CVE-2023-54120
Unknown Unknown - Not Provided
Use-After-Free Race Condition in Linux Kernel Bluetooth HIDP Component

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Fix race condition in hidp_session_thread There is a potential race condition in hidp_session_thread that may lead to use-after-free. For instance, the timer is active while hidp_del_timer is called in hidp_session_thread(). After hidp_session_put, then 'session' will be freed, causing kernel panic when hidp_idle_timeout is running. The solution is to use del_timer_sync instead of del_timer. Here is the call trace: ? hidp_session_probe+0x780/0x780 call_timer_fn+0x2d/0x1e0 __run_timers.part.0+0x569/0x940 hidp_session_probe+0x780/0x780 call_timer_fn+0x1e0/0x1e0 ktime_get+0x5c/0xf0 lapic_next_deadline+0x2c/0x40 clockevents_program_event+0x205/0x320 run_timer_softirq+0xa9/0x1b0 __do_softirq+0x1b9/0x641 __irq_exit_rcu+0xdc/0x190 irq_exit_rcu+0xe/0x20 sysvec_apic_timer_interrupt+0xa1/0xc0
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Meta Information
Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-05-07
AI Q&A
2025-12-24
EPSS Evaluated
2026-05-05
NVD
CVE-2023-54120
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a race condition in the Linux kernel's Bluetooth component, specifically in the hidp_session_thread. The issue arises because a timer remains active while the hidp_del_timer function is called, and after the session is released (hidp_session_put), the session object may be freed. If the timer callback (hidp_idle_timeout) runs after the session is freed, it can cause a kernel panic due to use-after-free. The fix involves using del_timer_sync instead of del_timer to properly synchronize timer deletion.


How can this vulnerability impact me? :

This vulnerability can lead to a kernel panic, which causes the system to crash. This can result in denial of service, potentially disrupting operations on affected Linux systems using Bluetooth HID protocols.


What immediate steps should I take to mitigate this vulnerability?

The vulnerability is fixed by updating the Linux kernel to a version where the race condition in hidp_session_thread is resolved by using del_timer_sync instead of del_timer. Therefore, the immediate step is to update your Linux kernel to the patched version that includes this fix.


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