CVE-2025-39829

Summary

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: <TASK> 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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/000aa47a51233fd38a629b029478e0278e1e9fbe ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/000aa47a51233fd38a629b029478e0278e1e9fbePatch
• https://git.kernel.org/stable/c/2a2deb9f8df70480050351ac27041f19bb9e718bPatch
• https://git.kernel.org/stable/c/edede7a6dcd7435395cf757d053974aaab6ab1c2Patch
• https://git.kernel.org/stable/c/3cfa337c1adceda1632aefee4c3562440446ce51
• https://git.kernel.org/stable/c/aa977309397fe2438801b1ca1ce7bc4106d8e985