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Bluetooth: hci_core: Serialize ACL scheduling with channel deletion

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

CVE-2026-98735

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98735

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da",
        "lessThan": "780affacd92977fd9b819bdc4f26a6832cb27fda",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da",
        "lessThan": "51f95ea451f25d7e3f048c0f438f04fa74688aae",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da",
        "lessThan": "86e9708f9d19a7f1bd5dc9c1652d07707f79f5bd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da",
        "lessThan": "4fda8f0abeea9929036446d89a476fb8298abcb0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3eff45eaf81780dad25c167bbaafa7d25ae407da",
        "lessThan": "f4845ab191a4f686a5da481fbba90ed73bb693b0",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bluetooth/hci_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.56",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/hci_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98735

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#48934 · Revision 1
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