{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74535", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.913Z", "datePublished": "2026-08-15T12:27:48.449Z", "dateUpdated": "2026-10-16T19:05:53.982Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:48:24.441Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: avoid deadlocks in iso_sock_timeout\n\niso_sock_timeout() takes lock_sock, so sync disabling the timer while\nholding that lock may deadlock.\n\niso_sock_timeout() may also run concurrently with iso_conn_del(), which\nleads to UAF\n\n [Task 1] [Task hdev->workqueue]\n iso_sock_timeout iso_conn_del\n iso_conn_hold_unless_zero iso_chan_del\n `------------> iso_conn_put\n caller frees hcon\n iso_conn_put\n iso_conn_free\n conn->hcon->iso_data = NULL; /* UAF */\n\nFix the deadlock by removing the disable from the lock_sock sections.\nMove the timer from iso_conn to iso_pinfo to decouple it from iso_conn\nwhich may need to be freed in lock_sock section. Convert some of the\nclear_timer to disable_timer." } ], "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 bug is in the Bluetooth ISO socket layer (BTPROTO_ISO); iso_sock_timeout and iso_conn_del are reached via HCI disconnect/connect events from an adjacent BLE peer and local ISO socket syscalls, which per kernel guidance is Adjacent not Network.\nAC:L - Exploitation is a race between iso_sock_timeout and iso_conn_del that an attacker can reliably force by controlling ISO connect/disconnect timing and socket send timeouts (SO_SNDTIMEO) on concurrent workqueues, so success does not depend on uncontrollable conditions.\nPR:N - An adjacent Bluetooth attacker can trigger iso_conn_del through remote HCI disconnect/failure events without any credentials or privileges on the victim host; only a normal active or pending ISO/LE Audio session must exist on the target.\nUI:N - No deliberate victim interaction beyond routine Bluetooth/LE Audio operation is required; exploitation can occur in the background while an ISO connection is pending or active, without opening files or performing a separate enabling action.\nS:U - The UAF/deadlock corrupts kernel heap memory on the host and enables local privilege escalation within the kernel security boundary, not a cross-boundary escape such as VM guest-to-host or IOMMU bypass.\nC:H - iso_conn_free dereferences conn->hcon after concurrent iso_conn_del frees the hci_conn (UAF on conn->hcon->iso_data), enabling arbitrary kernel memory read/disclosure through heap corruption per UAF guidance.\nI:H - The UAF permits writes through conn->hcon->iso_data and hci_conn_drop on freed hci_conn memory, providing heap corruption primitives that can be leveraged for arbitrary kernel writes or code execution.\nA:H - The UAF causes kernel oops/panic on freed hci_conn access, and the lock_sock versus disable_delayed_work_sync deadlock in iso_sock_timeout/iso_conn_del paths can hang the system; both crash and deadlock map to High availability impact." } ] } ], "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": "a58d0f5dac322e16cc75334d000666512341bde5", "lessThan": "16d89a63e08280abeef7218970a3bbd7ca62b021", "status": "affected", "versionType": "git" }, { "version": "dc26097bdb864a0d5955b9a25e43376ffc1af99b", "lessThan": "82e982f54f962f72646868ddbb2c3bd9ea178568", "status": "affected", "versionType": "git" }, { "version": "dc26097bdb864a0d5955b9a25e43376ffc1af99b", "lessThan": "3c3d5f85db80145636bb991a6005e2760012b985", "status": "affected", "versionType": "git" }, { "version": "dc26097bdb864a0d5955b9a25e43376ffc1af99b", "lessThan": "200fa1629c57a3ca2b03d3ca63fd3a9bfd910c43", "status": "affected", "versionType": "git" }, { "version": "f53e7489273dc2bb307bf50f319b3762d45534f0", "status": "affected", "versionType": "git" }, { "version": "6.12.2", "lessThan": "6.12.103", "status": "affected", "versionType": "semver" }, { "version": "6.11.11", "lessThan": "6.12", "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": "6.13", "status": "affected" }, { "version": "0", "lessThan": "6.13", "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": "6.12.2", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/16d89a63e08280abeef7218970a3bbd7ca62b021" }, { "url": "https://git.kernel.org/stable/c/82e982f54f962f72646868ddbb2c3bd9ea178568" }, { "url": "https://git.kernel.org/stable/c/3c3d5f85db80145636bb991a6005e2760012b985" }, { "url": "https://git.kernel.org/stable/c/200fa1629c57a3ca2b03d3ca63fd3a9bfd910c43" } ], "title": "Bluetooth: ISO: avoid deadlocks in iso_sock_timeout", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-74535", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T18:59:30.482999Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:53.982Z" } } ] } }