{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98736", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.367Z", "datePublished": "2026-10-18T15:47:14.076Z", "dateUpdated": "2026-10-30T12:39:13.042Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:39:13.042Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: Lock parent access during enhanced SCO setup\n\nBluetooth: hci_conn: Lock parent access during enhanced SCO setup\n\nhci_enhanced_setup_sync() runs on the request workqueue without the\nhci_dev_lock held by its caller when setup was queued. Its CVSD\ncapability check and find_next_esco_param() dereference conn->parent\nwhile the receive workqueue can unlink and release that parent.\n\nThe following interleaving can cause a use-after-free:\n\n hci_enhanced_setup_sync() hci_disconn_complete_evt()\n load conn->parent\n hci_dev_lock()\n hci_conn_del(ACL parent)\n unlink SCO child\n drop link's parent reference\n clear child->parent\n release ACL parent\n bt_link_release()\n kfree(parent)\n hci_dev_unlock()\n read parent->features[0][3]\n\nThe reference held for the queued SCO child does not keep its ACL parent\nalive after unlinking. Commit 42de40abe25d (\"Bluetooth: hci_conn: fix the\nSCO setup context lifetime\") protects the child stored in the queued\ncontext, but leaves these parent accesses unprotected.\n\nWith a 40 ms diagnostic delay after loading conn->parent, an instrumented\nkernel based on fd179f8a05be, which already contains 42de40abe25d,\n\n BUG: KASAN: slab-use-after-free in hci_enhanced_setup_sync+0xda5/0xdf0\n Read of size 1 at addr ffff888102204047 by task kworker/u17:0/93\n Call Trace:\n hci_enhanced_setup_sync+0xda5/0xdf0\n hci_cmd_sync_work+0x13c/0x290\n process_one_work+0x6b4/0x10e0\n\n Allocated by task 92:\n __hci_conn_add+0x304/0x1df0\n hci_connect_acl+0x349/0x3e0\n hci_connect_sco+0x3b/0x9a0\n sco_sock_connect+0x475/0xca0\n\n Freed by task 94:\n kfree+0x121/0x3c0\n bt_link_release+0x79/0xa0\n device_release+0xc8/0x240\n kobject_put+0x14d/0x280\n hci_conn_del+0x524/0xe30\n hci_disconn_complete_evt+0x403/0x8c0\n hci_event_packet+0x71b/0xb20\n hci_rx_work+0x293/0x730\n\nThe accessed address is 71 bytes into the freed ACL parent, at its\nfeatures[0][3] byte; the queued SCO child is a different object. The\ndiagnostic preserves the loaded parent across the delay, matching the\nunmodified compiled capability check, and does not change the parent\nreferences or teardown path.\n\nHold hci_dev_lock() across the codec switch, including every call to\nfind_next_esco_param(), and release it on all selection errors. Keep\nconfigure_datapath_sync() outside the critical section because it waits\nfor HCI events. Preserve parameter selection and existing return values."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/hci_conn.c"], "versions": [{"version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "lessThan": "48bf3b94c7331e11eaa6c89adc054a7bc7c0382e", "status": "affected", "versionType": "git"}, {"version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "lessThan": "70b55855eecb428d446344d827bda8725ce8b312", "status": "affected", "versionType": "git"}, {"version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "lessThan": "1239ef0fa809b5952fca679db3faa3e1c00e1dac", "status": "affected", "versionType": "git"}, {"version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "lessThan": "cabd58d9bb66d49d481f762ce986173db397435d", "status": "affected", "versionType": "git"}, {"version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "lessThan": "93a737e4e042f59673cd580d35214f278d7b757d", "status": "affected", "versionType": "git"}, {"version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "lessThan": "024e05f73a4c1263d031614bc36700ec135eecb4", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/hci_conn.c"], "versions": [{"version": "6.1", "status": "affected"}, {"version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.10", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.18.56"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.2.