CVE-2026-53358

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The timeout handler already acquires conn->lock\nand chan->lock in the correct order.\n\nThe timer is only armed when chan->conn is still set: if it is\nalready NULL, l2cap_conn_del() has already processed this channel\n(l2cap_chan_del + l2cap_sock_teardown_cb + l2cap_sock_close_cb),\nso there is nothing left to do. If l2cap_conn_del() races in\nafter the timer is armed, __clear_chan_timer() inside\nl2cap_chan_del() cancels it; if the timer has already fired, the\nhandler returns harmlessly because chan->conn was cleared."}], "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 vulnerable L2CAP child channels are created and torn down through Bluetooth BR/EDR or LE signaling from a nearby peer, so the remote reachability is adjacent. Bluetooth is not generally Internet-routable, but phones, embedded devices, and kiosks commonly expose this surface to nearby attackers.\nAC:L - The bug is a race, but the attacker can repeatedly create queued L2CAP children and trigger disconnect/cleanup timing; related reports show the listen/close versus HCI-disconnect race reproducing reliably. Under the required rule, the attacker-controlled repeatable race is scored Low complexity.\nPR:N - A nearby Bluetooth peer can reach L2CAP connection setup before application authentication, including low-security/SDP-style services, without an OS account on the target. If a local service lifecycle participates in cleanup, that is target state rather than attacker privilege.\nUI:N - No victim user action such as opening a file or accepting a prompt is required once Bluetooth and a listening L2CAP service are present. The attacker can drive the Bluetooth connection and disconnect attempts directly.\nS:U - The corruption occurs inside the Linux kernel Bluetooth stack and impacts the same kernel security authority. There is no VM escape, IOMMU bypass, or cross-authority boundary change indicated.\nC:H - The old path called l2cap_chan_close() without conn->lock, allowing unlocked removal from conn->chan_l and races with l2cap_conn_del() over sock/l2cap_chan lifetime. This is kernel memory corruption/UAF-adjacent behavior, which is defensibly exploitable for high confidentiality impact.\nI:H - The race can corrupt kernel list/refcount state around l2cap_chan and sock teardown, giving a plausible route to use-after-free style heap manipulation. Kernel memory corruption is scored as high integrity impact under the provided guidance.\nA:H - At minimum, racing channel cleanup and connection deletion can cause list corruption, double teardown, UAF, KASAN splats, oops, or panic. A repeatable kernel crash is 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/l2cap_sock.c"], "versions": [{"version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "3634cbdc2eb414b69ffa752ddbe5e0458518e321", "status": "affected", "versionType": "git"}, {"version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "e1c100e2d61bd8c718b7d91fe3e050780a9bf72d", "status": "affected", "versionType": "git"}, {"version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9", "status": "affected", "versionType": "git"}, {"version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "89dec92041717b027216e110599e4f6d6c921b79", "status": "affected", "versionType": "git"}, {"version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "50dfec218808b148ab4247b1858031b7a32015c5", "status": "affected", "versionType": "git"}, {"version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "859d3ace791ed878ae9ba5522c7844d960da8f88", "status": "affected", "versionType": "git"}, {"version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "7555fd885a0603f50e49a655850a1f2bd8a25398", "status": "affected", "versionType": "git"}, {"version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "8c8e620467a7b51562dbcefbd1f09f288d7d710d", "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/l2cap_sock.c"], "versions": [{"version": "3.4", "status": "affected"}, {"version": "0", "lessThan": "3.4", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, 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"7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3634cbdc2eb414b69ffa752ddbe5e0458518e321"}, {"url": "https://git.kernel.org/stable/c/e1c100e2d61bd8c718b7d91fe3e050780a9bf72d"}, {"url": "https://git.kernel.org/stable/c/deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9"}, {"url": "https://git.kernel.org/stable/c/89dec92041717b027216e110599e4f6d6c921b79"}, {"url": "https://git.kernel.org/stable/c/50dfec218808b148ab4247b1858031b7a32015c5"}, {"url": "https://git.kernel.org/stable/c/859d3ace791ed878ae9ba5522c7844d960da8f88"}, {"url": "https://git.kernel.org/stable/c/7555fd885a0603f50e49a655850a1f2bd8a25398"}, {"url": "https://git.kernel.org/stable/c/8c8e620467a7b51562dbcefbd1f09f288d7d710d"}], "title": "Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": 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Bluetooth is not generally Internet-routable, but phones, embedded devices, and kiosks commonly expose this surface to nearby attackers.\nAC:L - The bug is a race, but the attacker can repeatedly create queued L2CAP children and trigger disconnect/cleanup timing; related reports show the listen/close versus HCI-disconnect race reproducing reliably. Under the required rule, the attacker-controlled repeatable race is scored Low complexity.\nPR:N - A nearby Bluetooth peer can reach L2CAP connection setup before application authentication, including low-security/SDP-style services, without an OS account on the target. If a local service lifecycle participates in cleanup, that is target state rather than attacker privilege.\nUI:N - No victim user action such as opening a file or accepting a prompt is required once Bluetooth and a listening L2CAP service are present. The attacker can drive the Bluetooth connection and disconnect attempts directly.\nS:U - The corruption occurs inside the Linux kernel Bluetooth stack and impacts the same kernel security authority. There is no VM escape, IOMMU bypass, or cross-authority boundary change indicated.\nC:H - The old path called l2cap_chan_close() without conn->lock, allowing unlocked removal from conn->chan_l and races with l2cap_conn_del() over sock/l2cap_chan lifetime. This is kernel memory corruption/UAF-adjacent behavior, which is defensibly exploitable for high confidentiality impact.\nI:H - The race can corrupt kernel list/refcount state around l2cap_chan and sock teardown, giving a plausible route to use-after-free style heap manipulation. Kernel memory corruption is scored as high integrity impact under the provided guidance.