275 lines
15 KiB
JSON
275 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-2026-92508",
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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": "2026-09-16T12:21:13.872Z",
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"datePublished": "2026-09-17T16:10:19.443Z",
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"dateUpdated": "2026-10-19T09:04:14.344Z"
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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": "2026-10-19T09:04:14.344Z"
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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\nRDMA/core: Fix potential use after free in ib_free_cq()\n\nWhen accessing a CQ via the netlink path the only synchronization\nmechanism for the said CQ is rdma_restrack_get().\nCurrently, rdma_restrack_del() is invoked at the end of\nib_free_cq(), which is too late, since by that point\nvendor-specific resources associated with the CQ might already be\nfreed. This can leave a short window where the CQ remains accessible\nthrough restrack, leading to a potential use-after-free.\n\nFix this by moving the rdma_restrack_del() call to be before the freeing\nof the vendor-specific resources ensuring that the CQ is removed from\nrestrack before its internal resources are released.\nThis guarantees that no new users hold references to a CQ that is in\nthe process of destruction."
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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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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:L - The use side is a local NETLINK_RDMA RDMA_NLDEV_CMD_RES_CQ_GET handled by nldev_res_get_cq_doit/dumpit → res_get_common_doit/dumpit, which rdma_restrack_get()s a CQ still in the xarray while ib_free_cq() is destroying it. No remote protocol message carries the lookup; the accessor is a netlink syscall.\nAC:L - The attacker drives both sides of the race: one thread loops RDMA_NLDEV_CMD_RES_CQ_GET while another opens and drops kernel-ULP RDMA connections so ib_free_cq() runs (svc_rdma_free() or smbdirect_connection_destroy_qp()). That is not a victim-only timing window.\nPR:L - RDMA_NLDEV_CMD_RES_CQ_GET in nldev_cb_table has no RDMA_NL_ADMIN_PERM, and NETLINK_RDMA is created with NL_CFG_F_NONROOT_RECV, so an ordinary user can dump CQs. Kernel CQ teardown via /dev/infiniband/rdma_cm (ucma_misc mode 0666) also does not need init-namespace root.\nUI:N - The attacker sends the RDMA_NLDEV_CMD_RES_CQ_GET dumps and tears down their own kernel-ULP RDMA connections; no other user must mount a volume, open a device, or confirm an action.\nS:U - The UAF is of host-kernel CQ vendor state (ib_cq buffers freed in destroy_cq/pre_destroy_cq) and stays inside the same kernel authority; it is not a VM escape, IOMMU bypass, or guest-to-host boundary cross.\nC:H - c4iw_destroy_cq() → destroy_cq() dma_free_coherent()s chp->cq.queue before rdma_restrack_del(); a concurrent fill_res_cq_entry → c4iw_fill_res_cq_entry still indexes that queue, so the UAF reads freed CQ-ring memory.\nI:H - The same ib_free_cq() window lets fill_res_cq_entry use vendor CQ resources already released by destroy_cq/pre_destroy_cq (Chelsio queue pages; mlx5 destroy_cq_kernel CQ buffers). Reclaiming that heap object yields an arbitrary write and control-flow hijack.\nA:H - fill_res_cq_entry walking a CQ whose queue or HW context was already freed in ib_free_cq() (after pre_destroy_cq/destroy_cq, before rdma_restrack_del) oopses or panics the kernel even without a crafted exploit."
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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/infiniband/core/cq.c"
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],
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"versions": [
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{
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"version": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
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"lessThan": "a804b162f9bc2b38b2ed1b4752eea9faadb1645b",
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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": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
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"lessThan": "91f8a17a22ab615a03743120e19935e731f28fb9",
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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": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
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"lessThan": "76f2cb4f721815c3b6262a6dc2151de88646924c",
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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": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
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"lessThan": "b8dcca427096fc9c50f1b376847fea72bc842d31",
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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": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
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"lessThan": "9abea37942534eeb049335476178696b654b000c",
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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": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
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"lessThan": "43403fe45379c64fa6276e5a8ede44493e5d2d3d",
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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": "43d781b9fa562f0c6e50f62c870fbfeb9dc85213",
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"lessThan": "29dc2f8e1c97372c2871a70088707933515fbd5b",
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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": "7ac277a01f9017fcde4f3f81670c995992945433",
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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": "093f87dda065e0f618dd577985eccbe85efb9b54",
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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": "5.8.17",
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"lessThan": "5.9",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.9.2",
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"lessThan": "5.10",
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"status": "affected",
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"versionType": "semver"
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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/infiniband/core/cq.c"
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],
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"versions": [
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{
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"version": "5.10",
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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": "5.10",
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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": "5.15.221",
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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": "6.1.188",
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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": "6.6.157",
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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": "6.12.110",
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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": "6.18.52",
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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": "7.2.6",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10",
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"versionEndExcluding": "5.15.221"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a804b162f9bc2b38b2ed1b4752eea9faadb1645b"
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},
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{
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"url": "https://git.kernel.org/stable/c/91f8a17a22ab615a03743120e19935e731f28fb9"
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},
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{
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"url": "https://git.kernel.org/stable/c/76f2cb4f721815c3b6262a6dc2151de88646924c"
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},
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{
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"url": "https://git.kernel.org/stable/c/b8dcca427096fc9c50f1b376847fea72bc842d31"
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},
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{
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"url": "https://git.kernel.org/stable/c/9abea37942534eeb049335476178696b654b000c"
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},
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{
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"url": "https://git.kernel.org/stable/c/43403fe45379c64fa6276e5a8ede44493e5d2d3d"
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},
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{
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"url": "https://git.kernel.org/stable/c/29dc2f8e1c97372c2871a70088707933515fbd5b"
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}
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],
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"title": "RDMA/core: Fix potential use after free in ib_free_cq()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |