{"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"}}]}}