CVE-2025-39829 - trace/fgraph: Fix the warning caused by missing unregister notifier

CVE-2025-39829 - trace/fgraph: Fix the warning caused by missing unregister notifier

https://cvefeed.io/rssfeed/latest.atom / Tue, 09/16/2025 - 17:39
CVE ID : CVE-2025-39829
Published : Sept. 16, 2025, 1 p.m. | 1 hour, 15 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: trace/fgraph: Fix the warning caused by missing unregister notifier This warning was triggered during testing on v6.16: notifier callback ftrace_suspend_notifier_call already registered WARNING: CPU: 2 PID: 86 at kernel/notifier.c:23 notifier_chain_register+0x44/0xb0 ... Call Trace: blocking_notifier_chain_register+0x34/0x60 register_ftrace_graph+0x330/0x410 ftrace_profile_write+0x1e9/0x340 vfs_write+0xf8/0x420 ? filp_flush+0x8a/0xa0 ? filp_close+0x1f/0x30 ? do_dup2+0xaf/0x160 ksys_write+0x65/0xe0 do_syscall_64+0xa4/0x260 entry_SYSCALL_64_after_hwframe+0x77/0x7f When writing to the function_profile_enabled interface, the notifier was not unregistered after start_graph_tracing failed, causing a warning the next time function_profile_enabled was written. Fixed by adding unregister_pm_notifier in the exception path.
Severity: 0.0 | NA
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