CVE-2026-89774

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89774", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.765Z", "datePublished": "2026-09-16T08:24:21.248Z", "dateUpdated": "2026-09-16T14:38:26.042Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-16T14:38:26.042Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: SCO: hold sk properly in sco_conn_ready\n\nsk deref in sco_conn_ready must be done either under conn->lock, or\nholding a refcount, to avoid concurrent close. conn->sk and parent sk is\ncurrently accessed without either, and without checking parent->sk_state:\n\n [Task 1] [Task 2]\n sco_sock_release\n sco_conn_ready\n sk = conn->sk\n lock_sock(sk)\n conn->sk = NULL\n lock_sock(sk)\n release_sock(sk)\n sco_sock_kill(sk)\n UAF on sk deref\n\nand similarly for access to sco_get_sock_listen() return value.\n\nFix possible UAF by holding sk refcount in sco_conn_ready() and making\nsco_get_sock_listen() increase refcount. Also recheck after lock_sock\nthat the socket is still valid. Adjust conn->sk locking so it's\nprotected also by lock_sock() of the associated socket if any."}], "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 - sco_conn_ready runs from sco_connect_cfm via hci_connect_cfm on HCI Connection Complete, Synchronous Connection Complete, and deferred Connection Request for SCO/eSCO, driven by an in-range Bluetooth peer. Kernel CNA guidance classifies Bluetooth as Adjacent.\nAC:L - This is a use-after-free race between sco_conn_ready and sco_sock_release/sco_sock_kill. An attacker who times HCI SCO completion against socket close (rapid peer establish/teardown or concurrent connect/close) controls both sides and can retry until the window is hit; CONFIG_BT_BREDR defaults to y.\nPR:N - Incoming SCO is accepted when any listen socket exists (typical HFP/audio daemons on phones) with no Linux credentials required of the peer. sco_sock_create has no capability check, and listener close can occur from automatic bluetoothd/PipeWire teardown during connection setup.\nUI:N - No victim action is required at exploit time. OS Bluetooth audio stacks keep SCO listeners and manage sockets during normal headset, hands-free, and automotive operation while peer-initiated SCO/eSCO traffic is processed.\nS:U - The use-after-free corrupts in-kernel Bluetooth socket memory and can enable privilege escalation within the same host kernel security authority. It does not cross a VM, container, or IOMMU boundary.\nC:H - Use-after-free of struct sock after sco_sock_kill lets an attacker reclaim the freed slab object and read kernel memory through subsequent sock operations, which per CNA guidance is High confidentiality impact.\nI:H - sco_conn_ready writes sk->sk_state and makes an indirect call through sk->sk_state_change on the freed sock, a standard kernel heap UAF primitive for arbitrary write and control-flow hijack, scored High per UAF guidance.\nA:H - lock_sock and subsequent sk field access on a freed socket cause a kernel oops or panic. Per CNA guidance any use-after-free is High availability impact even before full exploitation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/sco.c"], "versions": [{"version": "27c24fda62b601d6f9ca5e992502578c4310876f", "lessThan": "50aae396dc30377bec8e3b181b8346f8fd38f7d8", "status": "affected", "versionType": "git"}, {"version": "27c24fda62b601d6f9ca5e992502578c4310876f", "lessThan": "6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1", "status": "affected", "versionType": "git"}, {"version": "27c24fda62b601d6f9ca5e992502578c4310876f", "lessThan": "d141d9b769bcd1b747898528c5023270cda040f2", "status": "affected", "versionType": "git"}, {"version": "27c24fda62b601d6f9ca5e992502578c4310876f", "lessThan": "73cb063f5ec6ca51eb1e246c6d332563002ac277", "status": "affected", "versionType": "git"}, {"version": "27c24fda62b601d6f9ca5e992502578c4310876f", "lessThan": "7199c78c3a3e399a4dc439d845826793880ccedc", "status": "affected", "versionType": "git"}, {"version": "27c24fda62b601d6f9ca5e992502578c4310876f", "lessThan": "4e37f6452d586b95c346a9abdd2fb80b67794f39", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bluetooth/sco.