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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        "summary": "Canonical URL",
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          "date": "2021-01-01T00:00:00Z",
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          "date": "2026-08-25T12:55:48Z",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Return CQE error if invalid lkey was supplied\n\nRXE is missing update of WQE status in LOCAL_WRITE failures.  This caused\nthe following kernel panic if someone sent an atomic operation with an\nexplicitly wrong lkey.\n\n[leonro@vm ~]$ mkt test\ntest_atomic_invalid_lkey (tests.test_atomic.AtomicTest) ...\n WARNING: CPU: 5 PID: 263 at drivers/infiniband/sw/rxe/rxe_comp.c:740 rxe_completer+0x1a6d/0x2e30 [rdma_rxe]\n Modules linked in: crc32_generic rdma_rxe ip6_udp_tunnel udp_tunnel rdma_ucm rdma_cm ib_umad ib_ipoib iw_cm ib_cm mlx5_ib ib_uverbs ib_core mlx5_core ptp pps_core\n CPU: 5 PID: 263 Comm: python3 Not tainted 5.13.0-rc1+ #2936\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n RIP: 0010:rxe_completer+0x1a6d/0x2e30 [rdma_rxe]\n Code: 03 0f 8e 65 0e 00 00 3b 93 10 06 00 00 0f 84 82 0a 00 00 4c 89 ff 4c 89 44 24 38 e8 2d 74 a9 e1 4c 8b 44 24 38 e9 1c f5 ff ff <0f> 0b e9 0c e8 ff ff b8 05 00 00 00 41 bf 05 00 00 00 e9 ab e7 ff\n RSP: 0018:ffff8880158af090 EFLAGS: 00010246\n RAX: 0000000000000000 RBX: ffff888016a78000 RCX: ffffffffa0cf1652\n RDX: 1ffff9200004b442 RSI: 0000000000000004 RDI: ffffc9000025a210\n RBP: dffffc0000000000 R08: 00000000ffffffea R09: ffff88801617740b\n R10: ffffed1002c2ee81 R11: 0000000000000007 R12: ffff88800f3b63e8\n R13: ffff888016a78008 R14: ffffc9000025a180 R15: 000000000000000c\n FS:  00007f88b622a740(0000) GS:ffff88806d540000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f88b5a1fa10 CR3: 000000000d848004 CR4: 0000000000370ea0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n  rxe_do_task+0x130/0x230 [rdma_rxe]\n  rxe_rcv+0xb11/0x1df0 [rdma_rxe]\n  rxe_loopback+0x157/0x1e0 [rdma_rxe]\n  rxe_responder+0x5532/0x7620 [rdma_rxe]\n  rxe_do_task+0x130/0x230 [rdma_rxe]\n  rxe_rcv+0x9c8/0x1df0 [rdma_rxe]\n  rxe_loopback+0x157/0x1e0 [rdma_rxe]\n  rxe_requester+0x1efd/0x58c0 [rdma_rxe]\n  rxe_do_task+0x130/0x230 [rdma_rxe]\n  rxe_post_send+0x998/0x1860 [rdma_rxe]\n  ib_uverbs_post_send+0xd5f/0x1220 [ib_uverbs]\n  ib_uverbs_write+0x847/0xc80 [ib_uverbs]\n  vfs_write+0x1c5/0x840\n  ksys_write+0x176/0x1d0\n  do_syscall_64+0x3f/0x80\n  entry_SYSCALL_64_after_hwframe+0x44/0xae",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "known_affected": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-47076"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/a81e72d49b0648f68ab201163dbfc7841056d7a2",
          "url": "https://git.kernel.org/stable/c/a81e72d49b0648f68ab201163dbfc7841056d7a2"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/abe31d25facdb9109fe2cf69890748295291570c",
          "url": "https://git.kernel.org/stable/c/abe31d25facdb9109fe2cf69890748295291570c"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/dc07628bd2bbc1da768e265192c28ebd301f509d",
          "url": "https://git.kernel.org/stable/c/dc07628bd2bbc1da768e265192c28ebd301f509d"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
        }
      ],
      "release_date": "2024-03-01T22:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-22T14:52:01.281787Z",
          "details": "- This issue only applies when the optional Soft‑RoCE (rdma_rxe) driver is loaded and an RXE device is explicitly configured; on systems without Soft‑RoCE enabled, the vulnerable code path is not reachable.  \n- Even where RXE is present, exploitation is local-only and requires a user with RDMA verbs access to post a crafted atomic operation using an invalid lkey, providing no remote vector or privilege escalation.  \n- The impact is limited to a kernel panic (availability only) with no confidentiality or integrity effect, making it a low‑priority concern for centrally managed enterprise VMs and servers.",
          "product_ids": [
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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}