SB2026072037 - NULL pointer dereference in Linux kernel spi driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-64169)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper handling of error pointers in the ep93xx SPI driver DMA channel setup logic when handling DMA setup failures during device probe or later driver cleanup paths. A local user can trigger DMA setup failure conditions to cause a denial of service.

The driver may later dereference an error pointer during subsequent probe error handling or driver unbind after falling back to PIO mode.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0e2189ab095e3657f37b8295f3f2bbcde0f27529
• https://git.kernel.org/stable/c/5e121a81667a83e9a01d62b429e340f5a4a84abc
• https://git.kernel.org/stable/c/8e027db9fa310b1d5e7ad928510be800c4f004d9
• https://git.kernel.org/stable/c/b6c0dabea07e25bd7db19a77ebfd0d02b9e2671a