CVE-2023-54090 is a vulnerability in the Linux kernel's ixgbe component that has been resolved. The issue arises when using XDP (eXpress Data Path) programs on systems with more than 64 CPUs, which can lead to kernel panics.
This vulnerability allows the kernel to panic due to an array-index-out-of-bounds condition when attempting to utilize the XDP TX rings improperly. The fix for this issue was implemented in commit 4fe815850bdc, which aimed to improve functionality on systems exceeding 64 CPUs.
Risk to organizations includes potential downtime and instability in systems that depend on the ixgbe driver. The exploitability of this vulnerability is assessed as low, but organizations should prioritize vigilance and monitor for any updates related to this vulnerability.
Organizations should prioritize patching immediately as further details regarding the exploitation status remain unclear.
Vulnerability Details
In the Linux kernel, the following vulnerability has been resolved: ixgbe: Fix panic during XDP_TX with > 64 CPUs Commit 4fe815850bdc ("ixgbe: let the xdpdrv work with more than 64 cpus") adds support to allow XDP programs to run on systems with more than 64 CPUs by locking the XDP TX rings and indexing them using cpu % 64 (IXGBE_MAX_XDP_QS).
Upon trying this out patch on a system with more than 64 cores, the kernel paniced with an array-index-out-of-bounds at the return in ixgbe_determine_xdp_ring in ixgbe.h.
An example error message from the system illustrates the panic situation: "UBSAN: array-index-out-of-bounds in /var/lib/dkms/ixgbe/5.18.6+focal-1/build/src/ixgbe.h:1147:26 index 65 is out of range for type 'ixgbe_ring *[64]'"
The kernel panic can occur under certain conditions when the ixgbe_xdp_locking_key is not properly managed during the loading and unloading of XDP programs.
Technical Analysis
The root cause of the vulnerability stems from incorrect handling of the ixgbe_xdp_locking_key, which resulted in the kernel attempting to access an invalid index in an array. The attack vector is primarily local, as the issue arises when executing XDP programs.
The complexity of the attack is considered low, as the conditions leading to the kernel panic can be triggered with minimal effort by loading an XDP program on a system with more than 64 CPUs.
No user interaction is required to trigger this vulnerability. The impact on confidentiality, integrity, and availability is significant, as it can lead to complete system crashes.
Risk & Impact Analysis
Real-world deployment risk includes potential downtime and loss of service for organizations using affected systems. The blast radius can be extensive, particularly for organizations leveraging high-core-count systems in critical applications.
Organizations should address in priority patch cycle to mitigate any associated risks. With the current CVSS score not officially scored, the urgency level remains moderate.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions prior to vendor patch.
Mitigation & Remediation
Organizations should monitor for patches and updates related to CVE-2023-54090. As the vulnerability is considered low priority, remediation can be scheduled accordingly. For more comprehensive security, organizations may consider engaging in penetration testing to identify potential weaknesses.
Detection Guidance
Monitoring logs for kernel panic messages can provide early indicators of potential issues stemming from this vulnerability. Additionally, observing behavioral anomalies in network traffic associated with XDP programs can help identify misuse.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-54090 highlights the importance of rigorous testing for kernel-level drivers, particularly in high-performance environments. Security teams should establish robust processes for transitioning configurations.
This vulnerability represents a broader pattern of potential system instability in complex environments. Teams should learn from this incident to improve their validation processes and prevent similar vulnerabilities in the future.
For strategic defensive takeaways, organizations should regularly update their security assessments and consider the implications of high-core-count systems in their network architecture.
Further resources on improving security posture can be found in our penetration testing methodology and vulnerability management program design.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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