{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74541", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.914Z", "datePublished": "2026-08-15T12:27:52.120Z", "dateUpdated": "2026-08-17T05:48:29.921Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:48:29.921Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: clear iso_data always when detaching conn from hcon\n\nWhen setting conn->hcon = NULL, also conn->hcon->iso_data = NULL is\nnecessary, otherwise later iso_conn_free() will UAF.\n\nFix clearing of iso_data in iso_sock_disconn()\n\nFixes KASAN: slab-use-after-free in iso_conn_hold_unless_zero on\niso_sock_release() followed by hci_abort_conn_sync()." } ], "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 ISO stack (net/bluetooth/iso.c); exploitation occurs during ISO connection teardown reachable from adjacent Bluetooth LE Audio/CIS/BIS deployments on phones, laptops, and embedded systems where ISO HCI traffic is processed wirelessly.\nAC:L - The KASAN reproducer (iso_sock_release() then hci_abort_conn_sync()) is reliably triggered by closing an ISO socket while hci_conn_drop() runs; the attacker controls both the socket lifecycle and concurrent teardown timing without depending on uncontrollable memory layout.\nPR:N - AF_BLUETOOTH/BTPROTO_ISO sockets require no CAP_NET_ADMIN or CAP_NET_RAW; any unprivileged process in init_net can open, connect, and close ISO sockets, and adjacent Bluetooth peers can also dereference the stale hcon->iso_data via iso_recv() without host credentials.\nUI:N - No victim interaction is required when a malicious or compromised local process creates and closes its own ISO connection to trigger iso_sock_disconn(); exploitation does not depend on mounting filesystems or opening specific user files.\nS:U - The UAF corrupts kernel heap memory during ISO connection teardown, enabling standard local privilege escalation within the kernel security boundary rather than crossing VM, container, or IOMMU isolation boundaries.\nC:H - iso_conn_hold_unless_zero() performs kref_get_unless_zero() on a freed iso_conn slab object, a classic use-after-free that can expose adjacent kernel heap contents and be leveraged for arbitrary kernel memory disclosure.\nI:H - The UAF on iso_conn (containing kref, spinlock, and socket pointers) enables heap spraying and memory corruption primitives that can be chained for arbitrary kernel writes and control-flow hijacking.\nA:H - The bug was confirmed by KASAN as a slab use-after-free in iso_conn_hold_unless_zero during ISO socket release and hci_abort_conn_sync(), which causes kernel oops or panic and denial of service on affected systems." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/iso.c" ], "versions": [ { "version": "fbdc4bc47268953c80853489f696e02d61f9a2c6", "lessThan": "cc1d39946d62bc568551dfb81149724de1e91338", "status": "affected", "versionType": "git" }, { "version": "fbdc4bc47268953c80853489f696e02d61f9a2c6", "lessThan": "7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0", "status": "affected", "versionType": "git" }, { "version": "fbdc4bc47268953c80853489f696e02d61f9a2c6", "lessThan": "63c0f396a18b767eb28e895eb95bbdce6c172c59", "status": "affected", "versionType": "git" }, { "version": "fbdc4bc47268953c80853489f696e02d61f9a2c6", "lessThan": "69a4a7b162b3db6ac337e3094cdee38f24d42ff7", "status": "affected", "versionType": "git" }, { "version": "fbdc4bc47268953c80853489f696e02d61f9a2c6", "lessThan": "d57e506f6a1e3929611340fae87c1e4823f4d85c", "status": "affected", "versionType": "git" }, { "version": "c03a10bd5b6ccb22921e04bcddc987410df7e7a9", "status": "affected", "versionType": "git" }, { "version": "6.5.12", "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/iso.c" ], "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "lessThan": "6.6", "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", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cc1d39946d62bc568551dfb81149724de1e91338" }, { "url": "https://git.kernel.org/stable/c/7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0" }, { "url": "https://git.kernel.org/stable/c/63c0f396a18b767eb28e895eb95bbdce6c172c59" }, { "url": "https://git.kernel.org/stable/c/69a4a7b162b3db6ac337e3094cdee38f24d42ff7" }, { "url": "https://git.kernel.org/stable/c/d57e506f6a1e3929611340fae87c1e4823f4d85c" } ], "title": "Bluetooth: ISO: clear iso_data always when detaching conn from hcon", "x_generator": { "engine": "bippy-1.2.0" } } } }