CVE-2026-89569 (GCVE-0-2026-89569)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-19 08:49
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: serialize security confirmation handling rfcomm_security_cfm() looks up a session on session_list and then walks its DLC list without holding rfcomm_mutex. Since RFCOMM session teardown uses rfcomm_mutex, krfcommd can close and free the same session and DLCs concurrently: hci_rx_work krfcommd ----------- --------- rfcomm_session_get() rfcomm_lock() rfcomm_session_close() rfcomm_dlc_unlink() rfcomm_session_del() kfree(s) rfcomm_unlock() walk s->dlcs The callback can then read a freed session list head and touch freed DLCs while updating their flags or timers. Serialize the session lookup and DLC traversal in rfcomm_security_cfm() with rfcomm_mutex. This matches the existing RFCOMM session lifetime rules and prevents concurrent rfcomm_session_del() / rfcomm_dlc_unlink() from tearing the objects down while the callback is using them. KASAN reported: BUG: KASAN: slab-use-after-free in rfcomm_security_cfm+0x41c/0x440 Read of size 8 at addr ffff888111fb3960 by task kworker/u17:1/89 Workqueue: hci0 hci_rx_work Call Trace: rfcomm_security_cfm+0x41c/0x440 hci_encrypt_cfm+0x139/0x590 hci_encrypt_change_evt+0x37b/0xc40 hci_event_packet+0x71b/0xb20 hci_rx_work+0x293/0x730 Allocated by task 69: rfcomm_session_add+0x9e/0x2f0 rfcomm_run+0x44b/0x41e0 Freed by task 69: kfree+0x131/0x3c0 rfcomm_session_del+0x188/0x220 rfcomm_run+0x1985/0x41e0
References
Impacted products
Vendor Product Version
Linux Linux Version: 08c30aca9e698faddebd34f81e1196295f9dc063
Version: 08c30aca9e698faddebd34f81e1196295f9dc063
Version: 08c30aca9e698faddebd34f81e1196295f9dc063
Version: 08c30aca9e698faddebd34f81e1196295f9dc063
Version: 08c30aca9e698faddebd34f81e1196295f9dc063
Version: 08c30aca9e698faddebd34f81e1196295f9dc063
Version: 08c30aca9e698faddebd34f81e1196295f9dc063
Version: 08c30aca9e698faddebd34f81e1196295f9dc063
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: serialize security confirmation handling\n\nrfcomm_security_cfm() looks up a session on session_list and then walks\nits DLC list without holding rfcomm_mutex. Since RFCOMM session teardown\nuses rfcomm_mutex, krfcommd can close and free the same session and DLCs\nconcurrently:\n\n  hci_rx_work                    krfcommd\n  -----------                    ---------\n  rfcomm_session_get()\n                                 rfcomm_lock()\n                                 rfcomm_session_close()\n                                   rfcomm_dlc_unlink()\n                                   rfcomm_session_del()\n                                     kfree(s)\n                                 rfcomm_unlock()\n  walk s-\u003edlcs\n\nThe callback can then read a freed session list head and touch freed DLCs\nwhile updating their flags or timers.\n\nSerialize the session lookup and DLC traversal in rfcomm_security_cfm()\nwith rfcomm_mutex. This matches the existing RFCOMM session lifetime\nrules and prevents concurrent rfcomm_session_del() / rfcomm_dlc_unlink()\nfrom tearing the objects down while the callback is using them.\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in rfcomm_security_cfm+0x41c/0x440\n  Read of size 8 at addr ffff888111fb3960 by task kworker/u17:1/89\n  Workqueue: hci0 hci_rx_work\n  Call Trace:\n   rfcomm_security_cfm+0x41c/0x440\n   hci_encrypt_cfm+0x139/0x590\n   hci_encrypt_change_evt+0x37b/0xc40\n   hci_event_packet+0x71b/0xb20\n   hci_rx_work+0x293/0x730\n  Allocated by task 69:\n   rfcomm_session_add+0x9e/0x2f0\n   rfcomm_run+0x44b/0x41e0\n  Freed by task 69:\n   kfree+0x131/0x3c0\n   rfcomm_session_del+0x188/0x220\n   rfcomm_run+0x1985/0x41e0"
