298 lines
16 KiB
JSON
298 lines
16 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-2026-74584",
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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": "2026-08-15T05:44:03.918Z",
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"datePublished": "2026-08-22T14:28:07.988Z",
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"dateUpdated": "2026-10-16T19:05:58.544Z"
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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": "2026-08-25T05:40:11.315Z"
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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/bnxt_re: zero shared page before exposing to userspace\n\nbnxt_re_alloc_ucontext() allocates uctx->shpg via\n__get_free_page(GFP_KERNEL). The buddy allocator does not zero pages\nwithout __GFP_ZERO, so the page contains stale kernel data from\nwhatever object most recently freed it.\n\nThe page is then mapped into userspace via vm_insert_page() under\nBNXT_RE_MMAP_SH_PAGE in bnxt_re_mmap(). The driver only ever writes\n4 bytes (a u32 AVID) at offset BNXT_RE_AVID_OFFT (0x10) inside\nbnxt_re_create_ah(); the remaining 4092 bytes of the page are exposed\nto userspace unsanitised, leaking kernel memory contents.\n\nAny user with access to /dev/infiniband/uverbsX on a host with a\nbnxt_re device (typically rdma group membership) can read this data\nvia a single mmap() at pgoff 0 after IB_USER_VERBS_CMD_GET_CONTEXT.\n\nOther shared pages in the same file already use get_zeroed_page()\ncorrectly:\n\n drivers/infiniband/hw/bnxt_re/ib_verbs.c\n srq->uctx_srq_page = (void *)get_zeroed_page(GFP_KERNEL);\n cq->uctx_cq_page = (void *)get_zeroed_page(GFP_KERNEL);\n\nuctx->shpg is the only outlier. Bring it in line with the existing\nconvention by switching to get_zeroed_page()."
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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:N/UI:N/S:C/C:H/I:N/A:N",
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"baseScore": 7.1,
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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 leak is triggered only through local access to /dev/infiniband/uverbs* via ioctl GET_CONTEXT and mmap(pgoff 0); bnxt_re_mmap maps the shared page with vm_insert_page, and remote RoCE/IB packet handling never reaches this uverbs allocation path.\nAC:L - On a host with bnxt_re loaded, opening uverbs, issuing GET_CONTEXT, and mmap at offset 0 deterministically exposes the unstale page; the attacker controls all syscall parameters and needs no race, special memory layout, or victim-specific state.\nPR:N - Kernel uverbs character devices are created world-accessible (mode 0666) via uverbs_devnode, and ib_uverbs_open performs no capability or root check beyond netns access, so any local process can open the device and allocate a bnxt_re ucontext.\nUI:N - Exploitation requires only attacker-driven open/ioctl/mmap/read syscalls on their own uverbs file descriptor; no cooperative victim action such as mounting filesystems, opening files, or clicking links is needed.\nS:C - On HPC/cloud hosts exposing bnxt_re to tenant containers or shared RDMA workloads, mmap of unstale host-kernel buddy pages leaks host kernel memory across the container/tenant security boundary into an unprivileged workload's address space.\nC:H - __get_free_page without __GFP_ZERO leaves up to 4092 bytes of stale kernel heap/slack data readable per ucontext; repeated opens yield additional pages, disclosing kernel pointers, structures, and other sensitive material beyond a few-byte bounded leak.\nI:N - The flaw only exposes existing kernel memory contents to userspace via mmap; it does not corrupt, overwrite, or modify kernel objects, grant write primitives, or enable code execution through the shared page mapping.\nA:N - Reading the unstale mapped page does not trigger kernel oops, panic, hang, or resource exhaustion; the vulnerable path completes normally and availability is unaffected aside from normal per-context page allocation."
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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/hw/bnxt_re/ib_verbs.c"
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],
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"versions": [
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{
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"version": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
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"lessThan": "53c97e9882f4e747b4ac31b211317c2eba541af9",
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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": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
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"lessThan": "9896bdfd21d918e9f26a52bc6109cc77970ee0b1",
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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": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
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"lessThan": "9128c2411b83a64c0a69d2ff059c741bde25a9cc",
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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": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
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"lessThan": "c19b360fa10c521c0b681875cdaa51545d45a491",
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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": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
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"lessThan": "a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1",
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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": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
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"lessThan": "e2b143df29003d2704b51f62e9297006953dbacb",
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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": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
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"lessThan": "c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a",
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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": "1ac5a404797523cedaf424a3aaa3cf8f9548dff8",
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"lessThan": "f6b079629becfa977f9c51fe53ad2e6dcc55ef44",
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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/infiniband/hw/bnxt_re/ib_verbs.c"
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],
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"versions": [
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{
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"version": "4.11",
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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": "4.11",
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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": "5.10.260",
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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": "5.15.211",
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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": "6.1.177",
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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": "6.6.144",
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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": "6.12.95",
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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": "6.18.37",
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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": "7.0.14",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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": "4.11",
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"versionEndExcluding": "5.10.260"
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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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}
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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/53c97e9882f4e747b4ac31b211317c2eba541af9"
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},
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{
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"url": "https://git.kernel.org/stable/c/9896bdfd21d918e9f26a52bc6109cc77970ee0b1"
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},
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{
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"url": "https://git.kernel.org/stable/c/9128c2411b83a64c0a69d2ff059c741bde25a9cc"
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},
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{
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"url": "https://git.kernel.org/stable/c/c19b360fa10c521c0b681875cdaa51545d45a491"
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},
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{
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"url": "https://git.kernel.org/stable/c/a3ed2daab02b2a706e882ad31b5c3c4f33cb5bb1"
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},
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{
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"url": "https://git.kernel.org/stable/c/e2b143df29003d2704b51f62e9297006953dbacb"
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},
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{
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"url": "https://git.kernel.org/stable/c/c75f8ce4baa29ae57fe615c6a2c5101f59b8b89a"
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},
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{
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"url": "https://git.kernel.org/stable/c/f6b079629becfa977f9c51fe53ad2e6dcc55ef44"
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}
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],
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"title": "RDMA/bnxt_re: zero shared page before exposing to userspace",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74584",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:01:20.354025Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:05:58.544Z"
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}
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}
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]
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}
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} |