CVE-2025-37875

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

igc: fix PTM cycle trigger logic

Writing to clear the PTM status 'valid' bit while the PTM cycle is

triggered results in unreliable PTM operation. To fix this, clear the

PTM 'trigger' and status after each PTM transaction.

The issue can be reproduced with the following:

$ sudo phc2sys -R 1000 -O 0 -i tsn0 -m

Note: 1000 Hz (-R 1000) is unrealistically large, but provides a way to

quickly reproduce the issue.

PHC2SYS exits with:

"ioctl PTP_OFFSET_PRECISE: Connection timed out" when the PTM transaction

fails

This patch also fixes a hang in igc_probe() when loading the igc

driver in the kdump kernel on systems supporting PTM.

The igc driver running in the base kernel enables PTM trigger in

igc_probe(). Therefore the driver is always in PTM trigger mode,

except in brief periods when manually triggering a PTM cycle.

When a crash occurs, the NIC is reset while PTM trigger is enabled.

Due to a hardware problem, th

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References