185 lines
10 KiB
JSON
185 lines
10 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-2026-99191",
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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": "2026-09-25T10:25:14.400Z",
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"datePublished": "2026-10-28T10:35:47.854Z",
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"dateUpdated": "2026-10-30T12:42:48.993Z"
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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": "2026-10-30T12:42:48.993Z"
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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\ncalipso: keep BIG TCP payload_len in calipso_skbuff_setattr()\n\ncalipso_skbuff_setattr() adjusts payload_len by the length of the\noption it inserts or resizes:\n\n\tpayload = ntohs(ip6_hdr->payload_len);\n\tip6_hdr->payload_len = htons(payload + len_delta);\n\nGRO can build BIG TCP packets larger than IPV6_MAXPLEN, and stores\npayload_len == 0 for them; ipv6_payload_len() then falls back to\nskb->len. For such a packet forwarded to a destination mapped to\nCALIPSO, the code above writes len_delta (or 65536 + len_delta when\nshrinking) into payload_len, and ipv6_payload_len() no longer falls\nback to skb->len. nf_tables, conntrack and sch_cake rely on it.\n\nThe same arithmetic also wraps when a packet grows past IPV6_MAXPLEN,\nand a BIG TCP packet that shrinks below IPV6_MAXPLEN should get its\nreal length back.\n\nSet payload_len from the skb length with ipv6_set_payload_len(), which\nstores 0 above IPV6_MAXPLEN and the real length otherwise, as\nipv6_gro_complete() does. The network header was just reset to\nskb->data, so skb->len - sizeof(*ip6_hdr) is the payload length.\n\nTested on one kernel (arm64, QEMU) with SELinux permissive, a minimal\nmdp-generated policy (network_peer_controls=1), \"netlabelctl calipso\nadd pass doi:16\" and a NetLabel mapping of fd00:2::/64 to CALIPSO\nDOI 16. calipso_skbuff_setattr() was called through\nnetlbl_skbuff_setattr() from a test-only debugfs hook (not part of\nthis patch) adding a level-only label; payload_len after the call:\n\n case before fix after fix real length\n 1000, unlabeled 1016 1016 1016\n 70000 GSO, payload_len 0 16 0 70016\n 65530 GSO, grows past MAXPLEN 10 0 65546\n 65540 GSO with a 24 byte hop\n header, shrinks below MAXPLEN 65528 65532 65532\n 1000 with a 24 byte hop header 992 992 992\n\n(0 means ipv6_payload_len() returns the real length.) On the forward\npath, with a client injecting unlabeled UDP through a router to a\nserver, the router adds the CALIPSO option and the server delivers all\ndatagrams (Udp6InDatagrams 5, Ip6InTruncatedPkts 0) with this patch."
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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/ipv6/calipso.c"
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],
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"versions": [
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{
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"version": "81fbc812132cbc72a0f933b19bfd3a829bd946e4",
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"lessThan": "e29d0a00c619ac794b05d64f4438204478137365",
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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": "81fbc812132cbc72a0f933b19bfd3a829bd946e4",
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"lessThan": "929dc8e2c9165bb651dca26b2c68067a3880406b",
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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": "81fbc812132cbc72a0f933b19bfd3a829bd946e4",
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"lessThan": "1c9fcfca51e3c5cd46dd72a4da74d56eff183513",
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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": "81fbc812132cbc72a0f933b19bfd3a829bd946e4",
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"lessThan": "8ee0e03663826a76507048d58466b29321a57656",
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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": "81fbc812132cbc72a0f933b19bfd3a829bd946e4",
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"lessThan": "8070ed578b6b9134e045627fb745c887a806d46e",
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"status": "affected",
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"versionType": "git"
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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/ipv6/calipso.c"
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],
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"versions": [
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{
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"version": "5.19",
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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": "5.19",
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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": "6.6.161",
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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": "6.12.115",
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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": "6.18.59",
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"lessThanOrEqual": "6.18.*",
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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": "7.2.13",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.19",
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"versionEndExcluding": "6.6.161"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.19",
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"versionEndExcluding": "6.12.115"
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},
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.19",
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"versionEndExcluding": "6.18.59"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.19",
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"versionEndExcluding": "7.2.13"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.19",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/e29d0a00c619ac794b05d64f4438204478137365"
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},
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{
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"url": "https://git.kernel.org/stable/c/929dc8e2c9165bb651dca26b2c68067a3880406b"
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},
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{
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"url": "https://git.kernel.org/stable/c/1c9fcfca51e3c5cd46dd72a4da74d56eff183513"
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},
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{
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"url": "https://git.kernel.org/stable/c/8ee0e03663826a76507048d58466b29321a57656"
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},
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{
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"url": "https://git.kernel.org/stable/c/8070ed578b6b9134e045627fb745c887a806d46e"
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}
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],
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"title": "calipso: keep BIG TCP payload_len in calipso_skbuff_setattr()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |