{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-63915", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.020Z", "datePublished": "2026-07-19T14:55:19.305Z", "dateUpdated": "2026-08-05T12:37:09.414Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:37:09.414Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: hci: fix out-of-bounds read in HCP header parsing\n\nBoth nfc_hci_recv_from_llc() and nci_hci_data_received_cb() read\npacket->header from skb->data at function entry without first checking\nthat the buffer holds at least one byte. A malicious NFC peer can send\na 0-byte HCP frame that passes through the SHDLC layer and reaches\nthese functions, causing an out-of-bounds heap read of packet->header.\nThe same 0-byte frame, if queued as a non-final fragment, also causes\nthe reassembly loop to underflow msg_len to UINT_MAX, triggering\nskb_over_panic() when the reassembled skb is written.\n\nFix this by adding a pskb_may_pull() check at the entry of each\nfunction before packet->header is first accessed. The existing\npskb_may_pull() checks before the reassembled hcp_skb is cast to\nstruct hcp_packet remain in place to guard the 2-byte HCP message\nheader." } ], "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 triggered by malformed HCP frames from a malicious NFC peer over the RF link; NFC is a proximity wireless medium analogous to Bluetooth, requiring the attacker to be within NFC range (~4 cm) of the victim device.\nAC:L - An attacker with commodity NFC hardware can reliably send a 0-byte HCP frame (or fragment sequence) to trigger the out-of-bounds read and the msg_len integer underflow that leads to skb_over_panic(), with no race or special memory layout required.\nPR:N - Exploitation requires no privileges on the victim system; inbound frames are processed in kernel driver/workqueue context with no authentication, and the attacker only needs an active NFC RF session with the victim's controller.\nUI:N - On typical NFC-enabled deployments (Android phones, payment terminals, transit readers), the victim does not need to perform a deliberate administrative action beyond having NFC radio active while an attacker initiates proximity communication.\nS:U - Impact is confined to kernel memory and availability on the victim host; it does not cross a VM, container, or IOMMU security boundary.\nC:H - The vulnerable code dereferences packet->header from skb->data on a zero-length skb, causing an out-of-bounds heap read of at least one byte of adjacent kernel memory.\nI:H - The fragment-reassembly path underflows msg_len when processing zero-length fragments, passing a wrapped length to skb_put_data() and attempting a massive kernel buffer write before panic; combined with the heap out-of-bounds read, this is kernel memory corruption with potential for further exploitation.\nA:H - The integer underflow in HCP fragment reassembly reliably triggers skb_over_panic() (kernel BUG/panic), causing complete loss of kernel availability on affected systems." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/nfc/hci/core.c", "net/nfc/nci/hci.c" ], "versions": [ { "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b", "lessThan": "ed6d5d97dad0334a7f43d218753429cbe2f70a4f", "status": "affected", "versionType": "git" }, { "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b", "lessThan": "b99366d74b535d0cadb1ef73e04639415d9ff3b7", "status": "affected", "versionType": "git" }, { "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b", "lessThan": "37382293f174b82a0616c8295e32b1fc8e13d1ed", "status": "affected", "versionType": "git" }, { "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b", "lessThan": "c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98", "status": "affected", "versionType": "git" }, { "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b", "lessThan": "1905f5ec3641b2b234bb63549c8ca11ab85466eb", "status": "affected", "versionType": "git" }, { "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b", "lessThan": "22d41b176b9989efd21c3b2d3abf6728f05b9d9a", "status": "affected", "versionType": "git" }, { "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b", "lessThan": "83b1362edc9d6ae376c6f36da116e2c70f2e70a6", "status": "affected", "versionType": "git" }, { "version": "8b8d2e08bf0d50193931afd27482a59376b66b2b", "lessThan": "f040e590c035bfd9553fe79ee9585caf1b14d67b", "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/nfc/hci/core.c", "net/nfc/nci/hci.c" ], "versions": [ { "version": "3.5", "status": "affected" }, { "version": "0", "lessThan": "3.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.259", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "3.5", "versionEndExcluding": "5.10.259" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.15.210" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.12.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "6.18.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.0.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ed6d5d97dad0334a7f43d218753429cbe2f70a4f" }, { "url": "https://git.kernel.org/stable/c/b99366d74b535d0cadb1ef73e04639415d9ff3b7" }, { "url": "https://git.kernel.org/stable/c/37382293f174b82a0616c8295e32b1fc8e13d1ed" }, { "url": "https://git.kernel.org/stable/c/c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98" }, { "url": "https://git.kernel.org/stable/c/1905f5ec3641b2b234bb63549c8ca11ab85466eb" }, { "url": "https://git.kernel.org/stable/c/22d41b176b9989efd21c3b2d3abf6728f05b9d9a" }, { "url": "https://git.kernel.org/stable/c/83b1362edc9d6ae376c6f36da116e2c70f2e70a6" }, { "url": "https://git.kernel.org/stable/c/f040e590c035bfd9553fe79ee9585caf1b14d67b" } ], "title": "nfc: hci: fix out-of-bounds read in HCP header parsing", "x_generator": { "engine": "bippy-1.2.0" } } } }