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/48bf3b94c7331e11eaa6c89adc054a7bc7c0382e"}, {"url": "https://git.kernel.org/stable/c/70b55855eecb428d446344d827bda8725ce8b312"}, {"url": "https://git.kernel.org/stable/c/1239ef0fa809b5952fca679db3faa3e1c00e1dac"}, {"url": "https://git.kernel.org/stable/c/cabd58d9bb66d49d481f762ce986173db397435d"}, {"url": "https://git.kernel.org/stable/c/93a737e4e042f59673cd580d35214f278d7b757d"}, {"url": "https://git.kernel.org/stable/c/024e05f73a4c1263d031614bc36700ec135eecb4"}], "title": "Bluetooth: hci_conn: Lock parent access during enhanced SCO setup", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bluetooth/hci_conn.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "48bf3b94c7331e11eaa6c89adc054a7bc7c0382e", "status": "affected", "version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "versionType": "git"}, {"lessThan": "70b55855eecb428d446344d827bda8725ce8b312", "status": "affected", "version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "versionType": "git"}, {"lessThan": "1239ef0fa809b5952fca679db3faa3e1c00e1dac", "status": "affected", "version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "versionType": "git"}, {"lessThan": "cabd58d9bb66d49d481f762ce986173db397435d", "status": "affected", "version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "versionType": "git"}, {"lessThan": "93a737e4e042f59673cd580d35214f278d7b757d", "status": "affected", "version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "versionType": "git"}, {"lessThan": "024e05f73a4c1263d031614bc36700ec135eecb4", "status": "affected", "version": "e07a06b4eb417f5271d33ce2240e93c62d98b7b4", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bluetooth/hci_conn.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.1"}, {"lessThan": "6.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.56", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: Lock parent access during enhanced SCO setup\n\nBluetooth: hci_conn: Lock parent access during enhanced SCO setup\n\nhci_enhanced_setup_sync() runs on the request workqueue without the\nhci_dev_lock held by its caller when setup was queued. Its CVSD\ncapability check and find_next_esco_param() dereference conn->parent\nwhile the receive workqueue can unlink and release that parent.\n\nThe following interleaving can cause a use-after-free:\n\n hci_enhanced_setup_sync() hci_disconn_complete_evt()\n load conn->parent\n hci_dev_lock()\n hci_conn_del(ACL parent)\n unlink SCO child\n drop link's parent reference\n clear child->parent\n release ACL parent\n bt_link_release()\n kfree(parent)\n hci_dev_unlock()\n read parent->features[0][3]\n\nThe reference held for the queued SCO child does not keep its ACL parent\nalive after unlinking. Commit 42de40abe25d (\"Bluetooth: hci_conn: fix the\nSCO setup context lifetime\") protects the child stored in the queued\ncontext, but leaves these parent accesses unprotected.\n\nWith a 40 ms diagnostic delay after loading conn->parent, an instrumented\nkernel based on fd179f8a05be, which already contains 42de40abe25d,\n\n BUG: KASAN: slab-use-after-free in hci_enhanced_setup_sync+0xda5/0xdf0\n Read of size 1 at addr ffff888102204047 by task kworker/u17:0/93\n Call Trace:\n hci_enhanced_setup_sync+0xda5/0xdf0\n hci_cmd_sync_work+0x13c/0x290\n process_one_work+0x6b4/0x10e0\n\n Allocated by task 92:\n __hci_conn_add+0x304/0x1df0\n hci_connect_acl+0x349/0x3e0\n hci_connect_sco+0x3b/0x9a0\n sco_sock_connect+0x475/0xca0\n\n Freed by task 94:\n kfree+0x121/0x3c0\n bt_link_release+0x79/0xa0\n device_release+0xc8/0x240\n kobject_put+0x14d/0x280\n hci_conn_del+0x524/0xe30\n hci_disconn_complete_evt+0x403/0x8c0\n hci_event_packet+0x71b/0xb20\n hci_rx_work+0x293/0x730\n\nThe accessed address is 71 bytes into the freed ACL parent, at its\nfeatures[0][3] byte; the queued SCO child is a different object. The\ndiagnostic preserves the loaded parent across the delay, matching the\nunmodified compiled capability check, and does not change the parent\nreferences or teardown path.\n\nHold hci_dev_lock() across the codec switch, including every call to\nfind_next_esco_param(), and release it on all selection errors. Keep\nconfigure_datapath_sync() outside the critical section because it waits\nfor HCI events. Preserve parameter selection and existing return values."