{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53358", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.400Z", "datePublished": "2026-07-02T13:43:17.630Z", "dateUpdated": "2026-08-05T12:35:07.724Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:35:07.724Z" }, "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." } ], "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" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.12", "lessThanOrEqual": "7.0.*", "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": "3.4", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.12.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "6.18.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "7.0.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.4", "versionEndExcluding": "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" } } } }