{"api_version":"1","generated_at":"2026-10-15T23:43:48+00:00","cve":"CVE-2023-54120","urls":{"html":"https://cve.report/CVE-2023-54120","api":"https://cve.report/api/cve/CVE-2023-54120.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-54120","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-54120"},"summary":{"title":"Bluetooth: Fix race condition in hidp_session_thread","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Fix race condition in hidp_session_thread\n\nThere is a potential race condition in hidp_session_thread that may\nlead to use-after-free. For instance, the timer is active while\nhidp_del_timer is called in hidp_session_thread(). After hidp_session_put,\nthen 'session' will be freed, causing kernel panic when hidp_idle_timeout\nis running.\n\nThe solution is to use del_timer_sync instead of del_timer.\n\nHere is the call trace:\n\n? hidp_session_probe+0x780/0x780\ncall_timer_fn+0x2d/0x1e0\n__run_timers.part.0+0x569/0x940\nhidp_session_probe+0x780/0x780\ncall_timer_fn+0x1e0/0x1e0\nktime_get+0x5c/0xf0\nlapic_next_deadline+0x2c/0x40\nclockevents_program_event+0x205/0x320\nrun_timer_softirq+0xa9/0x1b0\n__do_softirq+0x1b9/0x641\n__irq_exit_rcu+0xdc/0x190\nirq_exit_rcu+0xe/0x20\nsysvec_apic_timer_interrupt+0xa1/0xc0","state":"PUBLISHED","assigner":"Linux","published_at":"2025-12-24 13:16:13","updated_at":"2026-10-15 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54120","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 152f47bd6b995e0e98c85672f6d19894bc287ef2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 5f3d214d19899183d4e0cce7552998262112e4ab git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 8a99e6200c38b78a45dcd12a6bdc43fdf4dc36be git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 f7ec5ca433ceead8d9d78fd2febff094f289441d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.19.281 4.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.4.241 5.4.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.178 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.108 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.25 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.2.12 6.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2023","cve_id":"54120","cve":"CVE-2023-54120","epss":"0.002870000","percentile":"0.208680000","score_date":"2026-08-06","updated_at":"2026-08-07 00:14:20"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2023-54120","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-10-15T21:38:39.186445Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-10-15T21:41:40.191Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP 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the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Fix race condition in hidp_session_thread\n\nThere is a potential race condition in hidp_session_thread that may\nlead to use-after-free. For instance, the timer is active while\nhidp_del_timer is called in hidp_session_thread(). After hidp_session_put,\nthen 'session' will be freed, causing kernel panic when hidp_idle_timeout\nis running.\n\nThe solution is to use del_timer_sync instead of del_timer.\n\nHere is the call trace:\n\n? hidp_session_probe+0x780/0x780\ncall_timer_fn+0x2d/0x1e0\n__run_timers.part.0+0x569/0x940\nhidp_session_probe+0x780/0x780\ncall_timer_fn+0x1e0/0x1e0\nktime_get+0x5c/0xf0\nlapic_next_deadline+0x2c/0x40\nclockevents_program_event+0x205/0x320\nrun_timer_softirq+0xa9/0x1b0\n__do_softirq+0x1b9/0x641\n__irq_exit_rcu+0xdc/0x190\nirq_exit_rcu+0xe/0x20\nsysvec_apic_timer_interrupt+0xa1/0xc0"}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:A - The vulnerable HIDP session and its idle timer are driven entirely by a Bluetooth peer's traffic and link teardown, so the attacker must be within Bluetooth radio range of the host. Bluetooth-reachable code is scored Adjacent.