In the Linux kernel, the following vulnerability has been resolved: wifi: ath9k: Fix use-after-free in ath9k_hif_usb_disconnect(). This vulnerability allows a use-after-free condition that occurs in ath9k_hif_usb_disconnect() when ath9k_destroy_wmi() is trying to access 'drv_priv' that has already been freed. This issue arises when ieee80211_free_hw() is called by ath9k_htc_hw_deinit().
The patch moves ath9k_destroy_wmi() before ieee80211_free_hw(). Note that urbs from the driver should be killed before freeing 'wmi' with ath9k_destroy_wmi() as their callbacks will access 'wmi'.
Found by a modified version of syzkaller, this vulnerability has been classified with a low exploitation potential, but organizations should still remain vigilant.
Risk to organizations includes potential system crashes or unexpected behavior due to improper memory management. Organizations should prioritize monitoring their systems for any irregularities that could stem from this vulnerability.
Vulnerability Details
The vulnerability described in CVE-2022-50881 is characterized as a use-after-free issue. The use-after-free vulnerability allows an attacker to exploit memory that has been freed, potentially leading to arbitrary code execution or crashes.
Although the CVSS score is currently unknown, organizations should take note of its implications on system stability. The vulnerability affects the ath9k driver within the Linux kernel.
This issue was published on December 30, 2025, and it is important for organizations using affected systems to remain updated on available patches and remediation steps.
Technical Analysis
The root cause of the problem lies in the improper order of operations in the ath9k driver, specifically within the ath9k_hif_usb_disconnect() function. The function attempts to access a pointer that has already been freed, leading to potential use-after-free conditions.
The attack vector is local, as it requires access to the system where the vulnerable driver is running. The attack complexity is low, with no special privileges required for exploitation. User interaction is not required.
The impacts on confidentiality, integrity, and availability are significant, as the vulnerability can lead to system crashes. Organizations should assess their risk exposure accordingly.
Risk & Impact Analysis
Real-world deployment of this vulnerability poses risks including system instability and potential data loss. Organizations should be particularly cautious as the vulnerability has the potential to affect multiple devices running the Linux kernel.
The urgency for organizations to address this vulnerability is moderate, given its current classification of low exploitability and the absence of public exploits. Organizations should plan to schedule remediation in their regular patch cycles.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to the vendor patch are affected by this vulnerability. Organizations should ensure they are running the latest version of the Linux kernel to mitigate risks.
Mitigation & Remediation
To remediate this vulnerability, organizations should apply the latest patches provided by the Linux kernel maintainers. Regular updates and monitoring are essential to ensure that vulnerabilities are addressed promptly.
Organizations may also consider implementing configuration hardening and network controls to mitigate risks associated with driver vulnerabilities.
For further guidance, organizations can consult our application security assessment services.
Detection Guidance
Organizations should monitor relevant logs for indicators of exploitation or unusual behavior linked to the ath9k driver. Behavioral anomalies and system changes related to USB disconnect events should be closely examined.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its representation of potential weaknesses in the Linux kernel's handling of driver memory management. Organizations should learn from this incident to implement better coding practices and improve their security posture.
This vulnerability exemplifies the importance of thorough testing and validation in driver development. Security teams should focus on proactive measures to identify and remediate vulnerabilities before they can be exploited.
For more insights into security strategies, organizations can review our vulnerability management program and consider enhancing their penetration testing methodology to identify and rectify similar vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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