{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54120", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T13:02:52.520Z", "datePublished": "2025-12-24T13:06:40.420Z", "dateUpdated": "2026-08-05T09:17:22.701Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:17:22.701Z" }, "descriptions": [ { "lang": "en", "value": "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" } ], "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 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hidp/core.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "152f47bd6b995e0e98c85672f6d19894bc287ef2", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "5f3d214d19899183d4e0cce7552998262112e4ab", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "8a99e6200c38b78a45dcd12a6bdc43fdf4dc36be", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "f7ec5ca433ceead8d9d78fd2febff094f289441d", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "0efb276d5848a3accc37c6f41b85e442c4768169", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "f6719fd8f409fa1da8dc956e93822d25e1e8b360", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "248af9feca062a4ca9c3f2ccf67056c8a5eb817f", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "c95930abd687fcd1aa040dc4fe90dff947916460", "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/hidp/core.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.313", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.281", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.241", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.178", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.108", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.25", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.12", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3", "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": "2.6.12", "versionEndExcluding": "4.14.313" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "4.19.281" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.4.241" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.108" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.25" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.2.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.3" } ] } ] } ], "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" } } } }