\nAC:L - The attacker controls both sides of the race: the idle timer is re-armed on every input report it sends (so expiry timing is known precisely), and it triggers the session-thread exit at that exact moment via an L2CAP disconnect or a VIRTUAL_CABLE_UNPLUG control message. The attempt can be repeated indefinitely by reconnecting.\nPR:N - The attacker needs no account or privileges on the target host; it acts purely as a Bluetooth HID peripheral, and Linux HID hosts of this era accepted HID connections from unbonded peers. All required actions are ordinary HIDP protocol traffic.\nUI:N - The HIDP session is established and torn down by the Bluetooth daemon automatically in response to the peer's connection and its subsequent disconnect/unplug; no victim action is required at any point.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - hidp_idle_timeout() reads pointer fields (intr_sock/ctrl_sock) out of the freed hidp_session and follows them, and the resulting UAF primitive over a plain-kfree'd heap object can be leveraged with heap grooming to disclose arbitrary kernel memory.\nI:H - The callback writes EUNATCH through a pointer read from freed memory and performs wake_up_interruptible() on a waitqueue head taken from that freed object, giving both a controlled write and an indirect call through an attacker-groomable function pointer — sufficient for control-flow hijack.\nA:H - The reported symptom is a kernel panic from the timer callback running against a freed session; any such use-after-free reliably oopses the kernel and can be triggered repeatedly by a nearby device."}]}],"providerMetadata":{"dateUpdated":"2026-08-05T09:17:22.701Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/152f47bd6b995e0e98c85672f6d19894bc287ef2"},{"url":"https://git.kernel.org/stable/c/5f3d214d19899183d4e0cce7552998262112e4ab"},{"url":"https://git.kernel.org/stable/c/8a99e6200c38b78a45dcd12a6bdc43fdf4dc36be"},{"url":"https://git.kernel.org/stable/c/f7ec5ca433ceead8d9d78fd2febff094f289441d"},{"url":"https://git.kernel.org/stable/c/0efb276d5848a3accc37c6f41b85e442c4768169"},{"url":"https://git.kernel.org/stable/c/f6719fd8f409fa1da8dc956e93822d25e1e8b360"},{"url":"https://git.kernel.org/stable/c/248af9feca062a4ca9c3f2ccf67056c8a5eb817f"},{"url":"https://git.kernel.org/stable/c/c95930abd687fcd1aa040dc4fe90dff947916460"}],"title":"Bluetooth: Fix race condition in hidp_session_thread","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2023-54120","datePublished":"2025-12-24T13:06:40.420Z","dateReserved":"2025-12-24T13:02:52.520Z","dateUpdated":"2026-10-15T21:41:40.191Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-12-24 13:16:13","lastModifiedDate":"2026-10-15 22:17:53","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-15T21:38:39.186445Z","id":"CVE-2023-54120","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2023","CveId":"54120","Ordinal":"1","Title":"Bluetooth: Fix race condition in hidp_session_thread","CVE":"CVE-2023-54120","Year":"2023"},"notes":[{"CveYear":"2023","CveId":"54120","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: Fix race condition in hidp_session_thread\n\nThere is a potential race condition in hidp_session_thread that may\nlead to use-after-free. For instance, the timer is active while\nhidp_del_timer is called in hidp_session_thread(). After hidp_session_put,\nthen 'session' will be freed, causing kernel panic when hidp_idle_timeout\nis running.\n\nThe solution is to use del_timer_sync instead of del_timer.\n\nHere is the call trace:\n\n? hidp_session_probe+0x780/0x780\ncall_timer_fn+0x2d/0x1e0\n__run_timers.part.0+0x569/0x940\nhidp_session_probe+0x780/0x780\ncall_timer_fn+0x1e0/0x1e0\nktime_get+0x5c/0xf0\nlapic_next_deadline+0x2c/0x40\nclockevents_program_event+0x205/0x320\nrun_timer_softirq+0xa9/0x1b0\n__do_softirq+0x1b9/0x641\n__irq_exit_rcu+0xdc/0x190\nirq_exit_rcu+0xe/0x20\nsysvec_apic_timer_interrupt+0xa1/0xc0","Type":"Description","Title":"Bluetooth: Fix race condition in hidp_session_thread"}]}}}