CVE-2025-37940: ftrace: Add cond_resched() to ftrace_graph_set_hash()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-20 · updated 2026-06-17
Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: ftrace: Add cond_resched() to ftrace_graph_set_hash() When the kernel contains a large number of functions that can be traced, the loop in ftrace_graph_set_hash() may take a lot of time to execute. This may trigger the softlockup watchdog. Add cond_resched() within the loop to allow the kernel to remain responsive even when processing a large number of functions. This matches the cond_resched() that is used in other locations of the code that iterates over all functions that can be traced.

Affected products

Debian Linux: 11.0
Linux kernel: from 4.11 before 5.4.293; from 5.5 before 5.10.237; from 5.11 before 5.15.181; from 5.16 before 6.1.135; from 6.2 before 6.6.88; from 6.7 before 6.12.24 — fixed in 5.10.237, 5.15.181, 5.4.293, 6.1.135, 6.12.24, 6.13.12

How to fix

Upgrade to a fixed version: Linux kernel 5.10.237, 5.15.181, 5.4.293, 6.1.135. Check the vendor advisory for mitigations.

References

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