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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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          "date": "2025-05-20T16:15:00Z",
          "number": "1",
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          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/huge_memory: fix dereferencing invalid pmd migration entry\n\nWhen migrating a THP, concurrent access to the PMD migration entry during\na deferred split scan can lead to an invalid address access, as\nillustrated below.  To prevent this invalid access, it is necessary to\ncheck the PMD migration entry and return early.  In this context, there is\nno need to use pmd_to_swp_entry and pfn_swap_entry_to_page to verify the\nequality of the target folio.  Since the PMD migration entry is locked, it\ncannot be served as the target.\n\nMailing list discussion and explanation from Hugh Dickins: \"An anon_vma\nlookup points to a location which may contain the folio of interest, but\nmight instead contain another folio: and weeding out those other folios is\nprecisely what the \"folio != pmd_folio((*pmd)\" check (and the \"risk of\nreplacing the wrong folio\" comment a few lines above it) is for.\"\n\nBUG: unable to handle page fault for address: ffffea60001db008\nCPU: 0 UID: 0 PID: 2199114 Comm: tee Not tainted 6.14.0+ #4 NONE\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\nRIP: 0010:split_huge_pmd_locked+0x3b5/0x2b60\nCall Trace:\n<TASK>\ntry_to_migrate_one+0x28c/0x3730\nrmap_walk_anon+0x4f6/0x770\nunmap_folio+0x196/0x1f0\nsplit_huge_page_to_list_to_order+0x9f6/0x1560\ndeferred_split_scan+0xac5/0x12a0\nshrinker_debugfs_scan_write+0x376/0x470\nfull_proxy_write+0x15c/0x220\nvfs_write+0x2fc/0xcb0\nksys_write+0x146/0x250\ndo_syscall_64+0x6a/0x120\nentry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nThe bug is found by syzkaller on an internal kernel, then confirmed on\nupstream.",
          "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-2025-37958"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/22f6368768340260e862f35151d2e1c55cb1dc75",
          "url": "https://git.kernel.org/stable/c/22f6368768340260e862f35151d2e1c55cb1dc75"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/3977946f61cdba87b6b5aaf7d7094e96089583a5",
          "url": "https://git.kernel.org/stable/c/3977946f61cdba87b6b5aaf7d7094e96089583a5"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/6166c3cf405441f7147b322980144feb3cefc617",
          "url": "https://git.kernel.org/stable/c/6166c3cf405441f7147b322980144feb3cefc617"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/753f142f7ff7d2223a47105b61e1efd91587d711",
          "url": "https://git.kernel.org/stable/c/753f142f7ff7d2223a47105b61e1efd91587d711"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/9468afbda3fbfcec21ac8132364dff3dab945faf",
          "url": "https://git.kernel.org/stable/c/9468afbda3fbfcec21ac8132364dff3dab945faf"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/be6e843fc51a584672dfd9c4a6a24c8cb81d5fb7",
          "url": "https://git.kernel.org/stable/c/be6e843fc51a584672dfd9c4a6a24c8cb81d5fb7"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/ef5706bed97e240b4abf4233ceb03da7336bc775",
          "url": "https://git.kernel.org/stable/c/ef5706bed97e240b4abf4233ceb03da7336bc775"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/fbab262b0c8226c697af1851a424896ed47dedcc",
          "url": "https://git.kernel.org/stable/c/fbab262b0c8226c697af1851a424896ed47dedcc"
        },
        {
          "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"
        },
        {
          "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"
        }
      ],
      "release_date": "2025-05-20T16:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-01T16:06:48.678933Z",
          "details": "Deprioritize this issue because it is a local-only race in the THP PMD migration/split path that results in a kernel fault (availability impact only) with no confidentiality or integrity impact. Triggering it requires local code execution and hitting a narrow window while a THP is being migrated and concurrently split, which is difficult to reproduce reliably outside synthetic stress conditions and cannot be initiated over the network or across VM boundaries. In centrally managed VM/server deployments, this confines the risk to a potential self-DoS of the affected kernel instance rather than a broader compromise.",
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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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          "category": "impact",
          "details": "Moderate"
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}