CVE-2026-98461 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel systems, particularly those using Bluetooth HCI sockets, should assess exposure and prioritize patching. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify patch application, review configurations, and monitor updates to prevent out-of-bounds reads and potential system crashes or information disclosure.

Why it matters

This vulnerability in the Linux kernel's Bluetooth HCI socket implementation can cause an out-of-bounds read when processing malformed events, potentially leading to system crashes or information disclosure. Defenders should prioritize verifying and applying patches, reviewing configurations, and monitoring updates.

• Verify patch application to prevent out-of-bounds reads
• Assess Bluetooth HCI socket configurations to prevent exposure to malformed events
• Monitor Linux kernel updates for patches and apply in a timely manner

Technical summary

The Linux kernel's Bluetooth HCI socket implementation is vulnerable to an out-of-bounds read when processing malformed events. The issue arises from the is_filtered_packet function reading event codes and command opcodes without validating the event length. This can be triggered by a controller or vhci device supplying a malformed event. The vulnerability has been resolved through a series of patches applied to the Linux kernel. Affected product deployments should be identified in managed environments, and owners should be assigned for follow-up. Official advisories or CVE records should be reviewed to validate affected scope, severity, and vendor guidance.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly in environments where Bluetooth HCI sockets are used.

Recommended defensive actions

• Verify and apply patches for Linux kernel versions affected by this vulnerability
• Review and update Bluetooth HCI socket configurations to prevent exposure to malformed events
• Monitor Linux kernel updates and apply patches in a timely manner
• Assess exposure of Linux kernel systems using Bluetooth HCI sockets
• 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

Evidence notes

The CVE record and associated source references provide details on the vulnerability and its resolution. However, specific versions of the Linux kernel affected by this vulnerability are not provided in the supplied corpus.

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.