310 lines
17 KiB
JSON
310 lines
17 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-2026-46133",
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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": "2026-05-13T15:03:33.099Z",
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"datePublished": "2026-05-28T09:35:47.819Z",
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"dateUpdated": "2026-10-19T19:36:51.685Z"
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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": "2026-08-05T12:29:57.097Z"
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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/rxe: Reject unknown opcodes before ICRC processing\n\nEven after applying commit 7244491dab34 (\"RDMA/rxe: Validate pad and ICRC\nbefore payload_size() in rxe_rcv\"), a single unauthenticated UDP packet\ncan still trigger panic. That patch handled payload_size() underflow only\nfor valid opcodes with short packets, not for packets carrying an unknown\nopcode. The unknown-opcode OOB read described below predates that commit\nand reaches back to the initial Soft RoCE driver.\n\nThe check added there reads\n\n pkt->paylen < header_size(pkt) + bth_pad(pkt) + RXE_ICRC_SIZE\n\nwhere header_size(pkt) expands to rxe_opcode[pkt->opcode].length. The\nrxe_opcode[] array has 256 entries but is only populated for defined IB\nopcodes; any other entry (for example opcode 0xff) is zero-initialized, so\nlength == 0 and the check degenerates to\n\n pkt->paylen < 0 + bth_pad(pkt) + RXE_ICRC_SIZE\n\nwhich does not constrain pkt->paylen enough. rxe_icrc_hdr() then computes\n\n rxe_opcode[pkt->opcode].length - RXE_BTH_BYTES\n\nwhich underflows when length == 0 and passes a huge value to rxe_crc32(),\ncausing an out-of-bounds read of the skb payload.\n\nReproduced on v7.0-rc7 with that fix applied, QEMU/KVM with\nCONFIG_RDMA_RXE=y and CONFIG_KASAN=y, after\n\n rdma link add rxe0 type rxe netdev eth0\n\nA single 48-byte UDP packet to port 4791 with BTH opcode=0xff and\nQPN=IB_MULTICAST_QPN triggers:\n\n BUG: KASAN: slab-out-of-bounds in crc32_le+0x115/0x170\n Read of size 1 at addr ...\n The buggy address is located 0 bytes to the right of\n allocated 704-byte region\n Call Trace:\n crc32_le+0x115/0x170\n rxe_icrc_hdr.isra.0+0x226/0x300\n rxe_icrc_check+0x13f/0x3a0\n rxe_rcv+0x6e1/0x16e0\n rxe_udp_encap_recv+0x20a/0x320\n udp_queue_rcv_one_skb+0x7ed/0x12c0\n\nSubsequent packets with the same shape fault on unmapped memory and panic\nthe kernel. The trigger requires only module load and \"rdma link add\"; no\nQP, no connection, and no authentication.\n\nFix this by rejecting packets whose opcode has no rxe_opcode[] entry,\ndetected via the zero mask or zero length, before any length arithmetic\nruns."
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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:N/A:H",
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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 - The vulnerable code processes RoCEv2 packets encapsulated in routable UDP/IP (port 4791); a remote attacker sends a single crafted UDP packet to the host running a Soft RoCE device, with no L2 adjacency required.\nAC:L - A single 48-byte packet with opcode 0xff and QPN=IB_MULTICAST_QPN deterministically triggers the underflowed length and OOB read; there is no race and no attacker-uncontrolled memory-layout dependency.\nPR:N - The OOB read occurs during ICRC validation before any QP lookup, connection, or credential check; the commit confirms it requires \"no QP, no connection, and no authentication.\"\nUI:N - Exploitation requires only that the attacker send a packet; no victim action is needed.\nS:U - The out-of-bounds read and resulting crash occur within the kernel's own security authority; no boundary (VM/IOMMU/sandbox) is crossed.\nC:N - The out-of-bounds bytes are fed into an internal CRC32 comparison and are never returned to or observable by the attacker, so no information is disclosed.\nI:N - The vulnerability is a read-only out-of-bounds access; no kernel memory is modified.\nA:H - The underflowed length drives crc32 across far out-of-bounds memory; subsequent packets fault on unmapped pages and panic the kernel, a reliable remote denial of service."
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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/sw/rxe/rxe_recv.c"
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],
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"versions": [
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{
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"lessThan": "318787fa7193bd79691f2ebce4e80cb6abd0faef",
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"status": "affected",
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{
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"status": "affected",
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},
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"lessThan": "e3dc3a2fb05f4ed49c7f20594c4c52350d032189",
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"status": "affected",
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},
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{
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"lessThan": "f8ee926431a7bbec2b10c1290664af2cb290b983",
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"status": "affected",
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},
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{
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"version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
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"lessThan": "006a3a5f75345c6a0dbf13fd3ee01406e93b6733",
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"status": "affected",
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},
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{
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"version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
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"lessThan": "6fa18025e5782afff91415fd5217b39c1e4837d7",
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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": "8700e3e7c4857d28ebaa824509934556da0b3e76",
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"lessThan": "4c6f86d85d03cdb33addce86aa69aa795ca6c47a",
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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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"drivers/infiniband/sw/rxe/rxe_recv.c"
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],
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"versions": [
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{
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"version": "4.8",
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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": "4.8",
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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": "5.10.258",
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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": "5.15.209",
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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": "6.1.175",
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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": "6.6.140",
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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": "6.12.88",
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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": "6.18.30",
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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": "7.0.7",
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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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"nodes": [
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"operator": "OR",
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/318787fa7193bd79691f2ebce4e80cb6abd0faef"
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"url": "https://git.kernel.org/stable/c/6a79b1ea0fcb2c998fda6a793050f66146e9cc42"
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{
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"url": "https://git.kernel.org/stable/c/599cfdf44c1701c581cd4a21f1e1e03f8dc3840b"
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},
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{
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"url": "https://git.kernel.org/stable/c/e3dc3a2fb05f4ed49c7f20594c4c52350d032189"
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},
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{
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"url": "https://git.kernel.org/stable/c/f8ee926431a7bbec2b10c1290664af2cb290b983"
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},
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{
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"url": "https://git.kernel.org/stable/c/006a3a5f75345c6a0dbf13fd3ee01406e93b6733"
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{
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"url": "https://git.kernel.org/stable/c/6fa18025e5782afff91415fd5217b39c1e4837d7"
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},
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{
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"url": "https://git.kernel.org/stable/c/4c6f86d85d03cdb33addce86aa69aa795ca6c47a"
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}
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],
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"title": "RDMA/rxe: Reject unknown opcodes before ICRC processing",
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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-2026-46133",
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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": "yes"
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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": "2026-10-16T15:20:11.447368Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-125",
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"description": "CWE-125 Out-of-bounds Read"
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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": "2026-10-19T19:36:51.685Z"
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}
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}
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]
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}
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} |