Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected cf75ad8b41d2aa06f98f365d42a3ae8b059daddd before ddc9edb244cc8b5266595e8fc220e7813f2b603a; affected cf75ad8b41d2aa06f98f365d42a3ae8b059daddd before 52edf1c0e59dea37b8368c4a2559dca96b2fdfea; affected cf75ad8b41d2aa06f98f365d42a3ae8b059daddd before 333257e6e4a7bcaaea82fd357121d0f1e6b76c7b; affected cf75ad8b41d2aa06f98f365d42a3ae8b059daddd before a642f498f0b08f2aa9f4a69468db92f57a72349d; affected cf75ad8b41d2aa06f98f365d42a3ae8b059daddd before 8ed67535fdff40ca652bcd4ac7da68d11d01bd34 |
| Linux / Linux | affected 5.17; unaffected 0 before 5.17; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.56 through 6.18.*; unaffected 7.2.10 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ddc9edb244cc8b5266595e8fc220e7813f2b603a
- https://git.kernel.org/stable/c/52edf1c0e59dea37b8368c4a2559dca96b2fdfea
- https://git.kernel.org/stable/c/333257e6e4a7bcaaea82fd357121d0f1e6b76c7b
- https://git.kernel.org/stable/c/a642f498f0b08f2aa9f4a69468db92f57a72349d
- https://git.kernel.org/stable/c/8ed67535fdff40ca652bcd4ac7da68d11d01bd34