer deref after DMA setup failure
This medium-severity Red Hat Linux advisory covers CVE-2026-64170 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
In the Linux kernel, the following vulnerability has been resolved: spi: qup: fix error pointer deref after DMA setup failure The driver falls back to PIO mode if DMA setup fails during probe.
Make sure to the clear the DMA channel pointers on setup failure to avoid dereferencing an error pointer (or attempting to release a channel a second time) on later probe errors or driver unbind. This issue was flagged by Sashiko when reviewing a devres allocation conversion patch.
A flaw was found in the Linux kernel's Serial Peripheral Interface (SPI) Qualcomm Universal Peripheral (QUP) driver. When the Direct Memory Access (DMA) setup fails during the driver's initialization, the driver attempts to fall back to Programmed Input/Output (PIO) mode.
However, it fails to properly clear the DMA channel pointers, which could lead to dereferencing an invalid memory address. This could result in system instability or a denial of service, making the system unresponsive to legitimate requests.
This vulnerability is rated as Moderate severity because exploitation requires local access, specific Qualcomm hardware, and an initial DMA initialization failure during driver probe to trigger a denial of service (system crash).
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat package: kernel-rt.
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 6 days 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 6 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 6 days ago·verify at source
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