{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31417",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31417"
  ],
  "published": "2026-04-13T13:21:17Z",
  "summary": "net/x25: Fix overflow when accumulating packets",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/x25: Fix overflow when accumulating packets\n\nAdd a check to ensure that `x25_sock.fraglen` does not overflow.\n\nThe `fraglen` also needs to be resetted when purging `fragment_queue` in\n`x25_clear_queues()`.",
  "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": "6.1.168",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31417"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/96fc16370b0bceb289c7e0479bd0540b81e257aa"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/798d613afb64b01a203f448fb0f43c37c6afe79d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6e568835ea54a3e1d08e310e34f95d434e739477"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1734bd85c5e0a7a801295b729efb56b009cb8fc3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4e2d1bcef78d21247fe8fef13bc7ed95885df2b5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8c92969c197b91c134be27dc3afb64ab468853a9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f953f11ccf4afe6feb635c08145f4240d9a6b544"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a1822cb524e89b4cd2cf0b82e484a2335496a6d9"
    }
  ],
  "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 path is reached by received X.25 network packets delivered through the kernel `ETH_P_X25` packet handler on an X.25 link. A remote X.25 peer can establish or use a virtual circuit and send fragmented DATA packets to the affected host.\nAC:L - The attacker only needs to send valid sequenced DATA frames with the M bit set until the 16-bit fragment length wraps, then send a final fragment. There is no race or condition outside attacker control beyond ordinary X.25 connectivity.\nPR:N - For an exposed X.25 listener, the peer reaches this kernel receive path through Call Request and DATA frames without kernel-level authentication or local privileges. Route/device setup is administrative target configuration, not an attacker privilege requirement.\nUI:N - Once the vulnerable X.25 service/link is present, exploitation is driven entirely by attacker-supplied network frames. No victim user action is required.\nS:U - The vulnerability affects the kernel networking stack and impacts the same host security authority. It is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:N - The overflow leads to an undersized skb reassembly allocation, but the subsequent `skb_put()` bounds check triggers `skb_over_panic()` before an out-of-bounds copy occurs. I did not find a defensible kernel memory disclosure primitive from this path.\nI:N - The reachable failure mode is a checked skb overrun panic rather than an attacker-controlled write to kernel memory. I did not find a defensible integrity-impact primitive beyond denial of service.\nA:H - A remote peer can repeatedly trigger `skb_over_panic()`/`BUG()` during fragmented packet reassembly, causing a kernel oops or panic. This is a high availability impact."
    }
  }
}