CVE-2026-93803 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel configurations and versions should assess potential exposure and prioritize patching. Linux kernel developers and maintainers should verify and apply patches.

Why it matters

CVE-2026-93803 is a vulnerability in the Linux kernel's libipw module that requires bounds checking for the WEP key index. Defenders should prioritize patching and verifying Linux kernel versions to prevent potential local issues.

• Verify and apply patches for Linux kernel versions related to libipw to prevent potential local issues
• Review Linux kernel configurations and versions for potential exposure to assess and mitigate risks

Technical summary

The Linux kernel's libipw module has a vulnerability related to improper bounds checking for the WEP key index in the libipw_rx function. This could potentially lead to local issues. The fix involves requiring hdrlen + 4 bytes before reading the key index item in both software-decrypt key selection and hardware-decrypted IV/ICV strip paths. Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly those related to libipw. The vulnerability requires careful review of Linux kernel configurations and versions to prevent potential local issues.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly those related to libipw.

Recommended defensive actions

• Verify and apply patches for Linux kernel versions related to libipw
• Review Linux kernel configurations and versions for potential exposure
• Monitor Linux kernel updates and advisories for further information
• 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
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record and associated sources indicate a vulnerability in the Linux kernel's libipw module related to improper bounds checking for the WEP key index. However, specific details about exploitation, impact, and affected versions are limited.

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.