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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": "2025-08-19T17:03:56Z",
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          "date": "2026-08-25T12:53:50Z",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\neventpoll: Fix semi-unbounded recursion\n\nEnsure that epoll instances can never form a graph deeper than\nEP_MAX_NESTS+1 links.\n\nCurrently, ep_loop_check_proc() ensures that the graph is loop-free and\ndoes some recursion depth checks, but those recursion depth checks don't\nlimit the depth of the resulting tree for two reasons:\n\n - They don't look upwards in the tree.\n - If there are multiple downwards paths of different lengths, only one of\n   the paths is actually considered for the depth check since commit\n   28d82dc1c4ed (\"epoll: limit paths\").\n\nEssentially, the current recursion depth check in ep_loop_check_proc() just\nserves to prevent it from recursing too deeply while checking for loops.\n\nA more thorough check is done in reverse_path_check() after the new graph\nedge has already been created; this checks, among other things, that no\npaths going upwards from any non-epoll file with a length of more than 5\nedges exist. However, this check does not apply to non-epoll files.\n\nAs a result, it is possible to recurse to a depth of at least roughly 500,\ntested on v6.15. (I am unsure if deeper recursion is possible; and this may\nhave changed with commit 8c44dac8add7 (\"eventpoll: Fix priority inversion\nproblem\").)\n\nTo fix it:\n\n1. In ep_loop_check_proc(), note the subtree depth of each visited node,\nand use subtree depths for the total depth calculation even when a subtree\nhas already been visited.\n2. Add ep_get_upwards_depth_proc() for similarly determining the maximum\ndepth of an upwards walk.\n3. In ep_loop_check(), use these values to limit the total path length\nbetween epoll nodes to EP_MAX_NESTS edges.",
          "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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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2025-38614"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/1b13b033062824495554e836a1ff5f85ccf6b039",
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        },
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          "category": "external",
          "summary": "https://git.kernel.org/stable/c/3542c90797bc3ab83ebab54b737d751cf3682036",
          "url": "https://git.kernel.org/stable/c/3542c90797bc3ab83ebab54b737d751cf3682036"
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          "category": "external",
          "summary": "https://git.kernel.org/stable/c/71379495ab70eaba19224bd71b5b9b399eb85e04",
          "url": "https://git.kernel.org/stable/c/71379495ab70eaba19224bd71b5b9b399eb85e04"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/7a2125962c42d5336ca0495a9ce4cb38a63e9161",
          "url": "https://git.kernel.org/stable/c/7a2125962c42d5336ca0495a9ce4cb38a63e9161"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/ea5f97dbdcb1651581a22bd10afd2f0dd9dc11d6",
          "url": "https://git.kernel.org/stable/c/ea5f97dbdcb1651581a22bd10afd2f0dd9dc11d6"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f2e467a48287c868818085aa35389a224d226732",
          "url": "https://git.kernel.org/stable/c/f2e467a48287c868818085aa35389a224d226732"
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        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
        }
      ],
      "release_date": "2025-08-19T17:03:56Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-06T12:25:40.783076Z",
          "details": "This flaw is a local-only availability issue in the kernel’s epoll subsystem that requires a process to deliberately create extremely deep, chained epoll graphs; it does not enable data access/modification or privilege escalation. Reaching the vulnerable condition demands unusual, non-default application behavior (epoll-on-epoll nesting on the order of hundreds of links), making practical exploitation unlikely in managed server/VM workloads. Given the DoS-only impact and the requirement for local code execution to craft such graphs, this CVE can be safely deprioritized.",
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            "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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