CVE-2026-74541

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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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74541", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:59:46.525127Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:54.748Z"}}]}}

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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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "fbdc4bc47268953c80853489f696e02d61f9a2c6", "lessThan": 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{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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()."}], "id": "CVE-2026-74541", "lastModified": "2026-10-16T20:17:36.590", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74541", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:59:46.525127Z", "version": "2.0.3"}}]}, "published": "2026-08-15T13:17:59.443", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/63c0f396a18b767eb28e895eb95bbdce6c172c59"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/69a4a7b162b3db6ac337e3094cdee38f24d42ff7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cc1d39946d62bc568551dfb81149724de1e91338"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d57e506f6a1e3929611340fae87c1e4823f4d85c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Bluetooth: ISO: clear iso_data always when detaching conn from hcon", "id": "2517039", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517039"}, "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": ["In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: ISO: clear iso_data always when detaching conn from hcon\nWhen setting conn->hcon = NULL, also conn->hcon->iso_data = NULL is\nnecessary, otherwise later iso_conn_free() will UAF.\nFix clearing of iso_data in iso_sock_disconn()\nFixes KASAN: slab-use-after-free in iso_conn_hold_unless_zero on\niso_sock_release() followed by hci_abort_conn_sync().", "A flaw was found in the Linux kernel's Bluetooth ISO subsystem. This vulnerability arises from the system's failure to properly clear `iso_data` when a connection is detached from its host controller connection (`hcon`). A local attacker could exploit this use-after-free condition to cause a denial of service or potentially achieve arbitrary code execution."], "name": "CVE-2026-74541", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "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-2026-74541\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74541\nhttps://lore.kernel.org/linux-cve-announce/2026081548-CVE-2026-74541-99b5@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fbdc4bc47268953c80853489f696e02d61f9a2c6,cc1d39946d62bc568551dfb81149724de1e91338)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fbdc4bc47268953c80853489f696e02d61f9a2c6,7b51a9c25e9698b64df9f2218f10eecf7dc7e2d0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fbdc4bc47268953c80853489f696e02d61f9a2c6,63c0f396a18b767eb28e895eb95bbdce6c172c59)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fbdc4bc47268953c80853489f696e02d61f9a2c6,69a4a7b162b3db6ac337e3094cdee38f24d42ff7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fbdc4bc47268953c80853489f696e02d61f9a2c6,d57e506f6a1e3929611340fae87c1e4823f4d85c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "c03a10bd5b6ccb22921e04bcddc987410df7e7a9"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.5.12,6.6)"}}], "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": "6.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "6.6.151,<=6.6.*"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "6.12.103,<=6.12.*"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "6.18.44,<=6.18.*"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "7.1.8,<=7.1.*"}}, {"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": "2026-08-15T14:30:10.511895+00:00", "updated": "2026-08-21T19:30:05.194784+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-825"]}