In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix use of wrong skb when comparing queued RESP challenge serial. In rxrpc_post_response(), the code should be comparing the challenge serial number from the cached response before deciding to switch to a newer response, but looks at the newer packet private data instead, rendering the comparison always false. Fix this by switching to look at the older packet. Fix further to substitute the new packet in place of the old one if newer and also to release whichever we don't use.
This vulnerability allows attackers to exploit the system, potentially affecting its availability. The CVSS score of 7.5 indicates a high severity level, necessitating immediate attention from organizations.
Organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability. The exploitation status indicates that no public exploit is currently available, but the potential for a future exploit remains.
The vulnerability was published on April 24, 2026, and affects various versions of the Linux kernel. It is critical for organizations using affected systems to remain vigilant and apply necessary updates.
Risk to organizations includes potential disruption of services and degradation of system performance, reinforcing the need for prompt remediation.
The vulnerability is classified under CWE-401, indicating a potential issue with improper resource management. It is essential for security teams to evaluate the implications of this flaw in their operational environments.
Vulnerability Details
In the Linux kernel, the vulnerability arises from a flaw in the rxrpc_post_response() function, where the challenge serial number comparison is incorrectly conducted. This discrepancy can lead to incorrect decision-making in response handling. The vulnerability has a CVSS score of 7.5, indicating high severity, primarily affecting availability.
Affected systems include multiple versions of the Linux kernel, particularly those in the 6.16.x and 7.0.x series. Organizations must ensure they are using updated versions to mitigate potential risks.
Technical Analysis
The root cause of the vulnerability lies in an incorrect comparison logic within the rxrpc_post_response() function. The attack vector for this vulnerability is network-based, with low complexity required for exploitation. No privileges are required, and user interaction is not needed for exploitation.
Risk & Impact Analysis
The potential risks associated with this vulnerability include service disruption and degradation of system performance, significantly impacting organizations relying on the Linux kernel for critical functions. Given its high severity, organizations should address this issue promptly.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects the following versions of the Linux kernel: versions from 6.16.1 to 6.18.22 and 6.19 to 6.19.12, along with several release candidates of version 7.0.
Mitigation & Remediation
Organizations should prioritize patching immediately. To remediate this vulnerability, upgrade to the latest version of the Linux kernel that addresses this flaw. Additionally, security teams should consider implementing configuration hardening and network controls to further mitigate risks.
Detection Guidance
Monitor system logs for indicators of abnormal behavior related to the Linux kernel. Look for signs of unauthorized access or degradation in system performance that may indicate exploitation attempts.
AppSecure Threat Intelligence Insight
The significance of this vulnerability lies in its impact on system availability. Organizations should adopt a proactive approach to vulnerability management, including regular patching and security assessments. For more guidance on effective security practices, refer to our resources on penetration testing methodology and vulnerability management programs that can help in identifying and remediating vulnerabilities in a timely manner.
For further insights and trends in security, consider our blog on vulnerability exposure severity trends and our resources on VAPT testing services to enhance your security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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