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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": "2025-02-27T03:15:00Z",
          "number": "1",
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nteam: better TEAM_OPTION_TYPE_STRING validation\n\nsyzbot reported following splat [1]\n\nMake sure user-provided data contains one nul byte.\n\n[1]\n BUG: KMSAN: uninit-value in string_nocheck lib/vsprintf.c:633 [inline]\n BUG: KMSAN: uninit-value in string+0x3ec/0x5f0 lib/vsprintf.c:714\n  string_nocheck lib/vsprintf.c:633 [inline]\n  string+0x3ec/0x5f0 lib/vsprintf.c:714\n  vsnprintf+0xa5d/0x1960 lib/vsprintf.c:2843\n  __request_module+0x252/0x9f0 kernel/module/kmod.c:149\n  team_mode_get drivers/net/team/team_core.c:480 [inline]\n  team_change_mode drivers/net/team/team_core.c:607 [inline]\n  team_mode_option_set+0x437/0x970 drivers/net/team/team_core.c:1401\n  team_option_set drivers/net/team/team_core.c:375 [inline]\n  team_nl_options_set_doit+0x1339/0x1f90 drivers/net/team/team_core.c:2662\n  genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]\n  genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]\n  genl_rcv_msg+0x1214/0x12c0 net/netlink/genetlink.c:1210\n  netlink_rcv_skb+0x375/0x650 net/netlink/af_netlink.c:2543\n  genl_rcv+0x40/0x60 net/netlink/genetlink.c:1219\n  netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]\n  netlink_unicast+0xf52/0x1260 net/netlink/af_netlink.c:1348\n  netlink_sendmsg+0x10da/0x11e0 net/netlink/af_netlink.c:1892\n  sock_sendmsg_nosec net/socket.c:718 [inline]\n  __sock_sendmsg+0x30f/0x380 net/socket.c:733\n  ____sys_sendmsg+0x877/0xb60 net/socket.c:2573\n  ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2627\n  __sys_sendmsg net/socket.c:2659 [inline]\n  __do_sys_sendmsg net/socket.c:2664 [inline]\n  __se_sys_sendmsg net/socket.c:2662 [inline]\n  __x64_sys_sendmsg+0x212/0x3c0 net/socket.c:2662\n  x64_sys_call+0x2ed6/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:47\n  do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n  do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f",
          "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-2025-21787"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/4236bf4716589558cc0f3c3612642b2c2141b04e",
          "url": "https://git.kernel.org/stable/c/4236bf4716589558cc0f3c3612642b2c2141b04e"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/4512482e4805dd30bc77dec511f2a2edba5cb868",
          "url": "https://git.kernel.org/stable/c/4512482e4805dd30bc77dec511f2a2edba5cb868"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/5bef3ac184b5626ea62385d6b82a1992b89d7940",
          "url": "https://git.kernel.org/stable/c/5bef3ac184b5626ea62385d6b82a1992b89d7940"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/7c30483d0f6bdb2230e10e3e4be5167927eac7a0",
          "url": "https://git.kernel.org/stable/c/7c30483d0f6bdb2230e10e3e4be5167927eac7a0"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/7f5af50f3aa0af8cbef9fb76fffeed69e8143f59",
          "url": "https://git.kernel.org/stable/c/7f5af50f3aa0af8cbef9fb76fffeed69e8143f59"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/8401cade1918281177974b32c925afdce750d292",
          "url": "https://git.kernel.org/stable/c/8401cade1918281177974b32c925afdce750d292"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/d071a91fa614ecdf760c29f61f6a7bfb7df796d6",
          "url": "https://git.kernel.org/stable/c/d071a91fa614ecdf760c29f61f6a7bfb7df796d6"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f443687ad20c70320d1248f35f57bf46cac8df0a",
          "url": "https://git.kernel.org/stable/c/f443687ad20c70320d1248f35f57bf46cac8df0a"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
        },
        {
          "category": "external",
          "summary": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html",
          "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.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": "2025-02-27T03:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-01T16:11:31.083109Z",
          "details": "This is a local-only flaw in the Linux team driver’s option parsing that can at worst crash the kernel (availability impact) and does not affect confidentiality or integrity. Exploitation requires CAP_NET_ADMIN via the team generic netlink “options set” operation and an existing team device/module, making the path unreachable for unprivileged users or systems without team configured. In centrally managed server/VM environments where CAP_NET_ADMIN is limited to administrators, this does not provide an escalation path for regular users and can be safely deprioritized.",
          "product_ids": [
            "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64",
            "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"
        }
      ]
    }
  ]
}