247 lines
13 KiB
JSON
247 lines
13 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-2026-46114",
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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": "2026-05-13T15:03:33.098Z",
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"datePublished": "2026-05-28T09:35:24.638Z",
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"dateUpdated": "2026-10-19T19:26:44.201Z"
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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": "2026-08-05T12:29:46.194Z"
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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 non-8-byte ATOMIC_WRITE payloads\n\natomic_write_reply() at drivers/infiniband/sw/rxe/rxe_resp.c\nunconditionally dereferences 8 bytes at payload_addr(pkt):\n\n value = *(u64 *)payload_addr(pkt);\n\ncheck_rkey() previously accepted an ATOMIC_WRITE request with pktlen ==\nresid == 0 because the length validation only compared pktlen against\nresid. A remote initiator that sets the RETH length to 0 therefore reaches\natomic_write_reply() with a zero-byte logical payload, and the responder\nreads sizeof(u64) bytes from past the logical end of the packet into\nskb->head tailroom, then writes those 8 bytes into the attacker's MR via\nrxe_mr_do_atomic_write(). That is a remote disclosure of 4 bytes of kernel\ntailroom per probe (the other 4 bytes are the packet's own trailing ICRC).\n\nIBA oA19-28 defines ATOMIC_WRITE as exactly 8 bytes. Anything else is\nprotocol-invalid. Hoist a strict length check into check_rkey() so the\nresponder never reaches the unchecked dereference, and keep the existing\nWRITE-family length logic for the normal RDMA WRITE path.\n\nReproduced on mainline with an unmodified rxe driver: a sustained\nzero-length ATOMIC_WRITE probe repeatedly leaks adjacent skb head-buffer\nbytes into the attacker's MR, including recognisable kernel strings and\npartial kernel-direct-map pointer words. With this patch applied the\nresponder rejects the PDU and the MR stays all-zero."
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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:H/I:N/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 - The rxe (Soft RoCE) responder processes RoCE v2 packets received over UDP/IP (port 4791) via rxe_udp_encap_recv(); a remote initiator crafts the malformed zero-length ATOMIC_WRITE PDU, so the vulnerable code is reachable across an L3-routable network.\nAC:L - A single protocol-valid-but-zero-length ATOMIC_WRITE packet deterministically reaches the unchecked 8-byte dereference; there is no race and no memory layout the attacker must win, making triggering fully reliable.\nPR:N - The attacker is a remote RDMA peer with no operating-system credentials on the target; completing the normal RC connection and using an advertised rkey is analogous to a network handshake, not OS privileges, so the worst-case network-facing RDMA service requires no privileges.\nUI:N - The responder processes the incoming packet automatically as part of normal QP servicing; no action by any local user or victim is required.\nS:U - The disclosed kernel memory is written into a memory region within the same kernel/RDMA security authority; no privilege or trust boundary (VM, IOMMU, sandbox) is crossed.\nC:H - Each probe leaks 4 bytes of adjacent kernel slab (skb head tailroom) into the attacker's MR, and the probe is repeatable indefinitely, streaming out kernel strings and partial direct-map pointer words — a serious, KASLR-defeating kernel memory disclosure, not a single strictly bounded read.\nI:N - The 8-byte write targets the attacker's own MR within a range validated by mr_check_range(); no kernel structure or out-of-bounds region is modified, so there is no integrity impact on the target.\nA:N - The 8-byte over-read stays within the allocated skb head buffer (tailroom) and the write stays within the validated MR, so the operation completes cleanly with no oops, panic, or hang — the author reproduced it as a clean leak, not a crash."
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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_resp.c"
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],
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"versions": [
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{
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"version": "034e285f8b99062a0cf29112e1232154a6a44aa5",
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"lessThan": "539cabb7b2d8ba70f55bba91db55faef11c2a6d7",
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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": "034e285f8b99062a0cf29112e1232154a6a44aa5",
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"lessThan": "d415fce3fcde6d7aeea6c25362a395b905811452",
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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": "034e285f8b99062a0cf29112e1232154a6a44aa5",
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"lessThan": "105bf79a23b85cf3a761d18a4f3e10ce88526bc1",
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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": "034e285f8b99062a0cf29112e1232154a6a44aa5",
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"lessThan": "7ec1ed4747f5f99f8b797bb438c5efd36079fad5",
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"status": "affected",
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},
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{
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"lessThan": "1114c87aa6f195cf07da55a27b2122ae26557b26",
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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/sw/rxe/rxe_resp.c"
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],
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"versions": [
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{
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"version": "6.2",
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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": "6.2",
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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": "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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{
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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": "6.2",
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"versionEndExcluding": "6.6.140"
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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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"versionEndExcluding": "7.0.7"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.2",
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"versionEndExcluding": "7.1"
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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/539cabb7b2d8ba70f55bba91db55faef11c2a6d7"
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},
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{
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"url": "https://git.kernel.org/stable/c/d415fce3fcde6d7aeea6c25362a395b905811452"
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},
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{
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"url": "https://git.kernel.org/stable/c/105bf79a23b85cf3a761d18a4f3e10ce88526bc1"
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},
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{
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"url": "https://git.kernel.org/stable/c/7ec1ed4747f5f99f8b797bb438c5efd36079fad5"
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},
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{
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"url": "https://git.kernel.org/stable/c/1114c87aa6f195cf07da55a27b2122ae26557b26"
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}
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],
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"title": "RDMA/rxe: Reject non-8-byte ATOMIC_WRITE payloads",
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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-2026-46114",
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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": "2026-10-16T15:19:49.222043Z"
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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": "2026-10-19T19:26:44.201Z"
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}
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}
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]
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}
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} |