Answer in brief
CVE-2026-98737 records a Unknown severity vulnerability in Bluetooth: hci_sync: Fix inquiry cache use-after-free. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cf75ad8b41d2aa06f98f365d42a3ae8b059daddd <52edf1c0e59dea37b8368c4a2559dca96b2fdfea || >=cf75ad8b41d2aa06f98f365d42a3ae8b059daddd <333257e6e4a7bcaaea82fd357121d0f1e6b76c7b || >=cf75ad8b41d2aa06f98f365d42a3ae8b059daddd <a642f498f0b08f2aa9f4a69468db92f57a72349d || >=cf75ad8b41d2aa06f98f365d42a3ae8b059daddd <8ed67535fdff40ca652bcd4ac7da68d11d01bd34 | 52edf1c0e59dea37b8368c4a2559dca96b2fdfea, 333257e6e4a7bcaaea82fd357121d0f1e6b76c7b, a642f498f0b08f2aa9f4a69468db92f57a72349d, 8ed67535fdff40ca652bcd4ac7da68d11d01bd34 |
| Linux/Linuxgeneric | 5.17 | Not reported |
| Linux/Linuxgeneric | >=cf75ad8b41d2aa06f98f365d42a3ae8b059daddd <ddc9edb244cc8b5266595e8fc220e7813f2b603a || >=cf75ad8b41d2aa06f98f365d42a3ae8b059daddd <52edf1c0e59dea37b8368c4a2559dca96b2fdfea || >=cf75ad8b41d2aa06f98f365d42a3ae8b059daddd <333257e6e4a7bcaaea82fd357121d0f1e6b76c7b || >=cf75ad8b41d2aa06f98f365d42a3ae8b059daddd <a642f498f0b08f2aa9f4a69468db92f57a72349d || >=cf75ad8b41d2aa06f98f365d42a3ae8b059daddd <8ed67535fdff40ca652bcd4ac7da68d11d01bd34 | ddc9edb244cc8b5266595e8fc220e7813f2b603a, 52edf1c0e59dea37b8368c4a2559dca96b2fdfea, 333257e6e4a7bcaaea82fd357121d0f1e6b76c7b, a642f498f0b08f2aa9f4a69468db92f57a72349d, 8ed67535fdff40ca652bcd4ac7da68d11d01bd34 |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
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.
Quoted source text, attributed separately from HOL analysis.