CVE-2025-71100 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, as well as users who rely on the Linux kernel in their systems, should be aware of this vulnerability and take steps to mitigate it. This includes reviewing and applying patches from the Linux kernel repository, monitoring for potential exploitation attempts, and ensuring that the Linux kernel is updated to a version that includes the fix.

Why it matters

CVE-2025-71100 is a vulnerability in the Linux kernel's rtlwifi: 8192cu driver that can potentially lead to denial of service or arbitrary code execution. Linux kernel developers, maintainers, and users should be aware of this vulnerability and take steps to mitigate it.

• Potential denial of service due to out-of-range TID values.
• Possible execution of arbitrary code with elevated privileges.
• Increased risk of system crashes or instability.
• Need for patching and updating Linux kernel versions.

Technical summary

The vulnerability is caused by a TID out of range issue in the rtl92cu_tx_fill_desc() function in the Linux kernel's rtlwifi: 8192cu driver. This issue can be exploited by an attacker to potentially cause a denial of service or execute arbitrary code. The vulnerability has a CVSS score of 7.6 and a severity of HIGH. The affected product is the Linux kernel, and users should review and apply patches from the Linux kernel repository to mitigate the vulnerability. The official CVE Program record and NIST NVD detail page provide additional information on the vulnerability.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided patches from the Linux kernel repository.
• Ensure that the Linux kernel is updated to a version that includes the fix.
• Monitor for any potential exploitation attempts using network traffic analysis tools.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide details on a Linux kernel vulnerability in the rtlwifi: 8192cu driver. The vulnerability is related to a TID out of range issue in the rtl92cu_tx_fill_desc() function. The source confidence is limited, and defenders should verify the affected scope and severity. The official CVE Program record and NIST NVD detail page provide additional information on the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.