Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work hci_uart_set_proto() sets HCI_UART_PROTO_INIT before calling hci_uart_register_dev(), which calls proto->open() to initialize hu->priv. However, if a TTY write wakeup occurs during this window, hci_uart_tx_wakeup() may schedule write_work before hu->priv is initialized, leading to a NULL pointer dereference in hci_uart_write_work() when proto->dequeue() accesses hu->priv. The race condition is: CPU0 CPU1 ---- ---- hci_uart_set_proto() set_bit(HCI_UART_PROTO_INIT) hci_uart_register_dev() tty write wakeup hci_uart_tty_wakeup() hci_uart_tx_wakeup() schedule_work(&hu->write_work) proto->open(hu) // initializes hu->priv hci_uart_write_work() hci_uart_dequeue() proto->dequeue(hu) // accesses hu->priv (NULL!) Fix this by moving set_bit(HCI_UART_PROTO_INIT) after proto->open() succeeds, ensuring hu->priv is initialized before any work can be scheduled.
CVE-2026-23146
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-2026-23146
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": "a40f94f7caa8d3421b64f63ac31bc0f24c890f39",
"lessThan": "b0a900939e7e4866d9b90e9112514b72c451e873",
"versionType": "git"
},
{
"status": "affected",
"version": "9e5a0f5777162e503400c70c6ed25fbbe2d38799",
"lessThan": "ccc683f597ceb28deb966427ae948e5ac739a909",
"versionType": "git"
},
{
"status": "affected",
"version": "80f14e9de6a43a0bd8194cad1003a3e6dcbc3984",
"lessThan": "937a573423ce5a96fdb1fd425dc6b8d8d4ab5779",
"versionType": "git"
},
{
"status": "affected",
"version": "02e1bcdfdf769974e7e9fa285e295cd9852e2a38",
"lessThan": "186d147cf7689ba1f9b3ddb753ab634a84940cc9",
"versionType": "git"
},
{
"status": "affected",
"version": "281782d2c6730241e300d630bb9f200d831ede71",
"lessThan": "53e54cb31e667fca05b1808b990eac0807d1dab0",
"versionType": "git"
},
{
"status": "affected",
"version": "5df5dafc171b90d0b8d51547a82657cd5a1986c7",
"lessThan": "03e8c90c62233382042b7bd0fa8b8900552fdb62",
"versionType": "git"
},
{
"status": "affected",
"version": "5df5dafc171b90d0b8d51547a82657cd5a1986c7",
"lessThan": "0c3cd7a0b862c37acbee6d9502107146cc944398",
"versionType": "git"
},
{
"status": "affected",
"version": "1dcf08fcff5ca529de6dc0395091f28854f4e54a",
"versionType": "git"
},
{
"status": "affected",
"version": "8e5aff600539e5faea294d9612cca50220e602b8",
"versionType": "git"
},
{
"status": "affected",
"version": "db7509fa110dd9b11134b75894677f30353b2c51",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.237",
"lessThan": "5.10.249",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.181",
"lessThan": "5.15.199",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.135",
"lessThan": "6.1.162",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.88",
"lessThan": "6.6.123",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.24",
"lessThan": "6.12.69",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.293",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.13.12",
"lessThan": "6.14",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.14.3",
"lessThan": "6.15",
"versionType": "semver"
}
],
"programFiles": [
"drivers/bluetooth/hci_ldisc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.249",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.199",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.162",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.123",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.69",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.9",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/bluetooth/hci_ldisc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23146
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #39769 · Revision 1
- Added to Heist Feed
- Publisher date