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vuln-cve/data/2023/52xxx/CVE-2023-52502.json
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{
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"cveId": "CVE-2023-52502",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-02-20T12:30:33.313Z",
"datePublished": "2024-03-02T21:52:17.218Z",
"dateUpdated": "2026-08-05T09:10:16.026Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nfc: fix races in nfc_llcp_sock_get() and nfc_llcp_sock_get_sn()\n\nSili Luo reported a race in nfc_llcp_sock_get(), leading to UAF.\n\nGetting a reference on the socket found in a lookup while\nholding a lock should happen before releasing the lock.\n\nnfc_llcp_sock_get_sn() has a similar problem.\n\nFinally nfc_llcp_recv_snl() needs to make sure the socket\nfound by nfc_llcp_sock_from_sn() does not disappear."
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"value": "AV:A - The vulnerable lookups run in the NFC LLCP receive path (nfc_llcp_data_received → nfc_llcp_rx_skb → CONNECT/SNL/UI/I/DISC handlers) on frames from an NFC peer over a DEP link, requiring same-segment NFC proximity like Bluetooth adjacent attacks.\nAC:L - The attacker drives the lookup side by sending concurrent LLCP PDUs and can drive socket teardown via connect/disconnect and session churn; nfc_llcp_recv_snl also used the socket with no reference across a wide window, so the race is attacker-influenced and retryable.\nPR:N - Crafted LLCP frames are processed in-kernel from an unauthenticated NFC peer with no account or capabilities on the victim; AF_NFC STREAM/DGRAM sockets need no CAP_NET_RAW and phones commonly already have NFC/LLCP active.\nUI:N - Exploitation does not require a deliberate victim action beyond NFC already being enabled; a peer can bring up target/DEP mode and exchange LLCP PDUs without an interactive confirm step.\nS:U - This is a kernel heap UAF in the host NFC stack that escalates within the same OS security authority, with no VM/IOMMU or other cross-boundary escape.\nC:H - The race yields a use-after-free on struct sock/nfc_llcp_sock, which can be reclaimed and read to disclose arbitrary kernel memory.\nI:H - UAF on the socket object enables heap spray and corrupted sock state/function pointers, providing arbitrary write and control-flow hijack primitives in kernel context.\nA:H - The same UAF reliably causes kernel oops/panic or memory corruption crashes when the freed socket is accessed or when sock_hold runs on freed memory."
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