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              "value": "AV:A - rfcomm_security_cfm() runs from hci_encrypt_cfm()/hci_auth_cfm() on hci_rx_work when the controller reports encryption or authentication complete. An in-range Bluetooth peer that opens an RFCOMM/L2CAP session can drive those HCI events; kernel CNA guidance scores Bluetooth as Adjacent.\nAC:L - The UAF is a race between hci_rx_work walking the session and krfcommd freeing it. A peer controls both sides by triggering encrypt/auth complete while disconnecting RFCOMM/L2CAP or the ACL link so krfcommd runs rfcomm_session_close(), and can retry until the window is hit.\nPR:N - A nearby Bluetooth device needs no Linux account or capability. krfcommd listens on L2CAP PSM RFCOMM at default BT_SECURITY_LOW, and HCI encrypt/auth complete (including failures) call rfcomm_security_cfm() with no local credential check.\nUI:N - Phones, cars, and IoT devices with Bluetooth enabled accept RFCOMM/L2CAP and emit encrypt-change events during ordinary link setup or teardown. No extra victim action such as pairing confirmation, mounting, or opening a file is required at exploit time.\nS:U - The UAF corrupts kernel RFCOMM session and DLC objects in the host Bluetooth stack. It does not cross a VM, IOMMU, or other security-authority boundary.\nC:H - After rfcomm_session_del() frees the session, the callback reads the slab-freed list head and DLC flags, state, and sec_level. Kernel UAF of these objects enables heap reuse and arbitrary kernel read primitives.\nI:H - The callback writes DLC flag bits and arms or cancels DLC timers on objects krfcommd may already have unlinked and freed, so a reused slab object can be corrupted or have its timer hijacked for control-flow takeover.\nA:H - KASAN reported slab-use-after-free in rfcomm_security_cfm() on hci_rx_work; triggering the race oopses or panics the kernel even without a full exploit."
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    "cveId": "CVE-2026-89569",
    "datePublished": "2026-09-11T19:44:38.838Z",
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    "dateUpdated": "2026-10-19T08:49:02.628Z",
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An in-range Bluetooth peer that opens an RFCOMM/L2CAP session can drive those HCI events; kernel CNA guidance scores Bluetooth as Adjacent.\\nAC:L - The UAF is a race between hci_rx_work walking the session and krfcommd freeing it. A peer controls both sides by triggering encrypt/auth complete while disconnecting RFCOMM/L2CAP or the ACL link so krfcommd runs rfcomm_session_close(), and can retry until the window is hit.\\nPR:N - A nearby Bluetooth device needs no Linux account or capability. krfcommd listens on L2CAP PSM RFCOMM at default BT_SECURITY_LOW, and HCI encrypt/auth complete (including failures) call rfcomm_security_cfm() with no local credential check.\\nUI:N - Phones, cars, and IoT devices with Bluetooth enabled accept RFCOMM/L2CAP and emit encrypt-change events during ordinary link setup or teardown. 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Kernel UAF of these objects enables heap reuse and arbitrary kernel read primitives.\\nI:H - The callback writes DLC flag bits and arms or cancels DLC timers on objects krfcommd may already have unlinked and freed, so a reused slab object can be corrupted or have its timer hijacked for control-flow takeover.\\nA:H - KASAN reported slab-use-after-free in rfcomm_security_cfm() on hci_rx_work; triggering the race oopses or panics the kernel even without a full exploit.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\", \"lessThan\": \"62ce8b33eb238cf18c15207332fbdc26d858f592\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\", \"lessThan\": \"3873f3449701b3dc98cba577923be6493598e7a1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\", \"lessThan\": \"7ded3264106418c6456ccceaafd9fda596ce12c3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\", \"lessThan\": \"82425b14f0fb22e46cfddc56d6465570f5ed0ce6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\", \"lessThan\": \"1b7841ffad08e911e8c4b9470f3fa08423568940\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\", \"lessThan\": \"946d76db77ee5f922968ce558629ae47b381e3fc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\", \"lessThan\": \"fbf7961964a6e93360179f64712320ae9a1e9577\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"08c30aca9e698faddebd34f81e1196295f9dc063\", \"lessThan\": \"759c185d0bbdb131357408f50b8735e04ed3caff\", \"versionType\": \"git\"}], \"programFiles\": [\"net/bluetooth/rfcomm/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\": \"3.