\nA:H - At minimum, racing channel cleanup and connection deletion can cause list corruption, double teardown, UAF, KASAN splats, oops, or panic. A repeatable kernel crash is high availability impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "3634cbdc2eb414b69ffa752ddbe5e0458518e321", "versionType": "git"}, {"status": "affected", "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "e1c100e2d61bd8c718b7d91fe3e050780a9bf72d", "versionType": "git"}, {"status": "affected", "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9", "versionType": "git"}, {"status": "affected", "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "89dec92041717b027216e110599e4f6d6c921b79", "versionType": "git"}, {"status": "affected", "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "50dfec218808b148ab4247b1858031b7a32015c5", "versionType": "git"}, {"status": "affected", "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "859d3ace791ed878ae9ba5522c7844d960da8f88", "versionType": "git"}, {"status": "affected", "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "7555fd885a0603f50e49a655850a1f2bd8a25398", "versionType": "git"}, {"status": "affected", "version": "3df91ea20e744344100b10ae69a17211fcf5b207", "lessThan": "8c8e620467a7b51562dbcefbd1f09f288d7d710d", "versionType": "git"}], "programFiles": ["net/bluetooth/l2cap_sock.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.4"}, {"status": "unaffected", "version": "0", "lessThan": "3.4", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.259", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.93", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.35", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.12", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/bluetooth/l2cap_sock.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/3634cbdc2eb414b69ffa752ddbe5e0458518e321"}, {"url": "https://git.kernel.org/stable/c/e1c100e2d61bd8c718b7d91fe3e050780a9bf72d"}, {"url": "https://git.kernel.org/stable/c/deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9"}, {"url": "https://git.kernel.org/stable/c/89dec92041717b027216e110599e4f6d6c921b79"}, {"url": "https://git.kernel.org/stable/c/50dfec218808b148ab4247b1858031b7a32015c5"}, {"url": "https://git.kernel.org/stable/c/859d3ace791ed878ae9ba5522c7844d960da8f88"}, {"url": "https://git.kernel.org/stable/c/7555fd885a0603f50e49a655850a1f2bd8a25398"}, {"url": "https://git.kernel.org/stable/c/8c8e620467a7b51562dbcefbd1f09f288d7d710d"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: use chan timer to close channels in cleanup_listen()\n\nl2cap_chan_close() removes the channel from conn->chan_l, which\nmust be done under conn->lock. cleanup_listen() runs under the\nparent sk_lock, so acquiring conn->lock would invert the\nestablished conn->lock -> chan->lock -> sk_lock order.\n\nInstead of calling l2cap_chan_close() directly, schedule\nl2cap_chan_timeout with delay 0 to close the channel\nasynchronously. The timeout handler already acquires conn->lock\nand chan->lock in the correct order.\n\nThe timer is only armed when chan->conn is still set: if it is\nalready NULL, l2cap_conn_del() has already processed this channel\n(l2cap_chan_del + l2cap_sock_teardown_cb + l2cap_sock_close_cb),\nso there is nothing left to do. If l2cap_conn_del() races in\nafter the timer is armed, __clear_chan_timer() inside\nl2cap_chan_del() cancels it; if the timer has already fired, the\nhandler returns harmlessly because chan->conn was cleared."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.259", "versionStartIncluding": "3.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.210", "versionStartIncluding": "3.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.176", "versionStartIncluding": "3.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "3.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.93", "versionStartIncluding": "3.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.35", "versionStartIncluding": "3.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.12", "versionStartIncluding": "3.4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "3.4"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:35:07.724Z"}}}, "cveMetadata": {"cveId": "CVE-2026-53358", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:07:44.244Z", "dateReserved": "2026-06-09T07:44:35.400Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-02T13:43:17.630Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The timeout handler already acquires conn->lock\nand chan->lock in the correct order.\n\nThe timer is only armed when chan->conn is still set: if it is\nalready NULL, l2cap_conn_del() has already processed this channel\n(l2cap_chan_del + l2cap_sock_teardown_cb + l2cap_sock_close_cb),\nso there is nothing left to do. If l2cap_conn_del() races in\nafter the timer is armed, __clear_chan_timer() inside\nl2cap_chan_del() cancels it; if the timer has already fired, the\nhandler returns harmlessly because chan->conn was cleared."}], "id": "CVE-2026-53358", "lastModified": "2026-10-19T20:19:15.933", "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-2026-53358", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:28:55.590767Z", "version": "2.0.3"}}]}, "published": "2026-07-02T15:17:03.283", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3634cbdc2eb414b69ffa752ddbe5e0458518e321"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50dfec218808b148ab4247b1858031b7a32015c5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7555fd885a0603f50e49a655850a1f2bd8a25398"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/859d3ace791ed878ae9ba5522c7844d960da8f88"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89dec92041717b027216e110599e4f6d6c921b79"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8c8e620467a7b51562dbcefbd1f09f288d7d710d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e1c100e2d61bd8c718b7d91fe3e050780a9bf72d"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen()", "id": "2496575", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496575"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-413", "details": ["A flaw was found in the Linux kernel's Bluetooth L2CAP (Logical Link Control and Adaptation Protocol) implementation. This vulnerability arises from an incorrect order of acquiring locks during channel cleanup, which could lead to a race condition. This issue could potentially cause instability or unexpected behavior within the Bluetooth subsystem. The fix involves using a channel timer to close channels asynchronously, ensuring proper lock acquisition."], "name": "CVE-2026-53358", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53358\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53358\nhttps://lore.kernel.org/linux-cve-announce/2026070236-CVE-2026-53358-6f81@gregkh/T"], "threat_severity": "Moderate"}

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