{ "cveId": "CVE-2026-98735", "url": "https://patchblox.com/security/cve/CVE-2026-98735", "summary": "CVE-2026-98735 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2026-98735, released October 19, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "Bluetooth: hci_core: Serialize ACL scheduling with channel deletion", "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-\u003Econn 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\u002B0x892/0x9b0 Workqueue: hci0 hci_tx_work Call Trace: hci_chan_sent\u002B0x892/0x9b0 hci_tx_work\u002B0x5e6/0xb70 Allocated by task 91: hci_chan_create\u002B0xe3/0x350 l2cap_conn_add.part.0\u002B0x12/0xa30 l2cap_chan_connect\u002B0x110d/0x1b60 l2cap_sock_connect\u002B0x310/0x530 Freed by task 99: hci_chan_del\u002B0x11f/0x170 l2cap_conn_del\u002B0x4f1/0x800 l2cap_connect_cfm\u002B0x88c/0xd30 hci_conn_failed\u002B0x150/0x250 hci_abort_conn_sync\u002B0x3e3/0x800 hci_cmd_sync_run\u002B0x7e/0xc0 hci_abort_conn\u002B0x105/0x1f0 disconnect_sync\u002B0x157/0x290 hci_cmd_sync_work\u002B0x13c/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.", "published": "2026-10-18T16:17:27Z", "severity": "Important", "cvss": 7.5, "epss": 0.00177, "epssPercentile": 0.07255, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98735", "fixes": [ { "platform": "linux", "product": "kernel-64kb", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-azure", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-default", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-default-base", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1.150700.17.51.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-docs", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-livepatch-SLE15-SP7_Update_24", "release": "sles 15.7", "fixedVersion": "1-150700.15.3.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-obs-build", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-source", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-syms", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "kernel-zfcpdump", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", "fix": "SUSE-SU-2026:5091-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-5091-1", "released": "2026-11-07T00:43:02Z" }, { "platform": "linux", "product": "linux", "release": "Debian 13.5 (trixie)", "fixedVersion": "6.12.113-1", "fix": "DEBIAN-CVE-2026-98735", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98735", "released": "2026-10-19T16:27:52Z" }, { "platform": "linux", "product": "linux", "release": "Debian 14", "fixedVersion": "7.2.10-1", "fix": "DEBIAN-CVE-2026-98735", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98735", "released": "2026-10-19T16:27:52Z" }, { "platform": "linux", "product": "linux-6.12", "release": "Debian 12.15 (bookworm)", "fixedVersion": "6.12.113-1~deb12u1", "fix": "DEBIAN-CVE-2026-98735", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98735", "released": "2026-10-19T16:27:52Z" } ], "noFixYet": [], "dataAsOf": "2026-11-08T06:59:42Z", "attribution": { "text": "Data: Patchblox Patch Radar", "url": "https://patchblox.com/security/patch-radar", "terms": "https://patchblox.com/security/patch-radar/use-the-data" } }