{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46111", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.098Z", "datePublished": "2026-05-28T09:35:19.970Z", "dateUpdated": "2026-08-19T16:28:01.615Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:28:01.615Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in create_big_sync\n\nAdd hci_conn_valid() check in create_big_sync() to detect stale\nconnections before proceeding with BIG creation. Handle the\nresulting -ECANCELED in create_big_complete() and re-validate the\nconnection under hci_dev_lock() before dereferencing, matching the\npattern used by create_le_conn_complete() and create_pa_complete().\n\nKeep the hci_conn object alive across the async boundary by taking\na reference via hci_conn_get() when queueing create_big_sync(), and\ndropping it in the completion callback. The refcount and the lock\nare complementary: the refcount keeps the object allocated, while\nhci_dev_lock() serializes hci_conn_hash_del()'s list_del_rcu() on\nhdev->conn_hash, as required by hci_conn_del().\n\nhci_conn_put() is called outside hci_dev_unlock() so the final put\n(which resolves to kfree() via bt_link_release) does not run under\nhdev->lock, though the release path would be safe either way.\n\nWithout this, create_big_complete() would unconditionally\ndereference the conn pointer on error, causing a use-after-free\nvia hci_connect_cfm() and hci_conn_del()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The UAF is reached only through a local ISO socket connect() syscall (BTPROTO_ISO → iso_connect_bis → hci_connect_bis); BIG broadcast setup is locally initiated and requires no Bluetooth peer or over-the-air frame, so the attacker needs local system access.\nAC:L - This is a use-after-free where the attacker controls both sides of the race — initiating the async create_big work via connect() and freeing the conn (e.g., closing the socket) — and can retry at will, so the condition is within attacker control.\nPR:L - Creating and connecting an ISO socket requires no capability check (iso_sock_create/bt_sock_create perform none), so any unprivileged local user can reach the path on systems where the ISO/BIS feature is enabled.\nUI:N - The attacker performs all steps (open socket, connect, race a teardown); no victim interaction is required.\nS:U - The use-after-free is contained within the kernel's own memory/security authority and does not cross into another security boundary such as a VM or IOMMU domain.\nC:H - A UAF of the hci_conn object gives the attacker control over the freed object's contents, enabling kernel-memory disclosure (e.g., leaking pointers/data placed in the reclaimed allocation).\nI:H - The freed hci_conn is dereferenced and written via hci_connect_cfm() and hci_conn_del() (including list_del_rcu on conn_hash), so heap grooming of the freed slab yields an arbitrary-write/control-flow primitive.\nA:H - Dereferencing and deleting a freed hci_conn reliably causes memory corruption leading to a kernel oops/panic." } ] } ], "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": "eca0ae4aea66914515e5e3098ea051b518ee5316", "lessThan": "d41093723e47255d7d74df86e2736711c1b8486e", "status": "affected", "versionType": "git" }, { "version": "eca0ae4aea66914515e5e3098ea051b518ee5316", "lessThan": "6823f730bf195fc296d9edd09e2ca94bc1ff5584", "status": "affected", "versionType": "git" }, { "version": "eca0ae4aea66914515e5e3098ea051b518ee5316", "lessThan": "1750a2df0eab61dc421a7afae74abdd239a44b85", "status": "affected", "versionType": "git" }, { "version": "eca0ae4aea66914515e5e3098ea051b518ee5316", "lessThan": "dc34f8d8240f25dd137dc2758ebbcc75e3779142", "status": "affected", "versionType": "git" }, { "version": "eca0ae4aea66914515e5e3098ea051b518ee5316", "lessThan": "f8eaf92c57ad99358dd372580d5ff87623343a72", "status": "affected", "versionType": "git" }, { "version": "eca0ae4aea66914515e5e3098ea051b518ee5316", "lessThan": "0beddb0c380bed5f5b8e61ddbe14635bb73d0b41", "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": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.140", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.90", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.32", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.7", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "6.0", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.12.90" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.18.32" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.0.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d41093723e47255d7d74df86e2736711c1b8486e" }, { "url": "https://git.kernel.org/stable/c/6823f730bf195fc296d9edd09e2ca94bc1ff5584" }, { "url": "https://git.kernel.org/stable/c/1750a2df0eab61dc421a7afae74abdd239a44b85" }, { "url": "https://git.kernel.org/stable/c/dc34f8d8240f25dd137dc2758ebbcc75e3779142" }, { "url": "https://git.kernel.org/stable/c/f8eaf92c57ad99358dd372580d5ff87623343a72" }, { "url": "https://git.kernel.org/stable/c/0beddb0c380bed5f5b8e61ddbe14635bb73d0b41" } ], "title": "Bluetooth: hci_conn: fix potential UAF in create_big_sync", "x_generator": { "engine": "bippy-1.2.0" } } } }