Bluetooth: MGMT: reject HCI_CMD_SYNC params_len above 255
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.
CVE-2026-80760
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80760
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
"lessThan": "b7d9edcf9fe6e9ec3a2e80ef9e8d44ef9b4f2894",
"versionType": "git"
},
{
"status": "affected",
"version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
"lessThan": "0bd0195ce25737cbdd0eabc54319ee0ddf3a0ad2",
"versionType": "git"
},
{
"status": "affected",
"version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
"lessThan": "6e1c44878aa3ee7336efeaf01414b030b0a5c273",
"versionType": "git"
},
{
"status": "affected",
"version": "827af4787e74e8df9e8e0677a69fbb15e0856d2f",
"lessThan": "5d95286b6d6e8f1d304da7522bfa6860fc017e48",
"versionType": "git"
}
],
"programFiles": [
"net/bluetooth/mgmt.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.47",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.11",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.1",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/bluetooth/mgmt.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80760
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #34781 · Revision 1
- Added to Heist Feed
- Publisher date