317 lines
16 KiB
JSON
317 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-53254",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-06-09T07:44:35.394Z",
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"datePublished": "2026-06-25T08:39:45.273Z",
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"dateUpdated": "2026-10-19T19:57:31.915Z"
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},
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},
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: validate skb length in MCC handlers\n\nThe RFCOMM MCC handlers cast skb->data to protocol-specific structs\nwithout validating skb->len first. A malicious remote device can send\ntruncated MCC frames and trigger out-of-bounds reads in these handlers.\n\nFix this by using skb_pull_data() to validate and access the required\ndata before dereferencing it.\n\nrfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows\n1-byte RPN requests. Handle this by validating only the DLCI byte first,\nand validating the full struct only when len > 1."
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{
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"baseScore": 8.1,
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"baseSeverity": "HIGH"
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},
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{
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"lang": "en",
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"value": "AV:A - An attacker reaches the vulnerable RFCOMM MCC parsing code by sending malformed Bluetooth RFCOMM frames over a BR/EDR L2CAP connection. Bluetooth requires radio adjacency rather than ordinary IP network reachability.\nAC:L - The attacker controls the RFCOMM frame contents and can send truncated MCC frames directly after establishing the Bluetooth/L2CAP connection. No race or condition outside the attacker’s control is required.\nPR:N - The RFCOMM L2CAP listener uses the SDP/low-security path, and the vulnerable control-channel parsing occurs before RFCOMM DLC/service-level authentication. A malicious nearby Bluetooth device does not need local privileges or authenticated credentials.\nUI:N - No victim action is needed once the target Bluetooth stack is reachable and accepting RFCOMM/L2CAP traffic. The attacker sends the malformed frames directly.\nS:U - The impact is within the Linux kernel Bluetooth/RFCOMM security authority. There is no VM escape, IOMMU bypass, or separate security scope crossed.\nC:H - The bug is an out-of-bounds read from kernel skb memory, and some handler paths can reflect values derived from parsed control fields back to the peer. Under the required higher-severity rule, this is scored as high confidentiality impact.\nI:N - The fix and code review show bounded out-of-bounds reads, not an out-of-bounds write, use-after-free, or control-flow corruption primitive. Any state changes are limited to RFCOMM negotiation for the attacker-controlled connection.\nA:H - Malformed short Bluetooth frames can trigger kernel out-of-bounds reads in the RFCOMM receive thread, with related Bluetooth short-frame bugs producing KASAN slab-out-of-bounds reports. Under kernel scoring guidance, such remotely triggerable kernel fault conditions are high availability impact."
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}
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}
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"net/bluetooth/rfcomm/core.c"
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} |