{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74531", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.912Z", "datePublished": "2026-08-15T12:27:45.988Z", "dateUpdated": "2026-08-23T12:47:34.295Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:47:34.295Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: hold conn reference in abort_conn_sync()\n\nThere is theoretical UAF if the conn is freed while the hci_sync task is\nrunning.\n\nHold refcount to avoid that."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - The flaw is in the Bluetooth HCI connection abort path reachable when a nearby attacker sends connection, authentication-failure, or disconnect traffic that drives hci_disconnect()/hci_abort_conn() through hci_event processing.\nAC:L - An adjacent attacker can repeatedly initiate, fail, and tear down connections to race asynchronous abort_conn_sync work against hci_conn_del(), controlling both sides of the timing window without depending on uncontrollable system state.\nPR:N - Exploitation requires no local account or kernel privileges; a remote Bluetooth peer within RF range can trigger hci_abort_conn() via standard HCI event handling without authenticated pairing or CAP_NET_ADMIN access.\nUI:N - No deliberate victim action beyond normal Bluetooth availability is required; exploitation works against discoverable/connectable devices and already-paired reconnections without opening files or confirming a one-off prompt.\nS:U - Impact is kernel heap corruption and potential privilege escalation within the host kernel security boundary, not a cross-boundary escape such as VM guest-to-host or IOMMU bypass.\nC:H - Use-after-free of struct hci_conn lets an attacker read freed slab memory through abort_conn_sync/hci_abort_conn_sync field accesses, enabling disclosure of kernel pointers and adjacent heap contents.\nI:H - UAF of hci_conn is heap memory corruption that can be shaped via slab reuse and exploited for arbitrary kernel writes or control-flow hijack, not merely a bounded data change.\nA:H - Accessing a freed hci_conn during abort_conn_sync can cause kernel oops, BUG, or panic, and UAF corruption can crash or hang the system even when full exploitation is not attempted."}]}], "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": "249c88e7fb45b6b705040c5af4bd0d0f2bc9735c", "lessThan": "64d1645f26aa49b5a86ba2fccd0bb6749ea725a6", "status": "affected", "versionType": "git"}, {"version": "227a0cdf4a028a73dc256d0f5144b4808d718893", "lessThan": "963fb4b8e7d1ab07b4ae45bf15d41e667c88caca", "status": "affected", "versionType": "git"}, {"version": "227a0cdf4a028a73dc256d0f5144b4808d718893", "lessThan": "e8f9fef362bab431d95371d3406bc720350290c3", "status": "affected", "versionType": "git"}, {"version": "227a0cdf4a028a73dc256d0f5144b4808d718893", "lessThan": "fa812cfa81aa3d4a7b6ce8277979af57b3f79712", "status": "affected", "versionType": "git"}, {"version": "227a0cdf4a028a73dc256d0f5144b4808d718893", "lessThan": "5761d003daa987ac81463f570713ce9c9dd204e5", "status": "affected", "versionType": "git"}, {"version": "7fe4d391e937c2f048a43ff4b421e677f10d83c0", "status": "affected", "versionType": "git"}, {"version": "58afdc9b18871eb1d461c725be9e9f3f44a39aeb", "status": "affected", "versionType": "git"}, {"version": "6.6.51", "lessThan": "6.6.151", "status": "affected", "versionType": "semver"}, {"version": "6.1.184", "lessThan": "6.2", "status": "affected", "versionType": "semver"}, {"version": "6.10.10", "lessThan": "6.11", "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_conn.c"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "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": "6.6.51", "versionEndExcluding": "6.6.151"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.12.103"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.184"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10.10"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/64d1645f26aa49b5a86ba2fccd0bb6749ea725a6"}, {"url": "https://git.kernel.org/stable/c/963fb4b8e7d1ab07b4ae45bf15d41e667c88caca"}, {"url": "https://git.kernel.org/stable/c/e8f9fef362bab431d95371d3406bc720350290c3"}, {"url": "https://git.kernel.org/stable/c/fa812cfa81aa3d4a7b6ce8277979af57b3f79712"}, {"url": "https://git.kernel.org/stable/c/5761d003daa987ac81463f570713ce9c9dd204e5"}], "title": "Bluetooth: hci_conn: hold conn reference in abort_conn_sync()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bluetooth/hci_conn.