CVE-2026-98737
Description
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: hci_sync: Fix inquiry cache use-after-free
The sync command worker holds hdev->req_lock, but inquiry-cache updates
and flushes use hdev->lock. Both hci_acl_create_conn_sync() and
hci_stop_discovery_sync() look up entries and read their fields without
taking hdev->lock.
After either lookup returns, a concurrent HCIINQUIRY ioctl can acquire
hdev->lock and flush the cache, freeing the entry. The worker then reads
the freed entry while preparing a create-connection or remote-name-cancel
command. The list traversal also races with cache updates and removal.
KASAN reported these accesses:
BUG: KASAN: slab-use-after-free in hci_acl_create_conn_sync+0x5f1/0x650
Workqueue: hci0 hci_cmd_sync_work
Call Trace:
hci_acl_create_conn_sync+0x5f1/0x650
hci_cmd_sync_work+0x13c/0x290
Allocated by task 90:
hci_inquiry_cache_update+0x3e6/0x7d0
hci_inquiry_result_evt+0x3cb/0x560
Freed by task 93:
hci_inquiry_cache_flush+0x111/0x2b0
hci_inquiry+0x2f2/0x780
hci_sock_ioctl+0x269/0x5f0
BUG: KASAN: slab-use-after-free in hci_stop_discovery_sync+0x3b1/0x3c0
Workqueue: hci0 hci_cmd_sync_work
Call Trace:
hci_stop_discovery_sync+0x3b1/0x3c0
hci_cmd_sync_work+0x173/0x300
Allocated by task 86:
hci_inquiry_cache_update+0x483/0x940
hci_inquiry_result_evt+0x3cb/0x560
Freed by task 91:
hci_inquiry_cache_flush+0x13e/0x2f0
hci_inquiry+0x2f2/0x780
hci_sock_ioctl+0x269/0x5f0
Hold hdev->lock across each lookup and all reads from its result. Copy the
remote address before unlocking so discovery cancellation does not retain
a cache entry pointer. Release the lock before sending synchronous HCI
commands, since their completion handlers may need the same lock.
EPSS (Exploit Prediction Scoring System)
EPSS (Exploit Prediction Scoring System)
Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.