GHSA-3CPR-9MC9-3VFM
Vulnerability from github – Published: 2024-05-21 18:31 – Updated: 2024-05-21 18:31In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: Fix double free in hci_conn_cleanup
syzbot reports a slab use-after-free in hci_conn_hash_flush [1]. After releasing an object using hci_conn_del_sysfs in the hci_conn_cleanup function, releasing the same object again using the hci_dev_put and hci_conn_put functions causes a double free. Here's a simplified flow:
hci_conn_del_sysfs: hci_dev_put put_device kobject_put kref_put kobject_release kobject_cleanup kfree_const kfree(name)
hci_dev_put: ... kfree(name)
hci_conn_put: put_device ... kfree(name)
This patch drop the hci_dev_put and hci_conn_put function call in hci_conn_cleanup function, because the object is freed in hci_conn_del_sysfs function.
This patch also fixes the refcounting in hci_conn_add_sysfs() and hci_conn_del_sysfs() to take into account device_add() failures.
This fixes CVE-2023-28464.
{
"affected": [],
"aliases": [
"CVE-2023-52830"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-21T16:15:20Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Fix double free in hci_conn_cleanup\n\nsyzbot reports a slab use-after-free in hci_conn_hash_flush [1].\nAfter releasing an object using hci_conn_del_sysfs in the\nhci_conn_cleanup function, releasing the same object again\nusing the hci_dev_put and hci_conn_put functions causes a double free.\nHere\u0027s a simplified flow:\n\nhci_conn_del_sysfs:\n hci_dev_put\n put_device\n kobject_put\n kref_put\n kobject_release\n kobject_cleanup\n kfree_const\n kfree(name)\n\nhci_dev_put:\n ...\n kfree(name)\n\nhci_conn_put:\n put_device\n ...\n kfree(name)\n\nThis patch drop the hci_dev_put and hci_conn_put function\ncall in hci_conn_cleanup function, because the object is\nfreed in hci_conn_del_sysfs function.\n\nThis patch also fixes the refcounting in hci_conn_add_sysfs() and\nhci_conn_del_sysfs() to take into account device_add() failures.\n\nThis fixes CVE-2023-28464.",
"id": "GHSA-3cpr-9mc9-3vfm",
"modified": "2024-05-21T18:31:22Z",
"published": "2024-05-21T18:31:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52830"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3c4236f1b2a715e878a06599fa8b0cc21f165d28"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/53d61daf35b1bbf3ae06e852ee107aa2f05b3776"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/56a4fdde95ed98d864611155f6728983e199e198"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5c53afc766e07098429520b7677eaa164b593451"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/87624b1f9b781549e69f92db7ede012a21cec275"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a85fb91e3d728bdfc80833167e8162cce8bc7004"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ba7088769800d9892a7e4f35c3137a5b3e65410b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fc666d1b47518a18519241cae213de1babd4a4ba"
}
],
"schema_version": "1.4.0",
"severity": []
}
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