{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53297", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-16T08:09:37.993Z", "datePublished": "2025-09-16T08:11:29.283Z", "dateUpdated": "2026-08-05T09:13:24.678Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:13:24.678Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix \"bad unlock balance\" in l2cap_disconnect_rsp\n\nconn->chan_lock isn't acquired before l2cap_get_chan_by_scid,\nif l2cap_get_chan_by_scid returns NULL, then 'bad unlock balance'\nis triggered." } ], "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 reached only by processing an L2CAP Disconnect Response on the BR/EDR or LE signaling CID (hci_rx_work → l2cap_recv_acldata → l2cap_recv_frame → l2cap_disconnect_rsp), which requires a Bluetooth peer within radio range; kernel guidance maps Bluetooth to Adjacent.\nAC:L - The attacker reliably triggers the bad unlock by sending DISCONN_RSP with a nonexistent SCID, and can also drive concurrent chan_lock holders (channel timers, connect/disconnect churn) so the premature unlock races list walks; both sides are attacker-influenced with no uncontrollable condition.\nPR:N - l2cap_recv_frame dispatches CID 0x0001/0x0005 to the signaling handlers with no pairing, encryption, or security-level check, so an unauthenticated in-range device can send the triggering PDU on an established ACL/LE link.\nUI:N - No victim action is required; once the host is connectable/advertising with Bluetooth enabled (default on phones, cars, and laptops), the crafted PDU is processed automatically by hci_rx_work.\nS:U - Impact stays inside the host kernel Bluetooth/L2CAP authority; this is standard kernel memory-safety compromise, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - Unlocking conn->chan_lock while another context (e.g. l2cap_chan_timeout) holds it exposes conn->chan_l to unsynchronized list manipulation and use-after-free of struct l2cap_chan, which per guidance enables heap reuse and arbitrary kernel read primitives.\nI:H - The same premature unlock races l2cap_chan_del/list walks against concurrent channel ops, yielding use-after-free write and function-pointer hijack primitives via sprayed reclaimed channel objects.\nA:H - The defect produces a lockdep \"bad unlock balance\" WARNING (panic under panic_on_warn) and, when it unlocks under a concurrent holder, use-after-free crashes/oopses on the channel list that an adjacent peer can re-trigger at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/l2cap_core.c" ], "versions": [ { "version": "f2d38e77aa5f3effc143e7dd24da8acf02925958", "lessThan": "5f352a56f0e607e6ff539cbf12156bfd8af232be", "status": "affected", "versionType": "git" }, { "version": "1351551aa9058e07a20a27a158270cf84fcde621", "lessThan": "6a27762340ad08643de3bc17fe1646ea489ca2e2", "status": "affected", "versionType": "git" }, { "version": "c02421992505c95c7f3c9ad59ee35e22eac60988", "lessThan": "2112c4c47d36bc5aba3ddeb9afedce6ae6a67e7d", "status": "affected", "versionType": "git" }, { "version": "d9ba36c22a7bb09d6bac4cc2f243eff05da53f43", "lessThan": "55410a9144c76ecda126e6cdec556dfcd8f343b2", "status": "affected", "versionType": "git" }, { "version": "ac6725a634f7e8c0330610a8527f20c730b61115", "lessThan": "116b9c002c894097adc2b8684db2d1da4229ed46", "status": "affected", "versionType": "git" }, { "version": "348d446762e7c70778df8bafbdf3fa0df2123f58", "lessThan": "fd269a0435f8e9943b7a57c5a59688848d42d449", "status": "affected", "versionType": "git" }, { "version": "a2a9339e1c9deb7e1e079e12e27a0265aea8421a", "lessThan": "5134556c9be582793f30695c09d18a26fe1ff2d7", "status": "affected", "versionType": "git" }, { "version": "a2a9339e1c9deb7e1e079e12e27a0265aea8421a", "lessThan": "25e97f7b1866e6b8503be349eeea44bb52d661ce", "status": "affected", "versionType": "git" }, { "version": "d82a439c3cfdb28aa7e82e2e849c5c4dd9fca284", "status": "affected", "versionType": "git" }, { "version": "4.14.313", "lessThan": "4.14.316", "status": "affected", "versionType": "semver" }, { "version": "4.19.281", "lessThan": "4.19.284", "status": "affected", "versionType": "semver" }, { "version": "5.4.241", "lessThan": "5.4.244", "status": "affected", "versionType": "semver" }, { "version": "5.10.178", "lessThan": "5.10.181", "status": "affected", "versionType": "semver" }, { "version": "5.15.108", "lessThan": "5.15.113", "status": "affected", "versionType": "semver" }, { "version": "6.1.25", "lessThan": "6.1.30", "status": "affected", "versionType": "semver" }, { "version": "6.2.12", "lessThan": "6.3", "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/l2cap_core.c" ], "versions": [ { "version": "6.3", "status": "affected" }, { "version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.316", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.284", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.244", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.181", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.113", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.30", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3.4", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4", "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": "4.14.313", "versionEndExcluding": "4.14.316" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.281", "versionEndExcluding": "4.19.284" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.241", "versionEndExcluding": "5.4.244" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.178", "versionEndExcluding": "5.10.181" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.108", "versionEndExcluding": "5.15.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.25", "versionEndExcluding": "6.1.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.3.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5f352a56f0e607e6ff539cbf12156bfd8af232be" }, { "url": "https://git.kernel.org/stable/c/6a27762340ad08643de3bc17fe1646ea489ca2e2" }, { "url": "https://git.kernel.org/stable/c/2112c4c47d36bc5aba3ddeb9afedce6ae6a67e7d" }, { "url": "https://git.kernel.org/stable/c/55410a9144c76ecda126e6cdec556dfcd8f343b2" }, { "url": "https://git.kernel.org/stable/c/116b9c002c894097adc2b8684db2d1da4229ed46" }, { "url": "https://git.kernel.org/stable/c/fd269a0435f8e9943b7a57c5a59688848d42d449" }, { "url": "https://git.kernel.org/stable/c/5134556c9be582793f30695c09d18a26fe1ff2d7" }, { "url": "https://git.kernel.org/stable/c/25e97f7b1866e6b8503be349eeea44bb52d661ce" } ], "title": "Bluetooth: L2CAP: fix \"bad unlock balance\" in l2cap_disconnect_rsp", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2023-53297", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-01-14T18:12:33.884627Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "description": "CWE-noinfo Not enough information" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T18:12:56.873Z" } } ] } }