# CVE-2026-80760: linux: In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: MGMT: reject HCI_CMD_SYNC params_len...

CVE-2026-80760 is fixed in linux on 1 platform by DEBIAN-CVE-2026-80760 (version 7.1.12-1), released September 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-80760
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 4, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: MGMT: reject HCI_CMD_SYNC params_len above 255  mgmt_hci_cmd_sync() checks that the message length agrees with params_len but puts no upper bound on it. params_len is __le16 while the parameter length in the HCI command header is a u8:  	struct hci_command_hdr { 		__le16	opcode; 		__u8	plen; 	} __packed;  hci_cmd_sync_alloc() assigns one to the other:  	hdr->plen = plen;  	if (plen) 		skb_put_data(skb, param, plen);  so a params_len of 256 leaves plen at 0 while all 256 bytes are still appended. The frame handed to the driver then declares no parameters and carries 256 of them. On a length framed transport such as H:4 the controller takes the trailing bytes as the start of the next packet.  The mgmt socket MTU is HCI_MAX_FRAME_SIZE, so params_len can reach about 1KB this way. Commit 03f1700b9b4d ("Bluetooth: MGMT: reject malformed HCI_CMD_SYNC commands") only made params_len agree with the message length, a value that fits the message but not the header field is still accepted.  Reject params_len that does not fit the header field.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.12-1 | [DEBIAN-CVE-2026-80760](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80760.md) | Sep 5, 2026 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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