CVE-2026-98735Bluetooth: hci_core: Serialize ACL scheduling with channel deletion
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 23 days later
· 23 days later
Published
- 12 days later
· 12 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 3eff45eaf81780dad25c167bbaafa7d25ae407da – < 126714c495bf31a5e71411b8e0b65a685bb5e58d
- affected 3eff45eaf81780dad25c167bbaafa7d25ae407da – < 7fbeda3dcd5f54e7429f4b5e2cfa7344b7e9b1c9
- affected 3eff45eaf81780dad25c167bbaafa7d25ae407da – < 74667f6eb7c12b65c56e02e0f527e4099db4ebfd
- affected 3eff45eaf81780dad25c167bbaafa7d25ae407da – < 780affacd92977fd9b819bdc4f26a6832cb27fda
- affected 3eff45eaf81780dad25c167bbaafa7d25ae407da – < 51f95ea451f25d7e3f048c0f438f04fa74688aae
- affected 3eff45eaf81780dad25c167bbaafa7d25ae407da – < 86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd
- affected 3eff45eaf81780dad25c167bbaafa7d25ae407da – < 4fda8f0abeea9929036446d89a476fb8298abcb0
- affected 3eff45eaf81780dad25c167bbaafa7d25ae407da – < f4845ab191a4f686a5da481fbba90ed73bb693b0
- affected 3.3
- unaffected < 3.3
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.224 – ≤ 5.15.*
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.113 – ≤ 6.12.*
- unaffected 6.18.56 – ≤ 6.18.*
- unaffected 7.2.10 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/126714c495bf31a5e71411b8e0b65a685bb5e58d (opens in a new tab)
- https://git.kernel.org/stable/c/7fbeda3dcd5f54e7429f4b5e2cfa7344b7e9b1c9 (opens in a new tab)
- https://git.kernel.org/stable/c/74667f6eb7c12b65c56e02e0f527e4099db4ebfd (opens in a new tab)
- https://git.kernel.org/stable/c/780affacd92977fd9b819bdc4f26a6832cb27fda (opens in a new tab)
- https://git.kernel.org/stable/c/51f95ea451f25d7e3f048c0f438f04fa74688aae (opens in a new tab)
- https://git.kernel.org/stable/c/86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd (opens in a new tab)
- https://git.kernel.org/stable/c/4fda8f0abeea9929036446d89a476fb8298abcb0 (opens in a new tab)
- https://git.kernel.org/stable/c/f4845ab191a4f686a5da481fbba90ed73bb693b0 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-103820 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-98735)Record last updated .