264 lines
15 KiB
JSON
264 lines
15 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-2026-98479",
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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": "2026-09-25T10:25:14.351Z",
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"datePublished": "2026-10-18T15:15:53.663Z",
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"dateUpdated": "2026-10-24T14:09:01.805Z"
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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": "2026-10-24T14:09:01.805Z"
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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\nscsi: libiscsi_tcp: Check the data direction of a Data-In PDU\n\nThe Data-In branch of iscsi_tcp_hdr_dissect() resolves the ITT to a task\nand copies the PDU's data segment into that command's scatterlist without\nasking whether the command was reading. iscsi_tcp_r2t_rsp() in the same\nfile does ask, and rejects an R2T for a command that is not DMA_TO_DEVICE.\n\nA target that answers a WRITE command's ITT with a Data-In therefore has\nthe initiator write target-supplied bytes into the pages that write was\nabout to send. Those are the caller's own pinned pages for an O_DIRECT\nwrite, and page cache pages for a buffered one.\n\nObserved against a test target that emits one 512-byte Data-In naming a 128\nKB write's ITT, after the R2T for that write. With O_DIRECT the caller's\nbuffer ends up holding 512 bytes of the target's data while pwrite()\nreturns 131072. Buffered is quieter: pwrite() and fsync() both succeed,\nnothing is logged, and reading those blocks back returns the target's bytes\nout of the page cache without a command going on the wire.\n\nCheck the direction before using the scatterlist, the way the R2T path\nalready does."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
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"baseScore": 7.5,
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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:N - A remote iSCSI target supplies the malicious SCSI Data-In PDU over routable TCP; iscsi_sw_tcp_data_ready() reaches iscsi_tcp_recv_skb(), iscsi_tcp_hdr_dissect(), and the patched iscsi_tcp_data_in().\nAC:L - iscsi_prep_scsi_cmd_pdu() exposes the live WRITE ITT to the target, which can deterministically return a Data-In with that ITT, the expected DataSN, and an in-range offset and length; no race or outside condition is required.\nPR:N - The receive path imposes no privilege or per-PDU authentication check on the connected target; iscsi_verify_itt() only validates the ITT's session age and index, and the target learns that ITT from the WRITE command.\nUI:N - After iscsi_queuecommand() submits an ordinary WRITE on a logged-in session, the target's Data-In is processed automatically by the TCP callback; exploitation requires no user approval or opening of attacker-supplied content.\nS:U - iscsi_tcp_hdr_dissect() redirects data into task->sc->sdb, affecting the initiator's caller pages or page cache under the same host-kernel security authority, without crossing a VM, IOMMU, or sandbox boundary.\nC:N - iscsi_tcp_segment_recv() only copies target-supplied bytes into the command scatterlist; this defect provides no path for reading initiator memory or returning unintended bytes to the target.\nI:H - iscsi_segment_seek_sg() makes the receive segment reference a WRITE command's sdb, after which iscsi_tcp_segment_recv() copies attacker-chosen bytes into an O_DIRECT caller buffer or buffered-write page-cache pages.\nA:N - iscsi_tcp_data_in() bounds the offset and DataSegmentLength to sdb.length, and iscsi_segment_seek_sg() rejects offsets outside the scatterlist; the demonstrated effect is silent bounded data corruption, not an oops, hang, or resource exhaustion."
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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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"drivers/scsi/libiscsi_tcp.c"
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],
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"versions": [
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{
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"version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
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"lessThan": "79991b770fc3685b1d5cf805b659a879edd19931",
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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": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
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"lessThan": "8db1232945bc663fb94f300090a1fc108de99296",
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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": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
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"lessThan": "94e5bdd08e51c450d954bc592f591c233ca5c9df",
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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": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
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"lessThan": "de96dc11aee0d058927bff94a168e3c5c46483e2",
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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": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
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"lessThan": "e3b25bf2cf2496e85bc05b33360faf9fdf880e03",
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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": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
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"lessThan": "ee56b5e18f566c0b5a183379dcd63d402cebf2f8",
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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": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
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"lessThan": "24ffc919467d20951f0f132d1c75294e2e91e09b",
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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": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
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"lessThan": "bce07e2f37b5e4a427d36fd6b1c14067b27591db",
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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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"drivers/scsi/libiscsi_tcp.c"
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],
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"versions": [
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{
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"version": "2.6.29",
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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": "2.6.29",
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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": "5.10.271",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.222",
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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": "6.1.189",
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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": "6.6.158",
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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": "6.12.112",
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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": "6.18.55",
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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": "7.2.9",
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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": "2.6.29",
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"versionEndExcluding": "5.10.271"
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.29",
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"versionEndExcluding": "6.6.158"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.29",
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"versionEndExcluding": "6.12.112"
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"versionStartIncluding": "2.6.29",
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"versionEndExcluding": "7.2.9"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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/79991b770fc3685b1d5cf805b659a879edd19931"
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},
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{
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"url": "https://git.kernel.org/stable/c/8db1232945bc663fb94f300090a1fc108de99296"
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},
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{
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"url": "https://git.kernel.org/stable/c/94e5bdd08e51c450d954bc592f591c233ca5c9df"
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},
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{
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"url": "https://git.kernel.org/stable/c/de96dc11aee0d058927bff94a168e3c5c46483e2"
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},
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{
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"url": "https://git.kernel.org/stable/c/e3b25bf2cf2496e85bc05b33360faf9fdf880e03"
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},
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{
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"url": "https://git.kernel.org/stable/c/ee56b5e18f566c0b5a183379dcd63d402cebf2f8"
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},
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{
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"url": "https://git.kernel.org/stable/c/24ffc919467d20951f0f132d1c75294e2e91e09b"
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},
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{
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"url": "https://git.kernel.org/stable/c/bce07e2f37b5e4a427d36fd6b1c14067b27591db"
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}
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],
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"title": "scsi: libiscsi_tcp: Check the data direction of a Data-In PDU",
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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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} |