{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-53559",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2023-53559"
  ],
  "published": "2025-10-04T15:17:41Z",
  "summary": "ip_vti: fix potential slab-use-after-free in decode_session6",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nip_vti: fix potential slab-use-after-free in decode_session6\n\nWhen ip_vti device is set to the qdisc of the sfb type, the cb field\nof the sent skb may be modified during enqueuing. Then,\nslab-use-after-free may occur when ip_vti device sends IPv6 packets.\nAs commit f855691975bb (\"xfrm6: Fix the nexthdr offset in\n_decode_session6.\") showed, xfrm_decode_session was originally intended\nonly for the receive path. IP6CB(skb)->nhoff is not set during\ntransmission. Therefore, set the cb field in the skb to 0 before\nsending packets.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.21-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v6",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v8",
            "binary_version": "1:6.1.21-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.21-1+rpt1": {
            "linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed",
            "upstream_version": "6.1.21",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.47"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-53559"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/82fb41c5de243e7dfa90f32ca58e35adaff56c1d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7dfe23659f3677c08a60a0056cda2d91a79c15ca"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d34c30442d5e53a33cde79ca163320dbe2432cbd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0b4d69539fdea138af2befe08893850c89248068"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e1e04cc2ef2c0c0866c19f5627149a76c2baae32"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2b05bf5dc437f7891dd409a3eaf5058459391c7a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/78e397a43e1c47321a4679cc49a6c4530bf820b9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6018a266279b1a75143c7c0804dd08a5fc4c3e0b"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:24:39Z"
  }
}