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CVE-2026-64406 Linux CVE debrief

A use-after-free vulnerability exists in the Linux kernel's Bluetooth subsystem, specifically in the `bt_accept_dequeue()` function. This vulnerability could potentially allow an attacker to access sensitive information or execute arbitrary code on affected systems. The vulnerability has been resolved in various Linux kernel versions. Linux administrators and developers should assess their exposure to CVE-2026-64406 and apply patches or updates as needed to prevent potential attacks. The vulnerability was introduced in the Linux kernel and affects various versions.

Vendor
Linux
Product
Unknown
CVSS
HIGH 8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-25
Original CVE updated
2026-10-19
Advisory published
2026-07-25
Advisory updated
2026-10-19

Who should care

Linux administrators, developers, and users who rely on Bluetooth functionality should assess their exposure to CVE-2026-64406 and apply patches or updates as needed. Linux kernel developers and maintainers should review the vulnerability and apply patches or updates to affected versions. Security teams and vulnerability management teams should verify Linux kernel versions to determine if they are affected by CVE-2026-64406 and prioritize patching or mitig

Why it matters

CVE-2026-64406 is a use-after-free vulnerability in the Linux kernel's Bluetooth subsystem. Linux administrators and developers should assess their exposure and apply patches or updates as needed to prevent potential attacks.

  • Verify Linux kernel versions to determine if they are affected by CVE-2026-64406
  • Apply patches or updates to fix the use-after-free vulnerability in bt_accept_dequeue()

Technical summary

The Linux kernel's Bluetooth subsystem has a use-after-free vulnerability in the `bt_accept_dequeue()` function. This vulnerability could potentially allow an attacker to access sensitive information or execute arbitrary code on affected systems. The vulnerability has been resolved in various Linux kernel versions. The CVE Program record and NVD vulnerability detail provide information on the vulnerability. However, the exact impact and affected versions require verification from the supplied official sources. Linux administrators and developers should assess their exposure and apply patches or updates as needed to prevent potential attacks.

Defensive priority

High

Recommended defensive actions

  • Review Linux kernel versions and determine if they are affected by CVE-2026-64406
  • Apply patches or updates to fix the use-after-free vulnerability in bt_accept_dequeue()
  • Monitor Bluetooth-related logs and network traffic for suspicious activity
  • Verify Linux kernel versions to determine if they are affected by CVE-2026-64406
  • 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 vulnerability was introduced in the Linux kernel and affects various versions. The CVE Program record and NVD vulnerability detail provide information on the vulnerability. However, the exact impact and affected versions require verification from the supplied official sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-64406 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-64406

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-64406 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-64406

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Bluetooth: fix UAF in bt_accept_dequeue()

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/64xxx/CVE-2026-64406.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/c0577c55219be42b6ea2ea8db11e85bfab6f4e8d

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/96ad400d5132eb333f28f6f1e2d58f0728ca9547

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/c66a95e60b65d876a927123b0ed36bd6177d9ca6

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/6303ed4bbe0095f4cc195225479bf506e010d1db

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/26168db1ce5a9766cde021b18e590a101c056614

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/50c662bdcd51b03033a0abed6716bfd377ba1049

    Supplemental source

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.