{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43373",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43373"
  ],
  "published": "2026-05-08T14:22:57Z",
  "summary": "net: ncsi: fix skb leak in error paths",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ncsi: fix skb leak in error paths\n\nEarly return paths in NCSI RX and AEN handlers fail to release\nthe received skb, resulting in a memory leak.\n\nSpecifically, ncsi_aen_handler() returns on invalid AEN packets\nwithout consuming the skb. Similarly, ncsi_rcv_rsp() exits early\nwhen failing to resolve the NCSI device, response handler, or\nrequest, leaving the skb unfreed.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.167",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43373"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9891d7f4f1ede473c54b49776ae07755083eef06"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fef5aa6e3bcf3c8053307642663a63b7362d7552"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/81d6aee32f8f7bbc175c05dbf61f4430bfb88c4a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/59962588197863d0d746879f193905c0c6b3df49"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/553366c271479c0d571dd1bb5d1bcde4747fb82e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b70c4e5e711931cdd56e6e905737b72f1e649189"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/87138dde2d6937b12b967f28fe598a7d59000ae4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5c3398a54266541610c8d0a7082e654e9ff3e259"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The vulnerable handlers are reached through the kernel Ethernet receive path for ETH_P_NCSI frames on an NCSI-enabled network device. A remote peer capable of delivering NCSI frames to the management interface can trigger the bug with network packets.\nAC:L - Triggering only requires malformed or unmatched NCSI response/AEN packets that take deterministic early error paths. No race, timing, or hard-to-control system state is required.\nPR:N - The packet receive path performs no credential, capability, or authentication checks before entering ncsi_rcv_rsp() or ncsi_aen_handler(). Local NCSI netlink operations may require admin permission, but the vulnerable receive path does not.\nUI:N - No victim user action is needed. Packets are processed automatically by the network receive stack.\nS:U - The impact remains within the kernel and the affected NCSI/network device security authority. There is no VM, sandbox, IOMMU, or other cross-scope boundary crossing.\nC:N - The fixed bug is a missing kfree_skb()/consume_skb() on error paths, not an information disclosure. The leaked skb is not exposed back to the attacker.\nI:N - The bug does not corrupt memory or provide a write primitive. It only retains references to received skb objects that should have been freed.\nA:H - Each trigger leaks a received skb, and the attacker can repeat this indefinitely with malformed or unmatched NCSI packets. On plausible BMC/management-controller deployments this can exhaust kernel memory and deny service."
    }
  }
}