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.270\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.221\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.188\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.109\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.50\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.2.*\"}, {\"status\": \"unaffected\", \"version\": \"7.3\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/bluetooth/rfcomm/core.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/62ce8b33eb238cf18c15207332fbdc26d858f592\"}, {\"url\": \"https://git.kernel.org/stable/c/3873f3449701b3dc98cba577923be6493598e7a1\"}, {\"url\": \"https://git.kernel.org/stable/c/7ded3264106418c6456ccceaafd9fda596ce12c3\"}, {\"url\": \"https://git.kernel.org/stable/c/82425b14f0fb22e46cfddc56d6465570f5ed0ce6\"}, {\"url\": \"https://git.kernel.org/stable/c/1b7841ffad08e911e8c4b9470f3fa08423568940\"}, {\"url\": \"https://git.kernel.org/stable/c/946d76db77ee5f922968ce558629ae47b381e3fc\"}, {\"url\": \"https://git.kernel.org/stable/c/fbf7961964a6e93360179f64712320ae9a1e9577\"}, {\"url\": \"https://git.kernel.org/stable/c/759c185d0bbdb131357408f50b8735e04ed3caff\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: RFCOMM: serialize security confirmation handling\\n\\nrfcomm_security_cfm() looks up a session on session_list and then walks\\nits DLC list without holding rfcomm_mutex. Since RFCOMM session teardown\\nuses rfcomm_mutex, krfcommd can close and free the same session and DLCs\\nconcurrently:\\n\\n  hci_rx_work                    krfcommd\\n  -----------                    ---------\\n  rfcomm_session_get()\\n                                 rfcomm_lock()\\n                                 rfcomm_session_close()\\n                                   rfcomm_dlc_unlink()\\n                                   rfcomm_session_del()\\n                                     kfree(s)\\n                                 rfcomm_unlock()\\n  walk s-\u003edlcs\\n\\nThe callback can then read a freed session list head and touch freed DLCs\\nwhile updating their flags or timers.\\n\\nSerialize the session lookup and DLC traversal in rfcomm_security_cfm()\\nwith rfcomm_mutex. This matches the existing RFCOMM session lifetime\\nrules and prevents concurrent rfcomm_session_del() / rfcomm_dlc_unlink()\\nfrom tearing the objects down while the callback is using them.\\n\\nKASAN reported:\\n\\n  BUG: KASAN: slab-use-after-free in rfcomm_security_cfm+0x41c/0x440\\n  Read of size 8 at addr ffff888111fb3960 by task kworker/u17:1/89\\n  Workqueue: hci0 hci_rx_work\\n  Call Trace:\\n   rfcomm_security_cfm+0x41c/0x440\\n   hci_encrypt_cfm+0x139/0x590\\n   hci_encrypt_change_evt+0x37b/0xc40\\n   hci_event_packet+0x71b/0xb20\\n   hci_rx_work+0x293/0x730\\n  Allocated by task 69:\\n   rfcomm_session_add+0x9e/0x2f0\\n   rfcomm_run+0x44b/0x41e0\\n  Freed by task 69:\\n   kfree+0x131/0x3c0\\n   rfcomm_session_del+0x188/0x220\\n   rfcomm_run+0x1985/0x41e0\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"3.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"3.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:49:02.628Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-89569\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:49:02.628Z\", \"dateReserved\": \"2026-09-11T19:38:34.726Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:44:38.838Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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