Linux Kernel up to 6.2.11 hidp_session_thread use after free

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.2.11. It has been rated as critical. The affected element is the function hidp_session_thread. The manipulation leads to use after free. This vulnerability is referenced as CVE-2023-54120. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.2.11 and classified as critical. This issue affects the function hidp_session_thread. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2023-54120 since 12/24/2025. The exploitation is known to be easy. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/03/2026).

The vulnerability scanner Nessus provides a plugin with the ID 279789 (Linux Distros Unpatched Vulnerability : CVE-2023-54120), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.14.313, 4.19.281, 5.4.241, 5.10.178, 5.15.108, 6.1.25 or 6.2.12 eliminates this vulnerability. Applying the patch 152f47bd6b995e0e98c85672f6d19894bc287ef2/5f3d214d19899183d4e0cce7552998262112e4ab/8a99e6200c38b78a45dcd12a6bdc43fdf4dc36be/f7ec5ca433ceead8d9d78fd2febff094f289441d/0efb276d5848a3accc37c6f41b85e442c4768169/f6719fd8f409fa1da8dc956e93822d25e1e8b360/248af9feca062a4ca9c3f2ccf67056c8a5eb817f/c95930abd687fcd1aa040dc4fe90dff947916460 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (279789) and CERT Bund (WID-SEC-2025-2929). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Open Source Linux Kernel

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 279789
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2023-54120

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 4.14.313/4.19.281/5.4.241/5.10.178/5.15.108/6.1.25/6.2.12
Patch: 152f47bd6b995e0e98c85672f6d19894bc287ef2/5f3d214d19899183d4e0cce7552998262112e4ab/8a99e6200c38b78a45dcd12a6bdc43fdf4dc36be/f7ec5ca433ceead8d9d78fd2febff094f289441d/0efb276d5848a3accc37c6f41b85e442c4768169/f6719fd8f409fa1da8dc956e93822d25e1e8b360/248af9feca062a4ca9c3f2ccf67056c8a5eb817f/c95930abd687fcd1aa040dc4fe90dff947916460

Timelineinfo

12/24/2025 Advisory disclosed
12/24/2025 +0 days CVE reserved
12/24/2025 +0 days VulDB entry created
01/03/2026 +10 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-54120 (🔒)
GCVE (CVE): GCVE-0-2023-54120
GCVE (VulDB): GCVE-100-338135
CERT Bund: WID-SEC-2025-2929 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 12/24/2025 15:15
Updated: 01/03/2026 04:20
Changes: 12/24/2025 15:15 (58), 12/28/2025 12:26 (2), 01/03/2026 04:20 (7)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you know our Splunk app?

Download it now for free!