Answer in brief
CVE-2026-98735 records a Unknown severity vulnerability in Bluetooth: hci_core: Serialize ACL scheduling with channel deletion. 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 | >=3eff45eaf81780dad25c167bbaafa7d25ae407da <51f95ea451f25d7e3f048c0f438f04fa74688aae || >=3eff45eaf81780dad25c167bbaafa7d25ae407da <86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd || >=3eff45eaf81780dad25c167bbaafa7d25ae407da <4fda8f0abeea9929036446d89a476fb8298abcb0 || >=3eff45eaf81780dad25c167bbaafa7d25ae407da <f4845ab191a4f686a5da481fbba90ed73bb693b0 | 51f95ea451f25d7e3f048c0f438f04fa74688aae, 86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd, 4fda8f0abeea9929036446d89a476fb8298abcb0, f4845ab191a4f686a5da481fbba90ed73bb693b0 |
| Linux/Linuxgeneric | 3.3 | Not reported |
| Linux/Linuxgeneric | >=3eff45eaf81780dad25c167bbaafa7d25ae407da <780affacd92977fd9b819bdc4f26a6832cb27fda || >=3eff45eaf81780dad25c167bbaafa7d25ae407da <51f95ea451f25d7e3f048c0f438f04fa74688aae || >=3eff45eaf81780dad25c167bbaafa7d25ae407da <86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd || >=3eff45eaf81780dad25c167bbaafa7d25ae407da <4fda8f0abeea9929036446d89a476fb8298abcb0 || >=3eff45eaf81780dad25c167bbaafa7d25ae407da <f4845ab191a4f686a5da481fbba90ed73bb693b0 | 780affacd92977fd9b819bdc4f26a6832cb27fda, 51f95ea451f25d7e3f048c0f438f04fa74688aae, 86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd, 4fda8f0abeea9929036446d89a476fb8298abcb0, f4845ab191a4f686a5da481fbba90ed73bb693b0 |
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_core: Serialize ACL scheduling with channel deletion hci_chan_sent() selects a channel under RCU but drops the read lock before accessing chan->conn and returning the channel. The ACL and LE schedulers then use its packet queue and update its transmit counters without any protection against channel deletion. After TX selects a channel and releases RCU, a disconnect command timeout on the separate request workqueue can run hci_conn_failed() and l2cap_conn_del(). hci_chan_del() can then unlink the channel, complete synchronize_rcu(), purge its queue and free it before TX resumes. This causes use-after-free both in hci_chan_sent() and in its callers. KASAN reported: BUG: KASAN: slab-use-after-free in hci_chan_sent+0x892/0x9b0 Workqueue: hci0 hci_tx_work Call Trace: hci_chan_sent+0x892/0x9b0 hci_tx_work+0x5e6/0xb70 Allocated by task 91: hci_chan_create+0xe3/0x350 l2cap_conn_add.part.0+0x12/0xa30 l2cap_chan_connect+0x110d/0x1b60 l2cap_sock_connect+0x310/0x530 Freed by task 99: hci_chan_del+0x11f/0x170 l2cap_conn_del+0x4f1/0x800 l2cap_connect_cfm+0x88c/0xd30 hci_conn_failed+0x150/0x250 hci_abort_conn_sync+0x3e3/0x800 hci_cmd_sync_run+0x7e/0xc0 hci_abort_conn+0x105/0x1f0 disconnect_sync+0x157/0x290 hci_cmd_sync_work+0x13c/0x290 Hold the existing device mutex across channel selection and transmission in both schedulers to serialize them with channel teardown. Keep timeout handling outside the critical sections because hci_link_tx_to() acquires the same mutex. This also permits the transmit path to sleep, unlike extending the RCU read-side critical section across packet submission.
Quoted source text, attributed separately from HOL analysis.