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "5.15", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/50aae396dc30377bec8e3b181b8346f8fd38f7d8"}, {"url": "https://git.kernel.org/stable/c/6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1"}, {"url": "https://git.kernel.org/stable/c/d141d9b769bcd1b747898528c5023270cda040f2"}, {"url": "https://git.kernel.org/stable/c/73cb063f5ec6ca51eb1e246c6d332563002ac277"}, {"url": "https://git.kernel.org/stable/c/7199c78c3a3e399a4dc439d845826793880ccedc"}, {"url": "https://git.kernel.org/stable/c/4e37f6452d586b95c346a9abdd2fb80b67794f39"}], "title": "Bluetooth: SCO: hold sk properly in sco_conn_ready", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bluetooth/sco.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "50aae396dc30377bec8e3b181b8346f8fd38f7d8", "status": "affected", "version": "27c24fda62b601d6f9ca5e992502578c4310876f", "versionType": "git"}, {"lessThan": "6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1", "status": "affected", "version": "27c24fda62b601d6f9ca5e992502578c4310876f", "versionType": "git"}, {"lessThan": "d141d9b769bcd1b747898528c5023270cda040f2", "status": "affected", "version": "27c24fda62b601d6f9ca5e992502578c4310876f", "versionType": "git"}, {"lessThan": "73cb063f5ec6ca51eb1e246c6d332563002ac277", "status": "affected", "version": "27c24fda62b601d6f9ca5e992502578c4310876f", "versionType": "git"}, {"lessThan": "7199c78c3a3e399a4dc439d845826793880ccedc", "status": "affected", "version": "27c24fda62b601d6f9ca5e992502578c4310876f", "versionType": "git"}, {"lessThan": "4e37f6452d586b95c346a9abdd2fb80b67794f39", "status": "affected", "version": "27c24fda62b601d6f9ca5e992502578c4310876f", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bluetooth/sco.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"lessThan": "5.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "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: SCO: hold sk properly in sco_conn_ready\n\nsk deref in sco_conn_ready must be done either under conn->lock, or\nholding a refcount, to avoid concurrent close. conn->sk and parent sk is\ncurrently accessed without either, and without checking parent->sk_state:\n\n [Task 1] [Task 2]\n sco_sock_release\n sco_conn_ready\n sk = conn->sk\n lock_sock(sk)\n conn->sk = NULL\n lock_sock(sk)\n release_sock(sk)\n sco_sock_kill(sk)\n UAF on sk deref\n\nand similarly for access to sco_get_sock_listen() return value.\n\nFix possible UAF by holding sk refcount in sco_conn_ready() and making\nsco_get_sock_listen() increase refcount. Also recheck after lock_sock\nthat the socket is still valid. Adjust conn->sk locking so it's\nprotected also by lock_sock() of the associated socket if any."}], "id": "CVE-2026-89774", "lastModified": "2026-09-16T15:18:06.747", "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"}]}, "published": "2026-09-16T09:17:07.717", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4e37f6452d586b95c346a9abdd2fb80b67794f39"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/50aae396dc30377bec8e3b181b8346f8fd38f7d8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7199c78c3a3e399a4dc439d845826793880ccedc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/73cb063f5ec6ca51eb1e246c6d332563002ac277"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d141d9b769bcd1b747898528c5023270cda040f2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[27c24fda62b601d6f9ca5e992502578c4310876f,50aae396dc30377bec8e3b181b8346f8fd38f7d8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[27c24fda62b601d6f9ca5e992502578c4310876f,6e3840578aaad1a296aab1eaaa89ea3b7d5cbae1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[27c24fda62b601d6f9ca5e992502578c4310876f,d141d9b769bcd1b747898528c5023270cda040f2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[27c24fda62b601d6f9ca5e992502578c4310876f,73cb063f5ec6ca51eb1e246c6d332563002ac277)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[27c24fda62b601d6f9ca5e992502578c4310876f,7199c78c3a3e399a4dc439d845826793880ccedc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[27c24fda62b601d6f9ca5e992502578c4310876f,4e37f6452d586b95c346a9abdd2fb80b67794f39)"}}], "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": "5.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "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": "2026-09-16T14:15:09.531733+00:00", "updated": "2026-09-20T06:15:07.026709+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416"]}