Opcode aliasing in Linux kernel Bluetooth HCI socket filter
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 7 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
The Linux kernel Bluetooth raw HCI socket security filter masks the 10-bit command opcode field to 127 instead of 128 bits per group, so a reserved command code can alias an allowlisted command. An unprivileged local user who can open a raw HCI socket can submit such a reserved code to run a command the filter is meant to block. A conforming controller should reject reserved opcodes, but the host must not depend on that.
Written with Claude Haiku 5.5 from the sources below · 2026-10-30
Description from the CNA
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sock: reject out-of-range OCF values The raw HCI socket security filter has 128 OCF bits per supported OGF, but masks the 10-bit OCF with 127 before looking up the command. An unprivileged socket can therefore submit a reserved OCF that aliases an allowlisted command modulo 128. A conforming controller should reject reserved opcodes. Nevertheless, the security decision must apply to the opcode that will actually be sent, especially since controller-specific behavior is outside the host stack's control. Reject OCF values that cannot be represented by the security filter instead of aliasing them onto an unrelated command.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 2.6.12 and later | 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.55, 7.2.9, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.12 and later Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.55, 7.2.9, 7.3 Patch available CNA
Remediation
The Linux kernel is fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.55, 7.2.9 and 7.3. The sources list no fixed version for Red Hat Enterprise Linux 6 (no fix planned), Red Hat Enterprise Linux 7, 8, 9 and 10, or Red Hat OpenShift Container Platform 4 and 5.
Written with Claude Haiku 5.5 from the sources below · 2026-10-30
- Fix · CNA Linux (Linux) Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.55, 7.2.9, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-18 Threatist record created from CVE-2026-98460
- 2026-10-18 Alias added: GHSA-66xw-2cgj-6x3v
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-20 Affected versions changed · Red Hat
- 2026-10-20 CVSS score added · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/70b0a27bdde0cb524349c8261202c7c9393cf5e9
- https://git.kernel.org/stable/c/598686f5d65b9af2223ed9d22fadba16e09f6ca8
- https://git.kernel.org/stable/c/c1fd465ea1c5aef459f9bc3ac602b5353e0f536f
- https://git.kernel.org/stable/c/68f0bcc4e16e31ff8dbe6ca93116eb70d7b6ac44
- https://git.kernel.org/stable/c/320dedad15e8bbaecc8d2d7fd4189defb84caa85
- https://git.kernel.org/stable/c/173457fa3e99ef4188dd0fe63e4dee98d0e441a9
- https://git.kernel.org/stable/c/47d67ec424e63e61e9eb58633d43a9d58a1852b6
- https://git.kernel.org/stable/c/e93fad891c72deb84cae49430163b384ebcc92b1
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Sources
- CVE-2026-98460 · CVE Program
- CVE-2026-98460 · NVD
- FIRST EPSS
- GHSA-66xw-2cgj-6x3v · GitHub Advisory Database · CC BY 4.0
- CVE-2026-98460 · Red Hat security data · CC BY 4.0
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