ubuntu-cve-2026-10658
Vulnerability from osv_ubuntu
Published
2026-06-23 01:16
Modified
2026-07-15 17:48
Summary
Details
bt_iso_recv() in subsys/bluetooth/host/iso.c pulled the ISO SDU header (4 bytes) or, when the timestamp flag is set, the timestamped SDU header (8 bytes) from the inbound HCI ISO Data buffer via net_buf_pull_mem() without first checking buf->len. The upstream hci_iso() handler enforces buf->len == the controller-declared ISO Data_Load length, so a malicious or buggy controller / adjacent BLE peer on an established CIS/BIS can present a first-fragment (BT_ISO_START) or single (BT_ISO_SINGLE) PDU shorter than the SDU header. Because net_buf_simple_pull_mem only guards length with __ASSERT_NO_MSG (compiled out when CONFIG_ASSERT is disabled, the production default), the pull underflows buf->len (uint16_t, e.g. 0 - 8 = 0xFFF8) and advances buf->data past valid data: the subsequent reads of hdr->slen and hdr->sn are out-of-bounds reads of adjacent pool memory. For the multi-fragment (START) case the corrupted buffer is retained as iso->rx, and a following CONT/END fragment's net_buf_tailroom() guard underflows to a near-SIZE_MAX value, defeating the bounds check and causing net_buf_add_mem() to memcpy attacker-supplied fragment data far past the RX pool buffer (out-of-bounds write). The flaw affects ISO receive builds (CONFIG_BT_ISO_RX, selected by the default-off LE Audio options BT_ISO_PERIPHERAL/BT_ISO_CENTRAL/BT_ISO_SYNC_RECEIVER) and has existed since the ISO subsystem was introduced (v2.6.0) through v4.4.0. The fix adds explicit buf->len < sizeof(ts_hdr) and buf->len < sizeof(hdr) checks that drop the buffer before pulling.
Severity
7.1 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libzephyr4",
"binary_version": "3.1.2-1build1"
},
{
"binary_name": "libzephyr4-krb5",
"binary_version": "3.1.2-1build1"
},
{
"binary_name": "zephyr-clients",
"binary_version": "3.1.2-1build1"
},
{
"binary_name": "zephyr-server",
"binary_version": "3.1.2-1build1"
},
{
"binary_name": "zephyr-server-krb5",
"binary_version": "3.1.2-1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "zephyr",
"purl": "pkg:deb/ubuntu/zephyr@3.1.2-1build1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.2-1",
"3.1.2-1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libzephyr4",
"binary_version": "3.1.2-1build2"
},
{
"binary_name": "libzephyr4-krb5",
"binary_version": "3.1.2-1build2"
},
{
"binary_name": "zephyr-clients",
"binary_version": "3.1.2-1build2"
},
{
"binary_name": "zephyr-server",
"binary_version": "3.1.2-1build2"
},
{
"binary_name": "zephyr-server-krb5",
"binary_version": "3.1.2-1build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "zephyr",
"purl": "pkg:deb/ubuntu/zephyr@3.1.2-1build2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.2-1build1",
"3.1.2-1build2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libzephyr4",
"binary_version": "3.1.2-1build3"
},
{
"binary_name": "libzephyr4-krb5",
"binary_version": "3.1.2-1build3"
},
{
"binary_name": "zephyr-clients",
"binary_version": "3.1.2-1build3"
},
{
"binary_name": "zephyr-server",
"binary_version": "3.1.2-1build3"
},
{
"binary_name": "zephyr-server-krb5",
"binary_version": "3.1.2-1build3"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "zephyr",
"purl": "pkg:deb/ubuntu/zephyr@3.1.2-1build3?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.2-1build3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libzephyr4",
"binary_version": "3.1.2-1build3"
},
{
"binary_name": "libzephyr4-krb5",
"binary_version": "3.1.2-1build3"
},
{
"binary_name": "zephyr-clients",
"binary_version": "3.1.2-1build3"
},
{
"binary_name": "zephyr-server",
"binary_version": "3.1.2-1build3"
},
{
"binary_name": "zephyr-server-krb5",
"binary_version": "3.1.2-1build3"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "zephyr",
