222 lines
13 KiB
JSON
222 lines
13 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-2025-40043",
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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": "2025-04-16T07:20:57.154Z",
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"datePublished": "2025-10-28T11:48:22.230Z",
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"dateUpdated": "2026-08-05T12:07:16.234Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:07:16.234Z"
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},
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"descriptions": [
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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\nnet: nfc: nci: Add parameter validation for packet data\n\nSyzbot reported an uninitialized value bug in nci_init_req, which was\nintroduced by commit 5aca7966d2a7 (\"Merge tag\n'perf-tools-fixes-for-v6.17-2025-09-16' of\ngit://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools\").\n\nThis bug arises due to very limited and poor input validation\nthat was done at nic_valid_size(). This validation only\nvalidates the skb->len (directly reflects size provided at the\nuserspace interface) with the length provided in the buffer\nitself (interpreted as NCI_HEADER). This leads to the processing\nof memory content at the address assuming the correct layout\nper what opcode requires there. This leads to the accesses to\nbuffer of `skb_buff->data` which is not assigned anything yet.\n\nFollowing the same silent drop of packets of invalid sizes at\n`nic_valid_size()`, add validation of the data in the respective\nhandlers and return error values in case of failure. Release\nthe skb if error values are returned from handlers in\n`nci_nft_packet` and effectively do a silent drop\n\nPossible TODO: because we silently drop the packets, the\ncall to `nci_request` will be waiting for completion of request\nand will face timeouts. These timeouts can get excessively logged\nin the dmesg. A proper handling of them may require to export\n`nci_request_cancel` (or propagate error handling from the\nnft packets handlers)."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:A - The parsed data is NCI notification payload whose RF-specific and activation parameters (ATS/RATS length byte, ATR_RES length, tech-specific params) originate from the contactless peer, so an attacker with a spoofed card or NFC emulator in proximity of a phone/POS/embedded reader supplies the malformed lengths. NFC proximity is Adjacent per kernel scoring guidance (a local unprivileged N_NCI-ldisc path also exists, but is strictly lower severity).\nAC:L - The attacker directly controls the length byte versus actual payload length and can present the malformed card/frame repeatedly until the target polls it; no race, no unpredictable memory-layout precondition is required.\nPR:N - No credentials or account on the target are needed — NFC polling activates and parses the notification automatically, and on the local variant `NCIUARTSETDRIVER` in nci_uart_tty_ioctl() has no capability check at all.\nUI:N - The NFC stack polls and processes discovery/activation notifications autonomously; the attacker brings the hostile device into range and the victim performs no action.\nS:U - The over-read, the write-back in the credits handler, and the leaked data all stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Tens of bytes past the payload — uninitialized slab tailroom and skb_shared_info, which holds kernel pointers — are copied into nfcid1/sens_res/ATS and exported to userspace via NFC netlink attributes, yielding stale-heap and kernel-pointer disclosure usable for KASLR defeat.\nI:H - `nci_core_conn_credits_ntf_packet()` writes masked bytes back into memory beyond the validated payload for up to 10 entries and adds an out-of-bounds byte into conn_info->credits_cnt, and unvalidated data populates ndev state (nci_ver, manufact_id, remote_gb, credits), giving attacker-shapeable kernel memory/state corruption.\nA:H - Out-of-bounds slab reads can hit a redzone/adjacent object and oops (KASAN/panic_on_oops), and the commit itself notes the resulting dropped packets leave nci_request() blocking until timeout with repeated dmesg flooding, degrading the NFC stack."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/nfc/nci/ntf.c"
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],
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"versions": [
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{
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"version": "6a2968aaf50c7a22fced77a5e24aa636281efca8",
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"lessThan": "8fcc7315a10a84264e55bb65ede10f0af20a983f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6a2968aaf50c7a22fced77a5e24aa636281efca8",
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"lessThan": "bfdda0123dde406dbff62e7e9136037e97998a15",
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"status": "affected",
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"versionType": "git"
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"lessThan": "0ba68bea1e356f466ad29449938bea12f5f3711f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6a2968aaf50c7a22fced77a5e24aa636281efca8",
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"lessThan": "74837bca0748763a77f77db47a0bdbe63b347628",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6a2968aaf50c7a22fced77a5e24aa636281efca8",
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"lessThan": "c395d1e548cc68e84584ffa2e3ca9796a78bf7b9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6a2968aaf50c7a22fced77a5e24aa636281efca8",
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"lessThan": "9c328f54741bd5465ca1dc717c84c04242fac2e1",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/nfc/nci/ntf.c"
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],
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"versions": [
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{
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"version": "3.2",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.2",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.195",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.156",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.112",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.53",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17.3",
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"lessThanOrEqual": "6.17.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.2",
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"versionEndExcluding": "5.15.195"
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"references": [
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"url": "https://git.kernel.org/stable/c/8fcc7315a10a84264e55bb65ede10f0af20a983f"
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"url": "https://git.kernel.org/stable/c/bfdda0123dde406dbff62e7e9136037e97998a15"
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"url": "https://git.kernel.org/stable/c/0ba68bea1e356f466ad29449938bea12f5f3711f"
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{
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"url": "https://git.kernel.org/stable/c/74837bca0748763a77f77db47a0bdbe63b347628"
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{
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"url": "https://git.kernel.org/stable/c/c395d1e548cc68e84584ffa2e3ca9796a78bf7b9"
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},
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{
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"url": "https://git.kernel.org/stable/c/9c328f54741bd5465ca1dc717c84c04242fac2e1"
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}
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],
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"title": "net: nfc: nci: Add parameter validation for packet data",
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