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "64d1645f26aa49b5a86ba2fccd0bb6749ea725a6", "status": "affected", "version": "249c88e7fb45b6b705040c5af4bd0d0f2bc9735c", "versionType": "git"}, {"lessThan": "963fb4b8e7d1ab07b4ae45bf15d41e667c88caca", "status": "affected", "version": "227a0cdf4a028a73dc256d0f5144b4808d718893", "versionType": "git"}, {"lessThan": "e8f9fef362bab431d95371d3406bc720350290c3", "status": "affected", "version": "227a0cdf4a028a73dc256d0f5144b4808d718893", "versionType": "git"}, {"lessThan": "fa812cfa81aa3d4a7b6ce8277979af57b3f79712", "status": "affected", "version": "227a0cdf4a028a73dc256d0f5144b4808d718893", "versionType": "git"}, {"lessThan": "5761d003daa987ac81463f570713ce9c9dd204e5", "status": "affected", "version": "227a0cdf4a028a73dc256d0f5144b4808d718893", "versionType": "git"}, {"status": "affected", "version": "7fe4d391e937c2f048a43ff4b421e677f10d83c0", "versionType": "git"}, {"status": "affected", "version": "58afdc9b18871eb1d461c725be9e9f3f44a39aeb", "versionType": "git"}, {"lessThan": "6.6.151", "status": "affected", "version": "6.6.51", "versionType": "semver"}, {"lessThan": "6.2", "status": "affected", "version": "6.1.184", "versionType": "semver"}, {"lessThan": "6.11", "status": "affected", "version": "6.10.10", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bluetooth/hci_conn.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.11"}, {"lessThan": "6.11", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.151", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.103", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "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_conn: hold conn reference in abort_conn_sync()\n\nThere is theoretical UAF if the conn is freed while the hci_sync task is\nrunning.\n\nHold refcount to avoid that."}], "id": "CVE-2026-74531", "lastModified": "2026-08-23T13:16:45.710", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T13:17:58.397", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5761d003daa987ac81463f570713ce9c9dd204e5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/64d1645f26aa49b5a86ba2fccd0bb6749ea725a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/963fb4b8e7d1ab07b4ae45bf15d41e667c88caca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e8f9fef362bab431d95371d3406bc720350290c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fa812cfa81aa3d4a7b6ce8277979af57b3f79712"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Bluetooth: hci_conn: hold conn reference in abort_conn_sync()", "id": "2516964", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516964"}, "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": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: hci_conn: hold conn reference in abort_conn_sync()\nThere is theoretical UAF if the conn is freed while the hci_sync task is\nrunning.\nHold refcount to avoid that.", "A flaw was found in the Bluetooth `hci_conn` component of the Linux kernel. A theoretical Use-After-Free (UAF) vulnerability exists if a connection (`conn`) is prematurely freed while the `hci_sync` task is still active. This could potentially allow an attacker to cause a system crash or execute arbitrary code."], "name": "CVE-2026-74531", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "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-2026-74531\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74531\nhttps://lore.kernel.org/linux-cve-announce/2026081546-CVE-2026-74531-0354@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[249c88e7fb45b6b705040c5af4bd0d0f2bc9735c,64d1645f26aa49b5a86ba2fccd0bb6749ea725a6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[227a0cdf4a028a73dc256d0f5144b4808d718893,963fb4b8e7d1ab07b4ae45bf15d41e667c88caca)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[227a0cdf4a028a73dc256d0f5144b4808d718893,e8f9fef362bab431d95371d3406bc720350290c3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[227a0cdf4a028a73dc256d0f5144b4808d718893,fa812cfa81aa3d4a7b6ce8277979af57b3f79712)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[227a0cdf4a028a73dc256d0f5144b4808d718893,5761d003daa987ac81463f570713ce9c9dd204e5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "58afdc9b18871eb1d461c725be9e9f3f44a39aeb"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.51,6.6.151)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.10.10,6.11)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.151,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.103,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.44,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.8,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc6,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T14:45:03.920624+00:00", "updated": "2026-08-21T19:45:03.266760+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-825"]}