{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-56654", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-27T15:00:39.841Z", "datePublished": "2024-12-27T15:06:18.224Z", "dateUpdated": "2026-08-05T11:45:52.018Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:45:52.018Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_event: Fix using rcu_read_(un)lock while iterating\n\nThe usage of rcu_read_(un)lock while inside list_for_each_entry_rcu is\nnot safe since for the most part entries fetched this way shall be\ntreated as rcu_dereference:\n\n\tNote that the value returned by rcu_dereference() is valid\n\tonly within the enclosing RCU read-side critical section [1]_.\n\tFor example, the following is **not** legal::\n\n\t\trcu_read_lock();\n\t\tp = rcu_dereference(head.next);\n\t\trcu_read_unlock();\n\t\tx = p->address;\t/* BUG!!! */\n\t\trcu_read_lock();\n\t\ty = p->data;\t/* BUG!!! */\n\t\trcu_read_unlock();" } ], "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 vulnerable event handler runs in response to an HCI_LE_Create_BIG command that the local host issues only when a local process creates broadcast ISO sockets via the AF_BLUETOOTH/BTPROTO_ISO syscall interface. BIG creation involves no remote peer, so the attacker must have local system access.\nAC:L - The attacker fully controls both the number of bound BIS connections and the QoS parameters that determine whether the controller returns a failing Create BIG status, and the freed pointer is dereferenced deterministically by the loop's increment step on every failed BIG creation. Heap grooming to control the reallocated hci_conn contents is done from the attacker's own threads.\nPR:L - iso_sock_create(), iso_sock_bind(), and iso_sock_connect() perform no capable() checks, so any unprivileged local user — or a sandboxed Android app with Bluetooth access — can bind and connect the ISO sockets that drive the vulnerable path. No CAP_NET_ADMIN or root is needed to reach the bug.\nUI:N - The entire sequence is driven by the attacker's own socket, setsockopt, bind, and connect calls. No victim action or interaction is required.\nS:U - The use-after-free corrupts kernel heap memory and is exploited within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale RCU pointer is read from a freed, attacker-sprayable hci_conn slab object, and the resulting pointer is dereferenced at multiple offsets (dst, type, iso_qos), yielding an arbitrary kernel-memory read primitive. The unbounded ev->bis_handle[i++] indexing adds an additional out-of-bounds read.\nI:H - After the free the loop writes through the attacker-controlled pointer (conn->state assignment and set_bit on conn->flags) and calls hci_conn_del(), which invokes conn->cleanup(conn) — an indirect call through an attacker-supplied function pointer, giving arbitrary write and control-flow hijack.\nA:H - Iterating from a kfree'd list node reliably produces a wild-pointer dereference, KASAN splat, or kernel panic even without successful heap grooming. The crash is triggerable on demand by any local user." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hci_event.c" ], "versions": [ { "version": "a0bfde167b506423111ddb8cd71930497a40fc54", "lessThan": "0108132d7d76d884e443d18b4f067cdf2811911b", "status": "affected", "versionType": "git" }, { "version": "a0bfde167b506423111ddb8cd71930497a40fc54", "lessThan": "f9ecc90b5d501b3a5a62d0685d5104f934bb0104", "status": "affected", "versionType": "git" }, { "version": "a0bfde167b506423111ddb8cd71930497a40fc54", "lessThan": "581dd2dc168fe0ed2a7a5534a724f0d3751c93ae", "status": "affected", "versionType": "git" }, { "version": "b475c1109251e30ec21fb574d72a1c71a4ab0039", "status": "affected", "versionType": "git" }, { "version": "2ccde10127447c1a5caad8469fede945bdb62fdf", "status": "affected", "versionType": "git" }, { "version": "6.4.16", "lessThan": "6.5", "status": "affected", "versionType": "semver" }, { "version": "6.5.3", "lessThan": "6.6", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hci_event.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.67", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.6", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "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": "6.6", "versionEndExcluding": "6.6.67" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0108132d7d76d884e443d18b4f067cdf2811911b" }, { "url": "https://git.kernel.org/stable/c/f9ecc90b5d501b3a5a62d0685d5104f934bb0104" }, { "url": "https://git.kernel.org/stable/c/581dd2dc168fe0ed2a7a5534a724f0d3751c93ae" } ], "title": "Bluetooth: hci_event: Fix using rcu_read_(un)lock while iterating", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-56654", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2025-10-01T20:00:19.506429Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "description": "CWE-noinfo Not enough information" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:07:11.020Z" } } ] } }