CVE-2026-98823 Linux CVE debrief

Who should care

Defenders responsible for maintaining and securing Linux kernel-based systems should be aware of this vulnerability and prioritize patching affected versions. This includes operators, platform administrators, vulnerability management teams, and security teams who manage Linux kernel deployments. They should review the CVE record and source item for details on affected versions and patching guidance.

Why it matters

Defenders should prioritize patching affected Linux kernel versions to prevent potential use-after-free errors and system instability.

• Potential use-after-free errors could lead to system crashes or instability
• Successful exploitation could result in denial-of-service (DoS) conditions
• Defenders should verify Linux kernel versions to ensure they are not vulnerable

Technical summary

The Linux kernel's cfg80211 has a vulnerability where hidden-group probe-response entries could borrow beacon IEs from the group's beacon entry. When these entries are merged after a channel switch, copying the borrowed beacon IEs can lead to double-free errors when the group's beacon entry is released. This vulnerability has been addressed in the Linux kernel. Defenders should prioritize patching affected Linux kernel versions to prevent potential use-after-free errors. The vulnerability could result in system instability or crashes if exploited.

Defensive priority

Defenders should prioritize patching affected Linux kernel versions to prevent potential use-after-free errors.

Recommended defensive actions

• Patch affected Linux kernel versions to prevent potential use-after-free errors
• Review and update Linux kernel versions to ensure they are not vulnerable
• Monitor Linux kernel updates for potential security patches
• Verify Linux kernel versions to ensure they are not vulnerable
• 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 the vulnerability, including its description and affected versions. The Linux kernel's cfg80211 has a vulnerability where hidden-group probe-response entries could borrow beacon IEs from the group's beacon entry. When these entries are merged after a channel switch, copying the borrowed beacon IEs can lead to double-free errors when the group's beacon entry is released. The source item and CVE record provide evidence of the vulnerability's existence and its potential impact. However, a

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.