Linux Kernel: HIDP Session Thread Race Use-After-Free (CVE-2023-54120)
CVE-2023-54120 Published on December 24, 2025
Bluetooth: Fix race condition in hidp_session_thread
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
Products Associated with CVE-2023-54120
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 152f47bd6b995e0e98c85672f6d19894bc287ef2 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 5f3d214d19899183d4e0cce7552998262112e4ab is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 8a99e6200c38b78a45dcd12a6bdc43fdf4dc36be is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below f7ec5ca433ceead8d9d78fd2febff094f289441d is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 0efb276d5848a3accc37c6f41b85e442c4768169 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below f6719fd8f409fa1da8dc956e93822d25e1e8b360 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 248af9feca062a4ca9c3f2ccf67056c8a5eb817f is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below c95930abd687fcd1aa040dc4fe90dff947916460 is affected.
- Version 2.6.12 is affected.
- Before 2.6.12 is unaffected.
- Version 4.14.313, <= 4.14.* is unaffected.
- Version 4.19.281, <= 4.19.* is unaffected.
- Version 5.4.241, <= 5.4.* is unaffected.
- Version 5.10.178, <= 5.10.* is unaffected.
- Version 5.15.108, <= 5.15.* is unaffected.
- Version 6.1.25, <= 6.1.* is unaffected.
- Version 6.2.12, <= 6.2.* is unaffected.
- Version 6.3, <= * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.