{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74724",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74724"
  ],
  "published": "2026-08-22T15:32:12Z",
  "summary": "ipvs: avoid out-of-bounds write in ip_vs_nat_icmp",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: avoid out-of-bounds write in ip_vs_nat_icmp\n\nSashiko warns that local attacker can modify the packet\nwhile it is processed by IPVS. Some places read the\nIP ihl field multiple times which can cause out-of-bounds\naccess. One such place is ip_vs_nat_icmp where we\ncan write after the validated area.\n\nFix it by providing ciph argument just like it is done for\nIPv6 and use ciph->len as offset to the embedded transport\nheader.\n\nModify some IPv4 header checks by reading the ihl field\nonly once.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74724"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3b8f79af0e98f27b932b0b416e9c52b692d31ff9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3c779b258c9c3c3567af68d4f45c2f751f35bd0e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/be65fa324640c7a95e30b146159a2be5cc73f22e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a69a4b3fff5814d079beff9a1e9d369994b2ed47"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/243d0187ec4c3837b9b0004f18d1068e46115760"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/646922a0379496154e8c8faca4f8e2fd9100cacc"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The OOB write in ip_vs_nat_icmp() requires a local process to change the embedded IPv4 ihl in skb frags between ip_vs_fill_iph_skb_icmp() validation and the NAT write; remote-only ICMP to IPVS netfilter hooks cannot perform that TOCTOU without local access to the packet buffer.\nAC:L - A local attacker controls both sides of the race by concurrently injecting ICMP errors with TCP/UDP/SCTP payloads matching an IPVS NAT connection and modifying the embedded header ihl in skb frags during softirq processing; no victim-specific state or uncontrollable heap layout is required.\nPR:L - Triggering requires a local account able to race skb frag modification (e.g., via raw/packet sockets with CAP_NET_RAW, obtainable in a user namespace) against IPVS ICMP NAT handling on a host where IPVS is already configured; no init-namespace root is needed.\nUI:N - No victim user interaction is required; exploitation is driven entirely by attacker-controlled local packet injection and concurrent frag modification while IPVS processes ICMP errors on NAT-mode connections through LOCAL_IN, LOCAL_OUT, or FORWARD hooks.\nS:U - The out-of-bounds write corrupts kernel skb memory on the IPVS load-balancer host within the same kernel security authority; it does not cross VM, container, or IOMMU boundaries into a separate security scope.\nC:H - Writing TCP/UDP/SCTP port fields and running ip_send_check() using a re-read inflated ihl corrupts skb data beyond the validated region; out-of-bounds kernel memory corruption is exploitable for information disclosure and heap layout control.\nI:H - The bug is an out-of-bounds write of 16-bit port values (and checksum updates over an attacker-inflated header length) past skb_ensure_writable()'s bound, enabling adjacent kernel memory corruption and potential control-flow hijacking on internet-facing IPVS NAT nodes.\nA:H - Corrupting skb header memory beyond the ensured writable area can cause kernel oops or panic during ICMP NAT mangling; a local attacker can repeatedly trigger the race on kube-proxy IPVS nodes and hardware load balancers running IPVS NAT mode."
    }
  }
}