What’s Vulnerable › Vulnerabilities

CVE-2025-68173: ftrace: Fix softlockup in ftrace_module_enable

• Severity: unknown
• 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: 2025-12-16 · updated 2026-10-14

Description

In the Linux kernel, the following vulnerability has been resolved: ftrace: Fix softlockup in ftrace_module_enable A soft lockup was observed when loading amdgpu module. If a module has a lot of tracable functions, multiple calls to kallsyms_lookup can spend too much time in RCU critical section and with disabled preemption, causing kernel panic. This is the same issue that was fixed in commit d0b24b4e91fc ("ftrace: Prevent RCU stall on PREEMPT_VOLUNTARY kernels") and commit 42ea22e754ba ("ftrace: Add cond_resched() to ftrace_graph_set_hash()"). Fix it the same way by adding cond_resched() in ftrace_module_enable.

Affected products

• Linux kernel: 4.5 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4099b98203d6b33d990586542fa5beee408032a3
• https://git.kernel.org/stable/c/40c8ee40e48a2c82c762539952ed8fc0571db5bf
• https://git.kernel.org/stable/c/7e3c96010ade29bb340a5bdce8675f50c7f59001
• https://git.kernel.org/stable/c/a1dd0abd741a8111260676da729825d6c1461a71
• https://git.kernel.org/stable/c/e81e6d6d99b16dae11adbeda5c996317942a940c

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