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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": "2024-04-17T10:27:30Z",
          "number": "1",
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  "vulnerabilities": [
    {
      "cve": "CVE-2024-26870",
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102\n\nA call to listxattr() with a buffer size = 0 returns the actual\nsize of the buffer needed for a subsequent call. When size > 0,\nnfs4_listxattr() does not return an error because either\ngeneric_listxattr() or nfs4_listxattr_nfs4_label() consumes\nexactly all the bytes then size is 0 when calling\nnfs4_listxattr_nfs4_user() which then triggers the following\nkernel BUG:\n\n  [   99.403778] kernel BUG at mm/usercopy.c:102!\n  [   99.404063] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n  [   99.408463] CPU: 0 PID: 3310 Comm: python3 Not tainted 6.6.0-61.fc40.aarch64 #1\n  [   99.415827] Call trace:\n  [   99.415985]  usercopy_abort+0x70/0xa0\n  [   99.416227]  __check_heap_object+0x134/0x158\n  [   99.416505]  check_heap_object+0x150/0x188\n  [   99.416696]  __check_object_size.part.0+0x78/0x168\n  [   99.416886]  __check_object_size+0x28/0x40\n  [   99.417078]  listxattr+0x8c/0x120\n  [   99.417252]  path_listxattr+0x78/0xe0\n  [   99.417476]  __arm64_sys_listxattr+0x28/0x40\n  [   99.417723]  invoke_syscall+0x78/0x100\n  [   99.417929]  el0_svc_common.constprop.0+0x48/0xf0\n  [   99.418186]  do_el0_svc+0x24/0x38\n  [   99.418376]  el0_svc+0x3c/0x110\n  [   99.418554]  el0t_64_sync_handler+0x120/0x130\n  [   99.418788]  el0t_64_sync+0x194/0x198\n  [   99.418994] Code: aa0003e3 d000a3e0 91310000 97f49bdb (d4210000)\n\nIssue is reproduced when generic_listxattr() returns 'system.nfs4_acl',\nthus calling lisxattr() with size = 16 will trigger the bug.\n\nAdd check on nfs4_listxattr() to return ERANGE error when it is\ncalled with size > 0 and the return value is greater than size.",
          "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": [
          "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
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          "Debian-10:libbpf-dev-0:4.19.325-1.amd64",
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          "Debian-10:linux-support-4.19.0-28-0:4.19.325-1.all"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2024-26870"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/06e828b3f1b206de08ef520fc46a40b22e1869cb",
          "url": "https://git.kernel.org/stable/c/06e828b3f1b206de08ef520fc46a40b22e1869cb"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/23bfecb4d852751d5e403557dd500bb563313baf",
          "url": "https://git.kernel.org/stable/c/23bfecb4d852751d5e403557dd500bb563313baf"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/251a658bbfceafb4d58c76b77682c8bf7bcfad65",
          "url": "https://git.kernel.org/stable/c/251a658bbfceafb4d58c76b77682c8bf7bcfad65"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/4403438eaca6e91f02d272211c4d6b045092396b",
          "url": "https://git.kernel.org/stable/c/4403438eaca6e91f02d272211c4d6b045092396b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/79cdcc765969d23f4e3d6ea115660c3333498768",
          "url": "https://git.kernel.org/stable/c/79cdcc765969d23f4e3d6ea115660c3333498768"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/80365c9f96015bbf048fdd6c8705d3f8770132bf",
          "url": "https://git.kernel.org/stable/c/80365c9f96015bbf048fdd6c8705d3f8770132bf"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/9d52865ff28245fc2134da9f99baff603a24407a",
          "url": "https://git.kernel.org/stable/c/9d52865ff28245fc2134da9f99baff603a24407a"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
          "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
        }
      ],
      "release_date": "2024-04-17T10:27:30Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-06T12:23:56.752202Z",
          "details": "This is a local-only denial-of-service in the NFSv4.2 client path: an attacker must already be able to run code on the host and issue listxattr() against an active NFSv4.2-mounted path where the server exposes the system.nfs4_acl xattr with an undersized nonzero buffer. It has no confidentiality or integrity impact and does not provide privilege escalation; systems without NFSv4.2 client mounts are unaffected. Given these narrow preconditions and the purely availability-focused outcome, it can be safely deprioritized for centrally managed enterprise VM/server environments.",
          "product_ids": [
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            "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1.amd64",
            "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64",
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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"
          },
          "products": [
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}