In the Linux kernel, the following vulnerability has been resolved: spi: qup: fix error pointer deref after DMA setup failure The driver falls back… (CVE-2026-64170)
A vulnerability in the Linux kernel's spi qup driver could lead to a null pointer dereference after a DMA setup failure. The driver attempts to fall back to PIO mode if DMA setup fails, but does not clear DMA channel pointers properly, which may cause dereferencing of error pointers or double release of channels during later probe errors or driver unbind. This issue has been resolved in the Linux kernel.
AI Analysis
Technical Summary
The Linux kernel spi qup driver contained a flaw where, upon DMA setup failure during probe, the driver falls back to PIO mode but fails to clear DMA channel pointers. This can result in dereferencing error pointers or attempting to release a DMA channel twice during subsequent probe errors or driver unbind operations. The issue was identified during a review of a devres allocation conversion patch and has been fixed to clear DMA channel pointers on setup failure, preventing null pointer dereference (CWE-476).
Potential Impact
The vulnerability can cause a denial of service (system crash) due to null pointer dereference, impacting system availability. There is no indication of confidentiality or integrity impact. Exploitation requires local access with low privileges and no user interaction is needed.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to clear DMA channel pointers on setup failure, preventing error pointer dereference. Users should update to the fixed Linux kernel version containing this patch. Patch status is not explicitly confirmed in the provided data; check the official Linux kernel advisories or vendor updates for the exact fixed versions and apply updates accordingly.
In the Linux kernel, the following vulnerability has been resolved: spi: qup: fix error pointer deref after DMA setup failure The driver falls back… (CVE-2026-64170)
Description
A vulnerability in the Linux kernel's spi qup driver could lead to a null pointer dereference after a DMA setup failure. The driver attempts to fall back to PIO mode if DMA setup fails, but does not clear DMA channel pointers properly, which may cause dereferencing of error pointers or double release of channels during later probe errors or driver unbind. This issue has been resolved in the Linux kernel.
CVSS v3.1
Score 5.5medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel spi qup driver contained a flaw where, upon DMA setup failure during probe, the driver falls back to PIO mode but fails to clear DMA channel pointers. This can result in dereferencing error pointers or attempting to release a DMA channel twice during subsequent probe errors or driver unbind operations. The issue was identified during a review of a devres allocation conversion patch and has been fixed to clear DMA channel pointers on setup failure, preventing null pointer dereference (CWE-476).
Potential Impact
The vulnerability can cause a denial of service (system crash) due to null pointer dereference, impacting system availability. There is no indication of confidentiality or integrity impact. Exploitation requires local access with low privileges and no user interaction is needed.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to clear DMA channel pointers on setup failure, preventing error pointer dereference. Users should update to the fixed Linux kernel version containing this patch. Patch status is not explicitly confirmed in the provided data; check the official Linux kernel advisories or vendor updates for the exact fixed versions and apply updates accordingly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-m682-4gwr-mr4j
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64170"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27a82a4a8d598912a220
Added to database: 07/19/2026, 19:38:16 UTC
Last enriched: 08/13/2026, 19:12:18 UTC
Last updated: 09/03/2026, 10:52:10 UTC
Views: 65
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