"purl": "pkg:deb/ubuntu/zephyr@3.1.2-1build3?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.2-1build3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libzephyr4",
"binary_version": "3.1.2-1.1build1"
},
{
"binary_name": "libzephyr4-krb5",
"binary_version": "3.1.2-1.1build1"
},
{
"binary_name": "zephyr-clients",
"binary_version": "3.1.2-1.1build1"
},
{
"binary_name": "zephyr-server",
"binary_version": "3.1.2-1.1build1"
},
{
"binary_name": "zephyr-server-krb5",
"binary_version": "3.1.2-1.1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "zephyr",
"purl": "pkg:deb/ubuntu/zephyr@3.1.2-1.1build1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
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"3.1.2-1.1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libzephyr4",
"binary_version": "3.1.2-1.1build1"
},
{
"binary_name": "libzephyr4-krb5",
"binary_version": "3.1.2-1.1build1"
},
{
"binary_name": "zephyr-clients",
"binary_version": "3.1.2-1.1build1"
},
{
"binary_name": "zephyr-server",
"binary_version": "3.1.2-1.1build1"
},
{
"binary_name": "zephyr-server-krb5",
"binary_version": "3.1.2-1.1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "zephyr",
"purl": "pkg:deb/ubuntu/zephyr@3.1.2-1.1build1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.2-1.1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libzephyr4",
"binary_version": "3.1.2-4"
},
{
"binary_name": "libzephyr4-krb5",
"binary_version": "3.1.2-4"
},
{
"binary_name": "zephyr-clients",
"binary_version": "3.1.2-4"
},
{
"binary_name": "zephyr-server",
"binary_version": "3.1.2-4"
},
{
"binary_name": "zephyr-server-krb5",
"binary_version": "3.1.2-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "zephyr",
"purl": "pkg:deb/ubuntu/zephyr@3.1.2-4?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.1.2-1.1build1",
"3.1.2-4"
]
}
],
"aliases": [],
"details": "bt_iso_recv() in subsys/bluetooth/host/iso.c pulled the ISO SDU header (4 bytes) or, when the timestamp flag is set, the timestamped SDU header (8 bytes) from the inbound HCI ISO Data buffer via net_buf_pull_mem() without first checking buf-\u003elen. The upstream hci_iso() handler enforces buf-\u003elen == the controller-declared ISO Data_Load length, so a malicious or buggy controller / adjacent BLE peer on an established CIS/BIS can present a first-fragment (BT_ISO_START) or single (BT_ISO_SINGLE) PDU shorter than the SDU header. Because net_buf_simple_pull_mem only guards length with __ASSERT_NO_MSG (compiled out when CONFIG_ASSERT is disabled, the production default), the pull underflows buf-\u003elen (uint16_t, e.g. 0 - 8 = 0xFFF8) and advances buf-\u003edata past valid data: the subsequent reads of hdr-\u003eslen and hdr-\u003esn are out-of-bounds reads of adjacent pool memory. For the multi-fragment (START) case the corrupted buffer is retained as iso-\u003erx, and a following CONT/END fragment\u0027s net_buf_tailroom() guard underflows to a near-SIZE_MAX value, defeating the bounds check and causing net_buf_add_mem() to memcpy attacker-supplied fragment data far past the RX pool buffer (out-of-bounds write). The flaw affects ISO receive builds (CONFIG_BT_ISO_RX, selected by the default-off LE Audio options BT_ISO_PERIPHERAL/BT_ISO_CENTRAL/BT_ISO_SYNC_RECEIVER) and has existed since the ISO subsystem was introduced (v2.6.0) through v4.4.0. The fix adds explicit buf-\u003elen \u003c sizeof(ts_hdr) and buf-\u003elen \u003c sizeof(hdr) checks that drop the buffer before pulling.",
"id": "UBUNTU-CVE-2026-10658",
"modified": "2026-07-15T17:48:10Z",
"published": "2026-06-23T01:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-10658"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-10658"
},
{
"type": "REPORT",
"url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-26g8-rmpf-j6cw"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-10658"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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