{"api_version":"1","generated_at":"2026-08-17T11:24:50+00:00","cve":"CVE-2026-74541","urls":{"html":"https://cve.report/CVE-2026-74541","api":"https://cve.report/api/cve/CVE-2026-74541.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74541","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74541"},"summary":{"title":"Bluetooth: ISO: clear iso_data always when detaching conn from hcon","description":"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().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:17:59","updated_at":"2026-08-17 06:19:51"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/d57e506f6a1e3929611340fae87c1e4823f4d85c","name":"https://git.kernel.org/stable/c/d57e506f6a1e3929611340fae87c1e4823f4d85c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/69a4a7b162b3db6ac337e3094cdee38f24d42ff7","name":"https://git.kernel.org/stable/c/69a4a7b162b3db6ac337e3094cdee38f24d42ff7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0","name":"https://git.kernel.org/stable/c/7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cc1d39946d62bc568551dfb81149724de1e91338","name":"https://git.kernel.org/stable/c/cc1d39946d62bc568551dfb81149724de1e91338","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/63c0f396a18b767eb28e895eb95bbdce6c172c59","name":"https://git.kernel.org/stable/c/63c0f396a18b767eb28e895eb95bbdce6c172c59","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74541","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74541","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbdc4bc47268953c80853489f696e02d61f9a2c6 cc1d39946d62bc568551dfb81149724de1e91338 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbdc4bc47268953c80853489f696e02d61f9a2c6 7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbdc4bc47268953c80853489f696e02d61f9a2c6 63c0f396a18b767eb28e895eb95bbdce6c172c59 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fbdc4bc47268953c80853489f696e02d61f9a2c6 69a4a7b162b3db6ac337e3094cdee38f24d42ff7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"74541","cve":"CVE-2026-74541","epss":"0.001680000","percentile":"0.064900000","score_date":"2026-08-16","updated_at":"2026-08-17 00:01:04"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/bluetooth/iso.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"cc1d39946d62bc568551dfb81149724de1e91338","status":"affected","version":"fbdc4bc47268953c80853489f696e02d61f9a2c6","versionType":"git"},{"lessThan":"7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0","status":"affected","version":"fbdc4bc47268953c80853489f696e02d61f9a2c6","versionType":"git"},{"lessThan":"63c0f396a18b767eb28e895eb95bbdce6c172c59","status":"affected","version":"fbdc4bc47268953c80853489f696e02d61f9a2c6","versionType":"git"},{"lessThan":"69a4a7b162b3db6ac337e3094cdee38f24d42ff7","status":"affected","version":"fbdc4bc47268953c80853489f696e02d61f9a2c6","versionType":"git"},{"lessThan":"d57e506f6a1e3929611340fae87c1e4823f4d85c","status":"affected","version":"fbdc4bc47268953c80853489f696e02d61f9a2c6","versionType":"git"},{"status":"affected","version":"c03a10bd5b6ccb22921e04bcddc987410df7e7a9","versionType":"git"},{"lessThan":"6.6","status":"affected","version":"6.5.12","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/bluetooth/iso.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":"6.6.151","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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.151","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.103","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.44","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.8","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5.12","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"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."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:48:29.921Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74541","datePublished":"2026-08-15T12:27:52.120Z","dateReserved":"2026-08-15T05:44:03.914Z","dateUpdated":"2026-08-17T05:48:29.921Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 13:17:59","lastModifiedDate":"2026-08-17 06:19:51","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74541","Ordinal":"1","Title":"Bluetooth: ISO: clear iso_data always when detaching conn from h","CVE":"CVE-2026-74541","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74541","Ordinal":"1","NoteData":"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().","Type":"Description","Title":"Bluetooth: ISO: clear iso_data always when detaching conn from h"}]}}}