{ "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" } } } }