{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74528", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.912Z", "datePublished": "2026-08-15T12:27:44.181Z", "dateUpdated": "2026-08-17T05:48:17.804Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:48:17.804Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_past_sync() callback\n\nAvoids giving freed pointers to hci_conn_valid(), which kmalloc may have\nreused.\n\nHold refcount to avoid that."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - The bug is in Bluetooth LE PAST handling reached via ISO socket bind() rebind; exploitation requires an active LE connection to an adjacent peer and the freeing race is routinely won by concurrent local disconnects or a remote BLE link teardown, matching the CNA Bluetooth-adjacent threat model for phones and laptops in radio range.\nAC:L - An attacker controls both sides of the race by calling bind() to queue hci_past_sync() while concurrently closing the ISO socket or tearing down the looked-up LE link; repeated attempts can reliably free hci_conn objects before the hci_cmd_sync work callback runs without uncontrollable layout or timing dependencies.\nPR:L - Once the ISO socket layer is active (typically enabled by bluetoothd at boot), any unprivileged local user can open AF_BLUETOOTH SOCK_SEQPACKET ISO sockets and invoke the vulnerable bind() rebind path without CAP_NET_ADMIN; Bluetooth sockets are restricted to init_net and are not available through user namespaces.\nUI:N - Exploitation is driven entirely by the attacker's own socket operations and coordinated disconnects; no action by another user or administrator (pairing prompts, mounting, or opening files) is required beyond normal Bluetooth being enabled on the host.\nS:U - The use-after-free corrupts kernel heap objects and enables standard local kernel privilege escalation within the same security authority; it does not cross VM, hypervisor, or IOMMU boundaries.\nC:H - Without refcounting, freed hci_conn pointers are passed to hci_conn_valid(); if kmalloc reuses the slab for another hci_conn the check can succeed and the callback reads handle, sync_handle, and iso_qos fields from attacker-influenced freed/reused memory, giving UAF-based kernel information disclosure.\nI:H - Slab reuse of the freed hci_conn lets an attacker shape heap contents so stale pointer dereferences and subsequent HCI PAST commands operate on attacker-controlled data, providing the memory corruption and arbitrary-write primitives typical of kernel use-after-free exploitation.\nA:H - Use-after-free on hci_conn structures in hci_cmd_sync work can cause KASAN slab-use-after-free reports, kernel oopses, or panics when freed memory is reused or corrupted, and misdirected PAST HCI commands can additionally disrupt or wedge Bluetooth connectivity on the host."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/hci_sync.c"], "versions": [{"version": "d3413703d5f8b7d1e6f514f9440ed5da1bc30796", "lessThan": "e6792adef614b389141b142e30ee549e4a47dd7d", "status": "affected", "versionType": "git"}, {"version": "d3413703d5f8b7d1e6f514f9440ed5da1bc30796", "lessThan": "abf9753edf3f88282c44a605f3945d8d4f8dd86c", "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_sync.c"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.19", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e6792adef614b389141b142e30ee549e4a47dd7d"}, {"url": "https://git.kernel.org/stable/c/abf9753edf3f88282c44a605f3945d8d4f8dd86c"}], "title": "Bluetooth: hci_sync: hold conn in hci_past_sync() callback", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bluetooth/hci_sync.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e6792adef614b389141b142e30ee549e4a47dd7d", "status": "affected", "version": "d3413703d5f8b7d1e6f514f9440ed5da1bc30796", "versionType": "git"}, {"lessThan": "abf9753edf3f88282c44a605f3945d8d4f8dd86c", "status": "affected", "version": "d3413703d5f8b7d1e6f514f9440ed5da1bc30796", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bluetooth/hci_sync.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.19"}, {"lessThan": "6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: hold conn in hci_past_sync() callback\n\nAvoids giving freed pointers to hci_conn_valid(), which kmalloc may have\nreused.\n\nHold refcount to avoid that."}], "id": "CVE-2026-74528", "lastModified": "2026-08-17T06:19:49.660", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T13:17:58.083", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/abf9753edf3f88282c44a605f3945d8d4f8dd86c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e6792adef614b389141b142e30ee549e4a47dd7d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Bluetooth: hci_sync: hold conn in hci_past_sync() callback", "id": "2517100", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517100"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's Bluetooth subsystem. This vulnerability, a use-after-free, occurs when the hci_sync component improperly handles connection references, leading to the potential reuse and access of freed memory pointers. A remote attacker could exploit this to cause system instability, resulting in a denial of service (DoS), or potentially achieve privilege escalation."], "name": "CVE-2026-74528", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74528\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74528\nhttps://lore.kernel.org/linux-cve-announce/2026081546-CVE-2026-74528-dc1d@gregkh/T"], "threat_severity": "Moderate"}