CVE-2024-56654

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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 \u2014 or a sandboxed Android app with Bluetooth access \u2014 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) \u2014 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"}}]}}

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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 \u2014 or a sandboxed Android app with Bluetooth access \u2014 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) \u2014 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. 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bluetooth/hci_event.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "0108132d7d76d884e443d18b4f067cdf2811911b", "status": "affected", "version": "a0bfde167b506423111ddb8cd71930497a40fc54", "versionType": "git"}, {"lessThan": "f9ecc90b5d501b3a5a62d0685d5104f934bb0104", "status": "affected", "version": "a0bfde167b506423111ddb8cd71930497a40fc54", "versionType": "git"}, {"lessThan": "581dd2dc168fe0ed2a7a5534a724f0d3751c93ae", "status": "affected", "version": "a0bfde167b506423111ddb8cd71930497a40fc54", "versionType": "git"}, {"status": "affected", "version": "b475c1109251e30ec21fb574d72a1c71a4ab0039", "versionType": "git"}, {"status": "affected", "version": "2ccde10127447c1a5caad8469fede945bdb62fdf", "versionType": "git"}, {"lessThan": "6.5", "status": "affected", "version": "6.4.16", "versionType": "semver"}, {"lessThan": "6.6", "status": "affected", "version": "6.5.3", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bluetooth/hci_event.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.6"}, {"lessThan": "6.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.67", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A5099559-2D15-42A5-A561-71B34FEFF36F", "versionEndExcluding": "6.5", "versionStartIncluding": "6.4.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F1CE7364-7396-4F17-8A39-45AB0F1A689E", "versionEndExcluding": "6.6.67", "versionStartIncluding": "6.5.3", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0CB1A9BB-F95E-43DD-A2FD-147912FD91E5", "versionEndExcluding": "6.12.6", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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();"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Bluetooth: hci_event: Se solucion\u00f3 el uso de rcu_read_(un)lock durante la iteraci\u00f3n El uso de rcu_read_(un)lock mientras se est\u00e1 dentro de list_for_each_entry_rcu no es seguro ya que en la mayor parte de los casos las entradas obtenidas de esta manera se tratar\u00e1n como rcu_dereference: Tenga en cuenta que el valor devuelto por rcu_dereference() solo es v\u00e1lido dentro de la secci\u00f3n cr\u00edtica del lado de lectura de RCU [1]_. Por ejemplo, lo siguiente **no** es legal:: rcu_read_lock(); p = rcu_dereference(head.next); rcu_read_unlock(); x = p->address; /* \u00a1ERROR! */ rcu_read_lock(); y = p->data; /* \u00a1ERROR! */ rcu_read_unlock();"}], "id": "CVE-2024-56654", "lastModified": "2026-08-04T11:22:18.380", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-56654", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T20:00:19.506429Z", "version": "2.0.3"}}]}, "published": "2024-12-27T15:15:25.237", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0108132d7d76d884e443d18b4f067cdf2811911b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/581dd2dc168fe0ed2a7a5534a724f0d3751c93ae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f9ecc90b5d501b3a5a62d0685d5104f934bb0104"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: Bluetooth: hci_event: Fix using rcu_read_(un)lock while iterating", "id": "2334563", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334563"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: hci_event: Fix using rcu_read_(un)lock while iterating\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:\nNote that the value returned by rcu_dereference() is valid\nonly within the enclosing RCU read-side critical section [1]_.\nFor example, the following is **not** legal::\nrcu_read_lock();\np = rcu_dereference(head.next);\nrcu_read_unlock();\nx = p->address;/* BUG!!! */\nrcu_read_lock();\ny = p->data;/* BUG!!! */\nrcu_read_unlock();"], "name": "CVE-2024-56654", "package_state": [{"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-12-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-56654\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-56654\nhttps://lore.kernel.org/linux-cve-announce/2024122749-CVE-2024-56654-66a1@gregkh/T"], "threat_severity": "Moderate"}

{}