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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": "2026-04-13T14:16:00Z",
          "number": "1",
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    "title": "Security update on CVE-2026-31424"
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        "name": "NULL Pointer Dereference"
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          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP\n\nWeiming Shi says:\n\nxt_match and xt_target structs registered with NFPROTO_UNSPEC can be\nloaded by any protocol family through nft_compat. When such a\nmatch/target sets .hooks to restrict which hooks it may run on, the\nbitmask uses NF_INET_* constants. This is only correct for families\nwhose hook layout matches NF_INET_*: IPv4, IPv6, INET, and bridge\nall share the same five hooks (PRE_ROUTING ... POST_ROUTING).\n\nARP only has three hooks (IN=0, OUT=1, FORWARD=2) with different\nsemantics. Because NF_ARP_OUT == 1 == NF_INET_LOCAL_IN, the .hooks\nvalidation silently passes for the wrong reasons, allowing matches to\nrun on ARP chains where the hook assumptions (e.g. state->in being\nset on input hooks) do not hold. This leads to NULL pointer\ndereferences; xt_devgroup is one concrete example:\n\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000044: 0000 [#1] SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000220-0x0000000000000227]\n RIP: 0010:devgroup_mt+0xff/0x350\n Call Trace:\n  <TASK>\n  nft_match_eval (net/netfilter/nft_compat.c:407)\n  nft_do_chain (net/netfilter/nf_tables_core.c:285)\n  nft_do_chain_arp (net/netfilter/nft_chain_filter.c:61)\n  nf_hook_slow (net/netfilter/core.c:623)\n  arp_xmit (net/ipv4/arp.c:666)\n  </TASK>\n Kernel panic - not syncing: Fatal exception in interrupt\n\nFix it by restricting arptables to NFPROTO_ARP extensions only.\nNote that arptables-legacy only supports:\n\n- arpt_CLASSIFY\n- arpt_mangle\n- arpt_MARK\n\nthat provide explicit NFPROTO_ARP match/target declarations.",
          "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-2026-31424"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/1cd6313c8644bfebbd813a05da9daa21b09dd68c",
          "url": "https://git.kernel.org/stable/c/1cd6313c8644bfebbd813a05da9daa21b09dd68c"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/3d5d488f11776738deab9da336038add95d342d1",
          "url": "https://git.kernel.org/stable/c/3d5d488f11776738deab9da336038add95d342d1"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/3e79374b03bf9a2f282f0eb1d0ac3776f7e0f28a",
          "url": "https://git.kernel.org/stable/c/3e79374b03bf9a2f282f0eb1d0ac3776f7e0f28a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/80e3c75f71c3ea1e62fcb032382de13e00a68f8b",
          "url": "https://git.kernel.org/stable/c/80e3c75f71c3ea1e62fcb032382de13e00a68f8b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/d9a0af9e43416aa50c0595e15fa01365a1c72c49",
          "url": "https://git.kernel.org/stable/c/d9a0af9e43416aa50c0595e15fa01365a1c72c49"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/dc3e27dd7d76e21106b8f9bbdc31f5da74a89014",
          "url": "https://git.kernel.org/stable/c/dc3e27dd7d76e21106b8f9bbdc31f5da74a89014"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/e7e1b6bcb389c8708003d40613a59ff2496f6b1f",
          "url": "https://git.kernel.org/stable/c/e7e1b6bcb389c8708003d40613a59ff2496f6b1f"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f00ac65c90ea475719e08d629e2e26c8b4e6999b",
          "url": "https://git.kernel.org/stable/c/f00ac65c90ea475719e08d629e2e26c8b4e6999b"
        },
        {
          "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-082556.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
        }
      ],
      "release_date": "2026-04-13T14:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-24T15:29:48.993258Z",
          "details": "This issue is a local-only denial of service that requires CAP_NET_ADMIN to install ARP nftables/arptables rules using the nft_compat path and a non-ARP xtables extension, which standard user accounts do not possess. ARP-family tables are not created by default and arptables-legacy exposes only ARP-specific targets, so reaching the vulnerable code path requires an explicit, non-default ARP ruleset configuration. With no confidentiality or integrity impact and administrative networking privileges needed to trigger it, this can be safely deprioritized in centrally managed VM/server environments.",
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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"
        }
      ]
    }
  ]
}