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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.",
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        "summary": "Canonical URL",
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          "date": "2026-06-25T08:38:52Z",
          "number": "1",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN\n\nIn drivers/infiniband/ulp/isert/ib_isert.c, isert_login_recv_done()\ncomputes the login request payload length as wc->byte_len minus\nISER_HEADERS_LEN with no lower bound, and login_req_len is a signed int.\nA remote iSER initiator can post a login Send work request carrying\nfewer than ISER_HEADERS_LEN (76) bytes, so the subtraction underflows\nand login_req_len becomes negative.\n\nisert_rx_login_req() then reads that negative length back into a signed\nint, takes size = min(rx_buflen, MAX_KEY_VALUE_PAIRS), and because the\nmin() is signed it keeps the negative value; the value is then passed as\nthe memcpy() length and sign-extended to a multi-gigabyte size_t. The\ncopy into the 8192-byte login->req_buf runs far out of bounds and\nfaults, crashing the target node. The login phase precedes iSCSI\nauthentication, so no credentials are required to reach this path.\n\nReject any login PDU shorter than ISER_HEADERS_LEN before the\nsubtraction, mirroring the existing early return on a failed work\ncompletion, so login_req_len can never go negative. The upper bound was\nalready safe: a posted login buffer cannot deliver more than\nISER_RX_PAYLOAD_SIZE, so the difference stays at or below\nMAX_KEY_VALUE_PAIRS and the existing min() clamps it; only the missing\nlower bound needs to be added.",
          "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"
        }
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-53176"
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        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93e",
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          "summary": "https://git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb",
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          "summary": "https://git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548",
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        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47",
          "url": "https://git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47"
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        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260",
          "url": "https://git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260"
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        {
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          "summary": "https://git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a",
          "url": "https://git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/cve/CVE-2026-53176",
          "url": "https://access.redhat.com/security/cve/CVE-2026-53176"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2492741",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492741"
        },
        {
          "category": "external",
          "summary": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53176.json",
          "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53176.json"
        }
      ],
      "release_date": "2026-06-25T08:38:52Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-06T12:19:11.464560Z",
          "details": "- Exposure exists only when the Linux kernel iSER target (ib_isert) is enabled and reachable over an RDMA-capable fabric (e.g., InfiniBand/RoCE); systems that do not run an iSER target or lack RDMA reachability are not affected.  \n- The vulnerability’s CVSS vector is adjacent network with availability-only impact (kernel crash) and no confidentiality or integrity loss, indicating a denial‑of‑service condition rather than code or data compromise.  \n- In centrally managed VM/server environments where RDMA access is explicitly provisioned to storage roles, the practical attack surface is narrow, so this issue can be safely deprioritized.",
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            "attackVector": "ADJACENT_NETWORK",
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            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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