Linux Kernel up to 6.18.46/7.1.10/7.2.0 Bluetooth MGMT mgmt_hci_cmd_sync params_len/plen buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.00

Summaryinfo

A vulnerability categorized as very critical has been discovered in Linux Kernel up to 6.18.46/7.1.10/7.2.0. This affects the function mgmt_hci_cmd_sync of the component Bluetooth MGMT. The manipulation of the argument params_len/plen results in buffer overflow. This vulnerability was named CVE-2026-80760. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.46/7.1.10/7.2.0. It has been classified as very critical. Affected is the function mgmt_hci_cmd_sync of the component Bluetooth MGMT. The manipulation of the argument params_len/plen with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-80760 since 08/26/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/04/2026).

Upgrading to version 6.18.47, 7.1.11, 7.2.1 or 7.3-rc1 eliminates this vulnerability. Applying the patch b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894/0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2/6e1c44878aa3ee7336efeaf01414b030b0a5c273/5d95286b6d6e8f1d304da7522bfa6860fc017e48 is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.47/7.1.11/7.2.1/7.3-rc1
Patch: b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894/0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2/6e1c44878aa3ee7336efeaf01414b030b0a5c273/5d95286b6d6e8f1d304da7522bfa6860fc017e48

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80760 (🔒)
GCVE (CVE): GCVE-0-2026-80760
GCVE (VulDB): GCVE-100-398868

Entryinfo

Created: 09/04/2026 17:43
Changes: 09/04/2026 17:43 (60)
Complete: 🔍
Cache ID: 216::103

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