In the Linux kernel, the following vulnerability has been resolved: trace/fgraph: Fix the...
🔗 CVE IDs covered (1)
📋 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.
🔗 References (7)
- https://nvd.nist.gov/vuln/detail/CVE-2025-39829
- https://git.kernel.org/stable/c/000aa47a51233fd38a629b029478e0278e1e9fbe
- https://git.kernel.org/stable/c/2a2deb9f8df70480050351ac27041f19bb9e718b
- https://git.kernel.org/stable/c/edede7a6dcd7435395cf757d053974aaab6ab1c2
- https://git.kernel.org/stable/c/aa977309397fe2438801b1ca1ce7bc4106d8e985
- https://git.kernel.org/stable/c/3cfa337c1adceda1632aefee4c3562440446ce51
- https://github.com/advisories/GHSA-qgx7-pghq-36xv