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PatchSiren cyber security CVE debrief

CVE-2026-64169 Linux CVE debrief

The Linux kernel was vulnerable to an error pointer dereference issue in the spi: ep93xx driver. The driver would fall back to PIO mode if DMA setup failed during probe, but failed to clear DMA channel pointers, potentially leading to errors on later probe attempts or driver unbind. The issue was resolved by ensuring DMA channel pointers are cleared in case of setup failure. This vulnerability affects Linux kernel users and administrators, particularly those using the ep93xx SPI driver. They should verify their systems for potential issues and ensure they are running the latest kernel version. The vulnerability has a medium defensive priority.

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-19
Original CVE updated
2026-07-19
Advisory published
2026-07-19
Advisory updated
2026-07-19

Who should care

Linux kernel users and administrators, particularly those using the ep93xx SPI driver, should verify their systems for potential issues and ensure they are running the latest kernel version. They should review system configurations for spi: ep93xx driver usage, monitor system logs for potential errors related to the ep93xx SPI driver, and perform a thorough review of the system's asset inventory.

Technical summary

In the Linux kernel, the spi: ep93xx driver had a vulnerability where it would not clear DMA channel pointers on DMA setup failure during probe. This could lead to error pointer dereferences on subsequent probe errors or driver unbind operations. The issue was resolved by ensuring DMA channel pointers are cleared in case of setup failure. The vulnerability has a medium defensive priority. Linux kernel users and administrators, particularly those using the ep93xx SPI driver, should verify their systems for potential issues and ensure they are running the latest kernel version.

Defensive priority

Medium

Recommended defensive actions

  • Verify and update Linux kernel to the latest version
  • Review system configurations for spi: ep93xx driver usage
  • Monitor system logs for potential errors related to the ep93xx SPI driver
  • Perform a thorough review of the system's asset inventory
  • Implement compensating controls for exposed systems while remediation is scheduled and verified
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-19T16:17:59.060Z and has not been modified since then. The NVD entry is currently Received. The Linux kernel was vulnerable to an error pointer dereference issue in the spi: ep93xx driver. The driver would fall back to PIO mode if DMA setup failed during probe, but failed to clear DMA channel pointers, potentially leading to errors on later probe attempts or driver unbind. The issue was resolved by ensuring DMA channel pointers are cleared in case of setup failure. To verify, defenders should review system configurations for spi: ep93xx driver usage, monitor system logs for potential errors related to the ep93xx SPI driver, and ensure they are running the latest kernel version.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-19T16:17:59.060Z and has not been modified since then.