CVE-2026-63915

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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": 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"vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2026-63915", "lastModified": "2026-10-30T17:44:59.950", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T16:17:09.517", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1905f5ec3641b2b234bb63549c8ca11ab85466eb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22d41b176b9989efd21c3b2d3abf6728f05b9d9a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/37382293f174b82a0616c8295e32b1fc8e13d1ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/83b1362edc9d6ae376c6f36da116e2c70f2e70a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b99366d74b535d0cadb1ef73e04639415d9ff3b7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ed6d5d97dad0334a7f43d218753429cbe2f70a4f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f040e590c035bfd9553fe79ee9585caf1b14d67b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: nfc: hci: fix out-of-bounds read in HCP header parsing", "id": "2502455", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502455"}, "csaw": false, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnfc: hci: fix out-of-bounds read in HCP header parsing\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.\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.", "A flaw was found in the Linux kernel's Near Field Communication (NFC) Host Controller Interface (HCI). A remote attacker, by sending a specially crafted 0-byte Host Controller Protocol (HCP) frame, could trigger an out-of-bounds read. This could lead to a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-63915", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63915\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63915\nhttps://lore.kernel.org/linux-cve-announce/2026071947-CVE-2026-63915-8654@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8b8d2e08bf0d50193931afd27482a59376b66b2b,ed6d5d97dad0334a7f43d218753429cbe2f70a4f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8b8d2e08bf0d50193931afd27482a59376b66b2b,b99366d74b535d0cadb1ef73e04639415d9ff3b7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8b8d2e08bf0d50193931afd27482a59376b66b2b,37382293f174b82a0616c8295e32b1fc8e13d1ed)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8b8d2e08bf0d50193931afd27482a59376b66b2b,c4cc6b3b0013acb3ed0b2b60e57dfae98647fe98)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8b8d2e08bf0d50193931afd27482a59376b66b2b,1905f5ec3641b2b234bb63549c8ca11ab85466eb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8b8d2e08bf0d50193931afd27482a59376b66b2b,22d41b176b9989efd21c3b2d3abf6728f05b9d9a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8b8d2e08bf0d50193931afd27482a59376b66b2b,83b1362edc9d6ae376c6f36da116e2c70f2e70a6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[8b8d2e08bf0d50193931afd27482a59376b66b2b,f040e590c035bfd9553fe79ee9585caf1b14d67b)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.259,6.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.210,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.176,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.143,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.93,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.35,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.12,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T04:45:02.591755+00:00", "updated": "2026-08-04T07:00:05.832137+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}