{ "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": "2026-10-21T12:56:12.287Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:56:12.287Z" }, "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": "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": "6.6.160", "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": "6.6.160" }, { "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/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" } } } }