TI-2025-26593 Aliases CVE-2025-39921 GHSA-6595-xfjg-wffj

spi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback

LOW 24Published 2025-10-01 · Updated 2026-10-21

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

In the Linux kernel, the following vulnerability has been resolved: spi: microchip-core-qspi: stop checking viability of op->max_freq in supports_op callback In commit 13529647743d9 ("spi: microchip-core-qspi: Support per spi-mem operation frequency switches") the logic for checking the viability of op->max_freq in mchp_coreqspi_setup_clock() was copied into mchp_coreqspi_supports_op(). Unfortunately, op->max_freq is not valid when this function is called during probe but is instead zero. Accordingly, baud_rate_val is calculated to be INT_MAX due to division by zero, causing probe of the attached memory device to fail. Seemingly spi-microchip-core-qspi was the only driver that had such a modification made to its supports_op callback when the per_op_freq capability was added, so just remove it to restore prior functionality.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00187 8th percentileScored 2026-11-07

Fix Fixed Linux (Linux): 6.16.6, 6.17

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Linux	Linux	6.14 and later	6.16.6, 6.17	Patch available	CNA

Linux VendorLinux Affected 6.14 and later Fixed in 6.16.6, 6.17 Patch available CNA

CPE configurations NVD · 5

CPE	Versions	Role	Vendor
cpe:2.3:o:linux:linux_kernel::::::::	6.14 to before 6.16.6	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.17:rc1::::::	6.17 rc1	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.17:rc2::::::	6.17 rc2	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.17:rc3::::::	6.17 rc3	Vulnerable	Linux
cpe:2.3:o:linux:linux_kernel:6.17:rc4::::::	6.17 rc4	Vulnerable	Linux

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.14 to before 6.16.6 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* Versions 6.17 rc1 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* Versions 6.17 rc2 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* Versions 6.17 rc3 Vulnerable ·Linux
cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:* Versions 6.17 rc4 Vulnerable ·Linux

Remediation

Fix · CNA Linux (Linux) Fixed in 6.16.6, 6.17

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 5 products

Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Timeline

2026-10-02 Threatist record created from CVE-2025-39921
2026-10-03 Alias added: GHSA-6595-xfjg-wffj
2026-10-21 Fix available: Linux/Linux@4ad071e3d57967f7ab483aed0687468bc1d9e9ce · CNA
2026-10-21 1 new reference · CNA

References

Patch 2

Other 1

https://git.kernel.org/stable/c/4ad071e3d57967f7ab483aed0687468bc1d9e9ce

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Sources

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