}], "id": "CVE-2026-98736", "lastModified": "2026-10-30T13:21:22.400", "metrics": {}, "published": "2026-10-18T16:17:27.237", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/024e05f73a4c1263d031614bc36700ec135eecb4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1239ef0fa809b5952fca679db3faa3e1c00e1dac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/48bf3b94c7331e11eaa6c89adc054a7bc7c0382e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/70b55855eecb428d446344d827bda8725ce8b312"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/93a737e4e042f59673cd580d35214f278d7b757d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cabd58d9bb66d49d481f762ce986173db397435d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Bluetooth: hci_conn: Lock parent access during enhanced SCO setup", "id": "2555090", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555090"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: hci_conn: Lock parent access during enhanced SCO setup\nBluetooth: hci_conn: Lock parent access during enhanced SCO setup\nhci_enhanced_setup_sync() runs on the request workqueue without the\nhci_dev_lock held by its caller when setup was queued. Its CVSD\ncapability check and find_next_esco_param() dereference conn->parent\nwhile the receive workqueue can unlink and release that parent.\nThe following interleaving can cause a use-after-free:\nhci_enhanced_setup_sync() hci_disconn_complete_evt()\nload conn->parent\nhci_dev_lock()\nhci_conn_del(ACL parent)\nunlink SCO child\ndrop link's parent reference\nclear child->parent\nrelease ACL parent\nbt_link_release()\nkfree(parent)\nhci_dev_unlock()\nread parent->features[0][3]\nThe reference held for the queued SCO child does not keep its ACL parent\nalive after unlinking. Commit 42de40abe25d (\"Bluetooth: hci_conn: fix the\nSCO setup context lifetime\") protects the child stored in the queued\ncontext, but leaves these parent accesses unprotected.\nWith a 40 ms diagnostic delay after loading conn->parent, an instrumented\nkernel based on fd179f8a05be, which already contains 42de40abe25d,\nBUG: KASAN: slab-use-after-free in hci_enhanced_setup_sync+0xda5/0xdf0\nRead of size 1 at addr ffff888102204047 by task kworker/u17:0/93\nCall Trace:\nhci_enhanced_setup_sync+0xda5/0xdf0\nhci_cmd_sync_work+0x13c/0x290\nprocess_one_work+0x6b4/0x10e0\nAllocated by task 92:\n__hci_conn_add+0x304/0x1df0\nhci_connect_acl+0x349/0x3e0\nhci_connect_sco+0x3b/0x9a0\nsco_sock_connect+0x475/0xca0\nFreed by task 94:\nkfree+0x121/0x3c0\nbt_link_release+0x79/0xa0\ndevice_release+0xc8/0x240\nkobject_put+0x14d/0x280\nhci_conn_del+0x524/0xe30\nhci_disconn_complete_evt+0x403/0x8c0\nhci_event_packet+0x71b/0xb20\nhci_rx_work+0x293/0x730\nThe accessed address is 71 bytes into the freed ACL parent, at its\nfeatures[0][3] byte; the queued SCO child is a different object. The\ndiagnostic preserves the loaded parent across the delay, matching the\nunmodified compiled capability check, and does not change the parent\nreferences or teardown path.\nHold hci_dev_lock() across the codec switch, including every call to\nfind_next_esco_param(), and release it on all selection errors. Keep\nconfigure_datapath_sync() outside the critical section because it waits\nfor HCI events. Preserve parameter selection and existing return values.", "A flaw was found in the Linux kernel's Bluetooth subsystem. A race condition occurs during enhanced Synchronous Connection-Oriented (SCO) link setup due to missing locking when accessing parent connection structures. A local user or adjacent attacker could exploit this timing window by concurrently disconnecting the link, causing a use-after-free condition. This flaw could lead to a Denial of Service (DoS) via a system crash or potentially arbitrary code execution."], "name": "CVE-2026-98736", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98736\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98736\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98736.mbox"], "threat_severity": "Moderate"}