CVE-2026-98460 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel systems, especially those using Bluetooth, should assess exposure and prioritize patching. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify Linux kernel versions, review Bluetooth usage, and monitor for potential security filter bypass attempts.

Why it matters

Defenders should care about CVE-2026-98460 as it affects Linux kernel systems using Bluetooth, potentially allowing unprivileged socket exploitation and security filter bypass. Verification and patching are crucial.

• Potential security filter bypass
• Unprivileged socket exploitation
• Controller-specific behavior impact

Technical summary

The Linux kernel's Bluetooth hci_sock component has a vulnerability where an unprivileged socket can submit a reserved OCF that aliases an allowlisted command modulo 128. This issue allows potential security filter bypass and unprivileged socket exploitation. The vulnerability affects Linux kernel systems using Bluetooth. A conforming controller should reject reserved opcodes, but the security decision must apply to the opcode that will actually be sent. The issue is resolved by rejecting OCF values that cannot be represented by the security filter. Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, especially in environments where Bluetooth is  

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, especially in environments where Bluetooth is used.

Recommended defensive actions

• Verify Linux kernel versions and apply patches for CVE-2026-98460
• Review Bluetooth usage in environments and assess exposure
• Monitor for potential security filter bypass attempts
• Track exceptions and retest remediated assets
• Check relevant monitoring, detection, and logs for exposed assets
• Review compensating controls for exposed systems
• Plan vendor-supported updates or mitigations through normal change control

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but specific affected versions and exploitation details are not provided. Further verification is needed to determine the impact and required remediation.

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.